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Quantum Simulation on a Photonic Chip

Deliverables

On-chip array of single-photon sources

The integration of single photon sources can provide a more scalable method for the generation of multi-photon states required for quantum simulations. We will develop a photonic chip that includes an array of single photon sources. The chip will be composed of a circuit to distribute light from the same pump laser to various spontaneous Four Wave Mixing waveguide sources and a frequency filtering stage.

Road map for quantum supremacy via Boson Sampling

The Boson Sampling problem suggests that some simple quantum optical systems produce outcomes that cannot be efficiently simulated by classical computation. Remarkably, the scale at which classical simulation is impossible with current technology may be achievable in the near term. We will produce a road map for experimentally demonstrating the superiority of a quantum machine over a classical machine for a computational task based on the Boson Sampling problem. The road map will reflect advances made in both theoretical issues - including validation of a Boson Sampling machine and the computational complexity of Boson Sampling variants with realistic experimental imperfections – as well as new experimental capabilities – including large coupled waveguide arrays, arrays of heralded photon sources, and efficient integrated photon detectors.

Polarization quantum walk on a chip

Although most optical quantum computing experiments rely on polarization-encoded qubits, the majority of standard integrated-optic devices are unable to deal with such qubits, because of fast relative phase or amplitude decoherence. We are replacing the standardly used dual-rail encoding (where a qubit is encoded in two spatial modes) by laser-written waveguides that allow the processing of polarization- and path-encoded qubits.

Cryogenic operation of waveguide circuits

Efficient superconducting single photon detectors operate at temperatures of a few K. Fibre coupling to these detectors loses the advantage of high efficiency when detecting many photons. We will explore the function of a more integrated approach and test the operation of key waveguide features at cryogenic temperatures.

Hierarchy of validation tests

Certifying that a Boson Sampling device is working as expected is crucial in a Boson Sampling experimental demonstration. To address this challenging problem we will investigate a tree-level hierarchy of validations tests. Several ideas that provide evidence that a Boson Sampling experiment is working correctly have been suggested. We will use the photon clouding effect and the cancellation effect Fourier interferometers to tests the quality of a Boson Sampling machine. Previous approaches provide a weaker certification guarantee. To reach the best certification quality we will adapt “computational certification” tools, such as interactive proofs or self-testing of quantum devices, to design certification protocols for Boson Sampling. Because the imperfection in a Boson Sampling test come from experimental noise, not from the action of a malicious agent, an intermediate approach that we will investigate consist in relaxing some of the assumption in “computational certification” to make the theoretical and experimental analysis easier while keeping most of its benefits.

2D quantum walk

Taking advantage of the unique 3D capability of femtosecond-laser-writing technology, we will produce optical circuits in three-dimensional layouts as a platform for 2D quantum walk experiments. We will demonstrate both 2D arrays of straight waveguides for continuous quantum walks and cascaded directional couplers branching in 3D for discrete quantum walk experiments. Characterization of these structures will be provided with coherent light and these devices will be subsequently used in final experiments with multiple quantum walkers in D1.4

Integration of SSPD and waveguide circuits

Superconducting single photon detectors (SSPD) will be fabricated directly onto waveguide circuit chips, to electrically readout the detection signals of single photons guided through said circuits. Two approaches will be pursued: 1) detector integration on glass waveguide circuits (CNR), 2) detector integration on SOI waveguides (USOTON, UBRIS). The aim is to target increased collection efficiency with evanescent mode overlap between the wave-guide and detector structures. As contingency plan, CNR will develop efficient nanowire SSPDs fiber-coupled to quantum photonic circuits. This will miniaturise the overall footprint of the photonic processor setup. This will enable the processor platform to utilise the fast response times of SSPDs and detection of single photons that are of visible-telecomm wavelengths.

Identification of noise effects on transport dynamics beyond classical dephasing model

The most common characterization of dephasing processes is done in terms of a classically fluctuating field (Orstein-Uhlenbeck). This generally yields to master equation formulations that provide an accurate description of the system’s dynamics in the high temperature limit. However, many decoherence sources fall outside this description and require for its understanding the consideration of non trivial spectral densities. Using a unitary transformation that allows us to map out a spin-boson configuration into a spin coupled to a semi-infinite chain of harmonic oscillators with nearest neighbor couplings, we will characterize those effects on the transport dynamics whose origin can be unambiguously traced back to deviations from the action of a stationary, Gaussian, and markovian decoherence.

Photon clouding

Photon clouding is a recently discovered phenomenon, related to but different from bosonic bunching, in which photons are found to cluster together in local groups of modes. This effect has been useful for verifying Boson Sampling and we will further explore this application of clouding by tuning optical circuits to implement random unitary operations and then retune to implement unitaries that exhibit clouding.

2nd periodic report

Periodic report referring to the 2nd period (M19-M36) consisting in a technical report with a summary and an overview of the project progress, and a financial report, including all financial statements and an explanation of the use of resources.

1st periodic report

Periodic report referring to the 1st period (M1-M18) consisting in a technical report with a summary and an overview of the project progress, and a financial report, including all financial statements and an explanation of the use of resources.

Simulation of small size quantum systems

Random-walk structures and non-trivial two-qubit gates will be used for obtaining insight into the quantum correlations of other quantum systems. The Bosonic nature of photons as well as the capability of preparing anti-symmetric entangled states will be exploited for simulating properties that are hard for classical computers when scaling up the number of particles.

Scatter-shot Boson Sampling with complex structure

Scatter-shot boson sampling allows large numbers of photons to be generated in a state useful for boson sampling algorithms, in a highly efficient fashion with respect to resources. We will apply this novel photon source to sample from graph structures implementable with photonic quantum walks. We will use complex circuitry to implement graphs of increasing levels of connectivity.

Final international workshop on photonics quantum simulation

A final international workshop on photonics quantum simulation to show case the QUCHIP achievements, disseminate the project results, and discuss these results in the wider community.

Scatter-shot Boson Sampling with simple structure

"The achievement of scatter-shot Boson Sampling will be carried out by several partners. The unitary evolution will be implemented via an integrated circuit while the generation of heralded single photon states and single photon detection will be achieved via bulk optics techniques. The ""simple"" implementation should be carried out with 3 photons, 10-15 modes, and 4-8 two-photon pair sources."

Multi-walker on multi-dimension

Observing a quantum walk of multiple indistinguishable particles on a multidimensional lattice graph constitutes a significant advance for experimental quantum information. We are developing guided-wave approaches for walks that use time-, space-, and polarization-encoding; each of these will contribute to achieving increasingly complex quantum walk systems. We will report on the design and operation of a system for studying the first multidimensional, multi-walker quantum walks.

Final report

Final report for the entire project consisting in a technical and a financial final reports. The technical report will include a summary of scientific and technological results, conclusions and socio-economic impact of the project; the financial report will include a summary of the financial statements and a certificate on the financial statements.

Polarization entangled source

Pairs of orthogonally polarized photons will be generated in two different periodically poled waveguides on LiNbO3 (PPLN) wafers and subsequently split on an integrated polarizing beam splitter (PBS) such that the photons of each pair emege on two different spatial modes with orthogonal polarizations. The superposition of the states generated by the two different sources results in the desired entangled state. In this scheme the quality of the entanglement depends on both the homogeneity of the two poled waveguides and the splitting ratio of the integrated polarizing beam splitter. The combination of these characteristics with the high brightness of our PPLN waveguides which reaches values of about 1.5 photons per microW at 1 MHz repetition rate, will result in a source of polarization entangled states whose brightness is 2 orders of magnitude higher than the available bulk sources.

Demonstration of noise assisted transport in a realistic waveguide array

Waveguide arrays have sufficient flexibility to allow for the investigation of the effects of different forms of noise and disorder on excitation transfer in different types of graphs. The interplay between the underlying coherent dynamics, which typically leads to the enhancement or the suppression of certain transport paths, and the incoherent phenomena due to environmental noise is thought to be crucial for the resilient performance of biomolecular networks in charge of distributing energy and transporting charge across mesoscopic regions in both plants and bacteria. It may also play a role in randomized algorithms in quantum computer science. We will investigate the impact of different forms of network structures and trapping to elucidate the conditions required for optimal transport performance for settings ranging from biology to random walks on graphs.

Complex 3D integrated structure

Reconfigurable devices will be fabricated by femtosecond laser writing with the addition of thermal shifters on the glass surface. In particular, a three-arm interferometer with variable phases in two of the three arms will be demonstrated. The capability of producing waveguides at variable depths into the glass will be exploited to reduce the cross-talk of the thermal shifters on different waveguides.

Video on project highlights

A video showing QUCHIP highlights will be developed, including a brief information about the project (name, funding scheme, participating institutions, project objectives, main results of the project, acknowledgment to EU, etc). The video will be targeted to a technical and non-technical audience and is intended for a large distribution (YouTube).

Popularization of scientific results

The impact of the achievements will be measured through publications in peer-reviewed high-quality journals such as Nature, Science, Physical Review Letters, New Journal of Physics and Physical Review. For outstanding research highlights, the press offices of the participating institutions will issue press releases and also liaise with the national media as well as YouTube and Wikipedia contributions. All participants will assist in preparing these press releases, i.e. writing of comprehensive and popular summaries of the research results. In addition our on-going results will be disseminated at national workshops and conferences and at international workshops and larger overseas conferences.

Logo and web

A QUCHIP logo will be designed to be graphically appealing and to include a reference to the project topic. A QUCHIP website will be developed both as a mean of public dissemination of the project results and an effective way to share information among the project partners. It includes public pages with information on the project and its results, and a restricted access area for internal information exchanges. Il will be regularly updated with project results by the QUCHIP project manager.

Wikipedia webpages, leaflets on goals

New wikipedia webpages developed by the project beneficiaries. The pages will be then regularly updated with the project results. Leaflets and/or brochures on the project targets and results, for distribution at events and posted on project website.

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Publications

Learning an unknown transformation via a genetic approach

Author(s): Nicolò Spagnolo, Enrico Maiorino, Chiara Vitelli, Marco Bentivegna, Andrea Crespi, Roberta Ramponi, Paolo Mataloni, Roberto Osellame, Fabio Sciarrino
Published in: Scientific Reports, Issue 7/1, 2017, ISSN 2045-2322
DOI: 10.1038/s41598-017-14680-7

Tracking the coherent generation of polaron pairs in conjugated polymers

Author(s): Antonietta De Sio, Filippo Troiani, Margherita Maiuri, Julien Réhault, Ephraim Sommer, James Lim, Susana F. Huelga, Martin B. Plenio, Carlo Andrea Rozzi, Giulio Cerullo, Elisa Molinari, Christoph Lienau
Published in: Nature Communications, Issue 7, 2016, Page(s) 13742, ISSN 2041-1723
DOI: 10.1038/ncomms13742

Photonic simulation of entanglement growth and engineering after a spin chain quench

Author(s): Ioannis Pitsios, Leonardo Banchi, Adil S. Rab, Marco Bentivegna, Debora Caprara, Andrea Crespi, Nicolò Spagnolo, Sougato Bose, Paolo Mataloni, Roberto Osellame, Fabio Sciarrino
Published in: Nature Communications, Issue 8/1, 2017, Page(s) 1-8, ISSN 2041-1723
DOI: 10.1038/s41467-017-01589-y

Quantum violation of an instrumental test

Author(s): Rafael Chaves, Gonzalo Carvacho, Iris Agresti, Valerio Di Giulio, Leandro Aolita, Sandro Giacomini, Fabio Sciarrino
Published in: Nature Physics, 2017, ISSN 1745-2473
DOI: 10.1038/s41567-017-0008-5

Experimental nonlocality-based network diagnostics of multipartite entangled states

Author(s): Mario A. Ciampini, Caterina Vigliar, Valeria Cimini, Stefano Paesani, Fabio Sciarrino, Andrea Crespi, Giacomo Corrielli, Roberto Osellame, Paolo Mataloni, Mauro Paternostro, Marco Barbieri
Published in: Scientific Reports, Issue 7/1, 2017, ISSN 2045-2322
DOI: 10.1038/s41598-017-17457-0

Large scale quantum walks by means of optical fiber cavities

Author(s): J Boutari, A Feizpour, S Barz, C Di Franco, M S Kim, W S Kolthammer, I A Walmsley
Published in: Journal of Optics, Issue 18/9, 2016, Page(s) 094007, ISSN 2040-8978
DOI: 10.1088/2040-8978/18/9/094007

Experimental statistical signature of many-body quantum interference

Author(s): Taira Giordani, Fulvio Flamini, Matteo Pompili, Niko Viggianiello, Nicolò Spagnolo, Andrea Crespi, Roberto Osellame, Nathan Wiebe, Mattia Walschaers, Andreas Buchleitner, Fabio Sciarrino
Published in: Nature Photonics, 2018, ISSN 1749-4885
DOI: 10.1038/s41566-018-0097-4

Experimental generalized quantum suppression law in Sylvester interferometers

Author(s): Niko Viggianiello, Fulvio Flamini, Luca Innocenti, Daniele Cozzolino, Marco Bentivegna, Nicolò Spagnolo, Andrea Crespi, Daniel J. Brod, Ernesto F. Galvao, Roberto Osellame, Fabio Sciarrino
Published in: New Journal of Physics, 2018, ISSN 1367-2630
DOI: 10.1088/1367-2630/aaad92

Generalized Quantum Fast Transformations via Femtosecond Laser Writing Technique

Author(s): Fulvio FLAMINI, Niko VIGGIANIELLO, Marco BENTIVEGNA, Nicolo SPAGNOLO, Paolo MATALONI, Andrea CRESPI, Roberta RAMPONI, Roberto OSELLAME, Fabio SCIARRINO
Published in: Interdisciplinary Information Sciences, Issue 23/1, 2017, Page(s) 115-118, ISSN 1340-9050
DOI: 10.4036/iis.2017.A.14

Optimal design for universal multiport interferometers

Author(s): William R. Clements, Peter C. Humphreys, Benjamin J. Metcalf, W. Steven Kolthammer, Ian A. Walsmley
Published in: Optica, Issue 3/12, 2016, Page(s) 1460, ISSN 2334-2536
DOI: 10.1364/OPTICA.3.001460

Tuning single-photon sources for telecom multi-photon experiments

Author(s): Chiara Greganti, Peter Schiansky, Irati Alonso Calafell, Lorenzo M. Procopio, Lee A. Rozema, Philip Walther
Published in: Optics Express, Issue 26/3, 2018, Page(s) 3286, ISSN 1094-4087
DOI: 10.1364/OE.26.003286

Direct dialling of Haar random unitary matrices

Author(s): Nicholas J Russell, Levon Chakhmakhchyan, Jeremy L O’Brien, Anthony Laing
Published in: New Journal of Physics, Issue 19/3, 2017, Page(s) 033007, ISSN 1367-2630
DOI: 10.1088/1367-2630/aa60ed

Ensemble inequivalence and absence of quasi-stationary states in long-range random networks

Author(s): L Chakhmakhchyan, T N Teles, S Ruffo
Published in: Journal of Statistical Mechanics: Theory and Experiment, Issue 2017/6, 2017, Page(s) 063204, ISSN 1742-5468
DOI: 10.1088/1742-5468/aa73f1

Boson sampling with Gaussian measurements

Author(s): L. Chakhmakhchyan, N. J. Cerf
Published in: Physical Review A, Issue 96/3, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.96.032326

Colloquium : Quantum coherence as a resource

Author(s): Alexander Streltsov, Gerardo Adesso, Martin B. Plenio
Published in: Reviews of Modern Physics, Issue 89/4, 2017, ISSN 0034-6861
DOI: 10.1103/RevModPhys.89.041003

Dissipative phase transition in the open quantum Rabi model

Author(s): Myung-Joong Hwang, Peter Rabl, Martin B. Plenio
Published in: Physical Review A, Issue 97/1, 2018, ISSN 2469-9926
DOI: 10.1103/PhysRevA.97.013825

Classical boson sampling algorithms with superior performance to near-term experiments

Author(s): Alex Neville, Chris Sparrow, Raphaël Clifford, Eric Johnston, Patrick M. Birchall, Ashley Montanaro, Anthony Laing
Published in: Nature Physics, Issue 13/12, 2017, Page(s) 1153-1157, ISSN 1745-2473
DOI: 10.1038/nphys4270

Complementary metal-oxide semiconductor compatible source of single photons at near-visible wavelengths

Author(s): Robert Cernansky, Francesco Martini, Alberto Politi
Published in: Optics Letters, Issue 43/4, 2018, Page(s) 855, ISSN 0146-9592
DOI: 10.1364/OL.43.000855

Gaussian optical Ising machines

Author(s): William R. Clements, Jelmer J. Renema, Y. Henry Wen, Helen M. Chrzanowski, W. Steven Kolthammer, Ian A. Walmsley
Published in: Physical Review A, Issue 96/4, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.96.043850

Integrated sources of entangled photons at the telecom wavelength in femtosecond-laser-written circuits

Author(s): Simone Atzeni, Adil S. Rab, Giacomo Corrielli, Emanuele Polino, Mauro Valeri, Paolo Mataloni, Nicolò Spagnolo, Andrea Crespi, Fabio Sciarrino, Roberto Osellame
Published in: Optica, Issue 5/3, 2018, Page(s) 311, ISSN 2334-2536
DOI: 10.1364/OPTICA.5.000311

Measuring topological invariants in disordered discrete-time quantum walks

Author(s): Sonja Barkhofen, Thomas Nitsche, Fabian Elster, Lennart Lorz, Aurél Gábris, Igor Jex, Christine Silberhorn
Published in: Physical Review A, Issue 96/3, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.96.033846

Integrated-optics heralded controlled-NOT gate for polarization-encoded qubits

Author(s): Jonas Zeuner, Aditya N. Sharma, Max Tillmann, René Heilmann, Markus Gräfe, Amir Moqanaki, Alexander Szameit, Philip Walther
Published in: npj Quantum Information, Issue 4/1, 2018, ISSN 2056-6387
DOI: 10.1038/s41534-018-0068-0

Experimental Bayesian Quantum Phase Estimation on a Silicon Photonic Chip

Author(s): S. Paesani, A. A. Gentile, R. Santagati, J. Wang, N. Wiebe, D. P. Tew, J. L. O’Brien, M. G. Thompson
Published in: Physical Review Letters, Issue 118/10, 2017, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.118.100503

Gaussian Boson Sampling

Author(s): Craig S. Hamilton, Regina Kruse, Linda Sansoni, Sonja Barkhofen, Christine Silberhorn, Igor Jex
Published in: Physical Review Letters, Issue 119/17, 2017, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.119.170501

Experimental quantum Hamiltonian learning

Author(s): Jianwei Wang, Stefano Paesani, Raffaele Santagati, Sebastian Knauer, Antonio A. Gentile, Nathan Wiebe, Maurangelo Petruzzella, Jeremy L. O’Brien, John G. Rarity, Anthony Laing, Mark G. Thompson
Published in: Nature Physics, Issue 13/6, 2017, Page(s) 551-555, ISSN 1745-2473
DOI: 10.1038/nphys4074

Quantum-inspired algorithm for estimating the permanent of positive semidefinite matrices

Author(s): L. Chakhmakhchyan, N. J. Cerf, R. Garcia-Patron
Published in: Physical Review A, Issue 96/2, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.96.022329

Proposal for Quantum Simulation via All-Optically-Generated Tensor Network States

Author(s): I. Dhand, M. Engelkemeier, L. Sansoni, S. Barkhofen, C. Silberhorn, M. B. Plenio
Published in: Physical Review Letters, Issue 120/13, 2018, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.120.130501

Witnessing eigenstates for quantum simulation of Hamiltonian spectra

Author(s): Raffaele Santagati, Jianwei Wang, Antonio A. Gentile, Stefano Paesani, Nathan Wiebe, Jarrod R. McClean, Sam Morley-Short, Peter J. Shadbolt, Damien Bonneau, Joshua W. Silverstone, David P. Tew, Xiaoqi Zhou, Jeremy L. O’Brien, Mark G. Thompson
Published in: Science Advances, Issue 4/1, 2018, Page(s) eaap9646, ISSN 2375-2548
DOI: 10.1126/sciadv.aap9646

Numerical Investigation of Photon-Pair Generation in Periodically Poled M TiO X O 4 (

Author(s): Fabian Laudenbach, Rui-Bo Jin, Chiara Greganti, Michael Hentschel, Philip Walther, Hannes Hübel
Published in: Physical Review Applied, Issue 8/2, 2017, ISSN 2331-7019
DOI: 10.1103/PhysRevApplied.8.024035

Single-Photon Quantum Contextuality on a Chip

Author(s): Andrea Crespi, Marco Bentivegna, Ioannis Pitsios, Davide Rusca, Davide Poderini, Gonzalo Carvacho, Vincenzo D’Ambrosio, Adán Cabello, Fabio Sciarrino, Roberto Osellame
Published in: ACS Photonics, Issue 4/11, 2017, Page(s) 2807-2812, ISSN 2330-4022
DOI: 10.1021/acsphotonics.7b00793

Nonperturbative Treatment of non-Markovian Dynamics of Open Quantum Systems

Author(s): D. Tamascelli, A. Smirne, S. F. Huelga, M. B. Plenio
Published in: Physical Review Letters, Issue 120/3, 2018, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.120.030402

Tapering of femtosecond laser-written waveguides

Author(s): René Heilmann, Chiara Greganti, Markus Gräfe, Stefan Nolte, Philip Walther, Alexander Szameit
Published in: Applied Optics, Issue 57/3, 2018, Page(s) 377, ISSN 1559-128X
DOI: 10.1364/AO.57.000377

Silicon photonic processor of two-qubit entangling quantum logic

Author(s): R Santagati, J W Silverstone, M J Strain, M Sorel, S Miki, T Yamashita, M Fujiwara, M Sasaki, H Terai, M G Tanner, C M Natarajan, R H Hadfield, J L O’Brien, M G Thompson
Published in: Journal of Optics, Issue 19/11, 2017, Page(s) 114006, ISSN 2040-8978
DOI: 10.1088/2040-8986/aa8d56

Open Systems with Error Bounds: Spin-Boson Model with Spectral Density Variations

Author(s): F. Mascherpa, A. Smirne, S. F. Huelga, M. B. Plenio
Published in: Physical Review Letters, Issue 118/10, 2017, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.118.100401

Resource Theory of Superposition

Author(s): T. Theurer, N. Killoran, D. Egloff, M. B. Plenio
Published in: Physical Review Letters, Issue 119/23, 2017, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.119.230401

Universal continuous-variable quantum computation without cooling

Author(s): Hoi-Kwan Lau, Martin B. Plenio
Published in: Physical Review A, Issue 95/2, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.95.022303

Momentum coupling in non-Markovian quantum Brownian motion

Author(s): Luca Ferialdi, Andrea Smirne
Published in: Physical Review A, Issue 96/1, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.96.012109

Signatures of spatially correlated noise and non-secular effects in two-dimensional electronic spectroscopy

Author(s): James Lim, David J. Ing, Joachim Rosskopf, Jan Jeske, Jared H. Cole, Susana F. Huelga, Martin B. Plenio
Published in: The Journal of Chemical Physics, Issue 146/2, 2017, Page(s) 024109, ISSN 0021-9606
DOI: 10.1063/1.4973975

Stochastic unraveling of positive quantum dynamics

Author(s): Matteo Caiaffa, Andrea Smirne, Angelo Bassi
Published in: Physical Review A, Issue 95/6, 2017, ISSN 2469-9926
DOI: 10.1103/PhysRevA.95.062101

Geometrically-controlled polarisation processing in femtosecond-laser-written photonic circuits

Author(s): Ioannis Pitsios, Farid Samara, Giacomo Corrielli, Andrea Crespi, Roberto Osellame
Published in: Scientific Reports, Issue 7/1, 2017, ISSN 2045-2322
DOI: 10.1038/s41598-017-09462-0

Coherent control of quantum systems as a resource theory

Author(s): J M Matera, D Egloff, N Killoran, M B Plenio
Published in: Quantum Science and Technology, Issue 1/1, 2016, Page(s) 01LT01, ISSN 2058-9565
DOI: 10.1088/2058-9565/1/1/01LT01

Experimental verification of an indefinite causal order

Author(s): Giulia Rubino, Lee A. Rozema, Adrien Feix, Mateus Araújo, Jonas M. Zeuner, Lorenzo M. Procopio, Časlav Brukner, Philip Walther
Published in: Science Advances, Issue 3/3, 2017, Page(s) e1602589, ISSN 2375-2548
DOI: 10.1126/sciadv.1602589

Suppression law of quantum states in a 3D photonic fast Fourier transform chip

Author(s): Andrea Crespi, Roberto Osellame, Roberta Ramponi, Marco Bentivegna, Fulvio Flamini, Nicolò Spagnolo, Niko Viggianiello, Luca Innocenti, Paolo Mataloni, Fabio Sciarrino
Published in: Nature Communications, Issue 7, 2016, Page(s) 10469, ISSN 2041-1723
DOI: 10.1038/ncomms10469

Driven Boson Sampling

Author(s): Sonja Barkhofen, Tim J. Bartley, Linda Sansoni, Regina Kruse, Craig S. Hamilton, Igor Jex, Christine Silberhorn
Published in: Physical Review Letters, Issue 118/2, 2017, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.118.020502

Benchmarking integrated linear-optical architectures for quantum information processing

Author(s): Fulvio Flamini, Nicolò Spagnolo, Niko Viggianiello, Andrea Crespi, Roberto Osellame, Fabio Sciarrino
Published in: Scientific Reports, Issue 7/1, 2017, ISSN 2045-2322
DOI: 10.1038/s41598-017-15174-2

Experimental scattershot boson sampling

Author(s): M. Bentivegna, N. Spagnolo, C. Vitelli, F. Flamini, N. Viggianiello, L. Latmiral, P. Mataloni, D. J. Brod, E. F. Galvao, A. Crespi, R. Ramponi, R. Osellame, F. Sciarrino
Published in: Science Advances, Issue 1/3, 2015, Page(s) e1400255-e1400255, ISSN 2375-2548
DOI: 10.1126/sciadv.1400255

Chip-based array of near-identical, pure, heralded single-photon sources

Author(s): Justin B. Spring, Paolo L. Mennea, Benjamin J. Metcalf, Peter C. Humphreys, James C. Gates, Helen L. Rogers, Christoph Söller, Brian J. Smith, W. Steven Kolthammer, Peter G. R. Smith, Ian A. Walmsley
Published in: Optica, Issue 4/1, 2017, Page(s) 90, ISSN 2334-2536
DOI: 10.1364/OPTICA.4.000090

A two-channel, spectrally degenerate polarization entangled source on chip

Author(s): Linda Sansoni, Kai Hong Luo, Christof Eigner, Raimund Ricken, Viktor Quiring, Harald Herrmann, Christine Silberhorn
Published in: npj Quantum Information, Issue 3/1, 2017, ISSN 2056-6387
DOI: 10.1038/s41534-016-0005-z

A novel single-crystal & single-pass source for polarisation- and colour-entangled photon pairs

Author(s): Fabian Laudenbach, Sebastian Kalista, Michael Hentschel, Philip Walther, Hannes Hübel
Published in: Scientific Reports, Issue 7/1, 2017, ISSN 2045-2322
DOI: 10.1038/s41598-017-07781-w

Multidimensional quantum entanglement with large-scale integrated optics

Author(s): J. Wang, S. Paesani, Y. Ding, R. Santagati, P. Skrzypczyk, A. Salavrakos, J. Tura, R. Augusiak, L. Mančinska, D. Bacco, D. Bonneau, J.W. Silverstone, Q. Gong, A. Acín, K. Rottwitt, L.K. Oxenløwe, J.L. O'Brien, A. Laing, M.G. Thompson
Published in: Science, Issue 2018 Mar 8. pii: eaar7053, 2018, ISSN 1095-9203
DOI: 10.1126/science.aar7053

Non-additive dissipation in open quantum networks out of equilibrium

Author(s): M. T. Mitchison and M. B. Plenio
Published in: New Journal of Physics, Issue 20, 033005, 2018, ISSN 1367-2630
DOI: 10.1088/1367-2630/aa9f70/meta

Dual-path source engineering in integrated quantum optics

Author(s): Regina Kruse, Linda Sansoni, Sebastian Brauner, Raimund Ricken, Craig S. Hamilton, Igor Jex, Christine Silberhorn
Published in: Physical Review A, Issue 92/5, 2015, ISSN 1094-1622
DOI: 10.1103/PhysRevA.92.053841

Fundamental limits to frequency estimation: a comprehensive microscopic perspective

Author(s): Jan Friedrich Haase, Andrea Smirne, Jan Kolodynski, Rafał Demkowicz-Dobrzański, Susana F Huelga
Published in: New Journal of Physics, 2018, ISSN 1367-2630
DOI: 10.1088/1367-2630/aab67f

Simulating the vibrational quantum dynamics of molecules using photonics

Author(s): Chris Sparrow, Enrique Martín-López, Nicola Maraviglia, Alex Neville, Christopher Harrold, Jacques Carolan, Yogesh N. Joglekar, Toshikazu Hashimoto, Nobuyuki Matsuda, Jeremy L. O’Brien, David P. Tew, Anthony Laing
Published in: Nature, Issue 557/7707, 2018, Page(s) 660-667, ISSN 0028-0836
DOI: 10.1038/s41586-018-0152-9

Modelling parametric down-conversion yielding spectrally pure photon pairs

Author(s): Fabian Laudenbach, Hannes Hübel, Michael Hentschel, Philip Walther, Andreas Poppe
Published in: Optics Express, Issue 24/3, 2016, Page(s) 2712, ISSN 1094-4087
DOI: 10.1364/OE.24.002712

Driven discrete time quantum walks

Author(s): Craig S Hamilton, Sonja Barkhofen, Linda Sansoni, Igor Jex, Christine Silberhorn
Published in: New Journal of Physics, Issue 18/7, 2016, Page(s) 073008, ISSN 1367-2630
DOI: 10.1088/1367-2630/18/7/073008

Experimental perfect state transfer of an entangled photonic qubit

Author(s): Robert J. Chapman, Matteo Santandrea, Zixin Huang, Giacomo Corrielli, Andrea Crespi, Man-Hong Yung, Roberto Osellame, Alberto Peruzzo
Published in: Nature Communications, Issue 7, 2016, Page(s) 11339, ISSN 2041-1723
DOI: 10.1038/ncomms11339

Is my boson sampler working?

Author(s): Marco Bentivegna, Nicolò Spagnolo, Fabio Sciarrino
Published in: New Journal of Physics, Issue 18/4, 2016, Page(s) 041001, ISSN 1367-2630
DOI: 10.1088/1367-2630/18/4/041001

Efficient simulation of non-Markovian system-environment interaction

Author(s): Robert Rosenbach, Javier Cerrillo, Susana F Huelga, Jianshu Cao, Martin B Plenio
Published in: New Journal of Physics, Issue 18/2, 2016, Page(s) 023035, ISSN 1367-2630
DOI: 10.1088/1367-2630/18/2/023035

Quantum walks with dynamical control: graph engineering, initial state preparation and state transfer

Author(s): Thomas Nitsche, Fabian Elster, Jaroslav Novotný, Aurél Gábris, Igor Jex, Sonja Barkhofen, Christine Silberhorn
Published in: New Journal of Physics, Issue 18/6, 2016, Page(s) 063017, ISSN 1367-2630
DOI: 10.1088/1367-2630/18/6/063017

Experimental Detection of Quantum Coherent Evolution through the Violation of Leggett-Garg-Type Inequalities

Author(s): Zong-Quan Zhou, Susana F. Huelga, Chuan-Feng Li, Guang-Can Guo
Published in: Physical Review Letters, Issue 115/11, 2015, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.115.113002

Efficient quantum walk on a quantum processor

Author(s): Xiaogang Qiang, Thomas Loke, Ashley Montanaro, Kanin Aungskunsiri, Xiaoqi Zhou, Jeremy L. O’Brien, Jingbo B. Wang, Jonathan C. F. Matthews
Published in: Nature Communications, Issue 7, 2016, Page(s) 11511, ISSN 2041-1723
DOI: 10.1038/ncomms11511

Efficiency of quantum controlled non-Markovian thermalization

Author(s): V Mukherjee, V Giovannetti, R Fazio, S F Huelga, T Calarco, S Montangero
Published in: New Journal of Physics, Issue 17/6, 2015, Page(s) 063031, ISSN 1367-2630
DOI: 10.1088/1367-2630/17/6/063031

Optical Signatures of Quantum Delocalization over Extended Domains in Photosynthetic Membranes

Author(s): Christopher A. Schroeder, Felipe Caycedo-Soler, Susana F. Huelga, Martin B. Plenio
Published in: The Journal of Physical Chemistry A, Issue 119/34, 2015, Page(s) 9043-9050, ISSN 1089-5639
DOI: 10.1021/acs.jpca.5b04804

Enhancing light-harvesting power with coherent vibrational interactions: A quantum heat engine picture

Author(s): N. Killoran, S. F. Huelga, M. B. Plenio
Published in: The Journal of Chemical Physics, Issue 143/15, 2015, Page(s) 155102, ISSN 0021-9606
DOI: 10.1063/1.4932307

Vibronic origin of long-lived coherence in an artificial molecular light harvester

Author(s): James Lim, David Paleček, Felipe Caycedo-Soler, Craig N. Lincoln, Javier Prior, Hans von Berlepsch, Susana F. Huelga, Martin B. Plenio, Donatas Zigmantas, Jürgen Hauer
Published in: Nature Communications, Issue 6, 2015, Page(s) 7755, ISSN 2041-1723
DOI: 10.1038/ncomms8755

Phase-dependent exciton transport and energy harvesting from thermal environments

Author(s): S. Oviedo-Casado, J. Prior, A. W. Chin, R. Rosenbach, S. F. Huelga, M. B. Plenio
Published in: Physical Review A, Issue 93/2, 2016, ISSN 2469-9926
DOI: 10.1103/PhysRevA.93.020102

Experimental superposition of orders of quantum gates

Author(s): Lorenzo M. Procopio, Amir Moqanaki, Mateus Araújo, Fabio Costa, Irati Alonso Calafell, Emma G. Dowd, Deny R. Hamel, Lee A. Rozema, Časlav Brukner, Philip Walther
Published in: Nature Communications, Issue 6, 2015, Page(s) 7913, ISSN 2041-1723
DOI: 10.1038/ncomms8913

Practical and efficient experimental characterization of multiqubit stabilizer states

Author(s): Chiara Greganti, Marie-Christine Roehsner, Stefanie Barz, Mordecai Waegell, Philip Walther
Published in: Physical Review A, Issue 91/2, 2015, ISSN 1094-1622
DOI: 10.1103/PhysRevA.91.022325

Generalized Multiphoton Quantum Interference

Author(s): Max Tillmann, Si-Hui Tan, Sarah E. Stoeckl, Barry C. Sanders, Hubert de Guise, René Heilmann, Stefan Nolte, Alexander Szameit, Philip Walther
Published in: Physical Review X, Issue 5/4, 2015, ISSN 2160-3308
DOI: 10.1103/PhysRevX.5.041015

Universal Quantum Computing with Arbitrary Continuous-Variable Encoding

Author(s): Hoi-Kwan Lau, Martin B. Plenio
Published in: Physical Review Letters, Issue 117/10, 2016, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.117.100501

Sensing in the presence of an observed environment

Author(s): Martin B. Plenio, Susana F. Huelga
Published in: Physical Review A, Issue 93/3, 2016, ISSN 2469-9926
DOI: 10.1103/PhysRevA.93.032123

Ultimate Precision Limits for Noisy Frequency Estimation

Author(s): Andrea Smirne, Jan Kołodyński, Susana F. Huelga, Rafał Demkowicz-Dobrzański
Published in: Physical Review Letters, Issue 116/12, 2016, ISSN 0031-9007
DOI: 10.1103/PhysRevLett.116.120801

On unitary reconstruction of linear optical networks

Author(s): Max Tillmann, Christian Schmidt, Philip Walther
Published in: Journal of Optics, Issue 18/11, 2016, Page(s) 114002, ISSN 2040-8978
DOI: 10.1088/2040-8978/18/11/114002

Towards quantum supremacy with lossy scattershot boson sampling

Author(s): Ludovico Latmiral, Nicolò Spagnolo, Fabio Sciarrino
Published in: New Journal of Physics, Issue 18/11, 2016, Page(s) 113008, ISSN 1367-2630
DOI: 10.1088/1367-2630/18/11/113008

Universal linear optics

Author(s): J. Carolan, C. Harrold, C. Sparrow, E. Martin-Lopez, N. J. Russell, J. W. Silverstone, P. J. Shadbolt, N. Matsuda, M. Oguma, M. Itoh, G. D. Marshall, M. G. Thompson, J. C. F. Matthews, T. Hashimoto, J. L. O'Brien, A. Laing
Published in: Science, Issue 349/6249, 2015, Page(s) 711-716, ISSN 0036-8075
DOI: 10.1126/science.aab3642