ANNEALING-BASED VARIATIONAL QUANTUM PROCESSORS

Leistungen

Assessment of hardware upgrades for improved devices

In this deliverable we will report on the design of basic superconducting qubits and tuneable couplers modelling realistic effects of crosstalk and decoherence With this information we will elaborate realistic implementations of variational quantum algorithms and their feasibility for implementation using the proposed hardwareWe will also report on the progress in building a classical simulator using a supercomputer

Fabrication of 5-qubit quantum annealing demonstrator

In this deliverable we will report on the production of a lowimpedance 5qubit device being the baseline for benchmarking experiments in WP3 following extensive design and simulation using feedback from task 41 This annealer will contain a qubit network with 10 rfSQUIDtype couplers The flux qubits will be optimized for QA with capacitiveshunting

Optimized design for multi-qubit and non-stoquastic couplers

In this deliverable we will report on designs and simulations to produce circuits that generate a twobody interaction of the type XX known as nonstoquastic or nonIsing as well as circuits that generate a multiqubit coupling term beyond 2 qubits

Project Management and Quality Guidelines

In this deliverable we will document administrative project management procedures quality assurance and risk managementThe report will include description of communication channels between all partners as well as defining and maintaining internal collaborative tools for sharing documentation and communicating work status One of the outcomes will be a Project Portal shared workspace that will be updated throughout the project and a project logo

Operational wideband parametric amplifier for QA

In this deliverable we will report on the production of an optimized traveling wave parametric amplifier TWPA to obtain an easytouse device and validated using multiqubit devices fabricated by UG Optimization of the readout efficiency for strongly anharmonic qubits such as flux and fluxoniumtype qubits will be carried out Figures of merit such as readout efficiency and crosstalk will be quantified

Prototype of CQA with high impedance circuits

In this deliverable we will report on the production and characterization of highimpedance coherent quantum annealers using fluxoniumtype qubits and their use in quantum annealing applications

Data Management Plan

In this deliverable following the Open Research Data Pilot we will document the lifecycle for all data sets collected processed and generated by AVaQus The data management plan will evolve along the project outlining data handling during and after the project what data will be collected following what methodology and what standards and whether it will be made open and how it will be preserved

Website

Publish project website using eu domain to disseminate project activities results news etc The portal will also be used to announce job offers

Veröffentlichungen

struqture

Autoren: Kirsten Bark, Nicolas Vogt, Rolando Reiner
Veröffentlicht in: 2022
Herausgeber: HQS Quantum Simulations GmbH

qoqo

Autoren: Nicolas Vogt, Kirsten Bark, Marina Walt, Matteo Lodi, Sebastian Zanker
Veröffentlicht in: 2021
Herausgeber: HQS Quantum Simulations GmbH

A haloscope amplification chain based on a traveling wave parametric amplifier

Autoren: Caterina Braggio, Giulio Cappelli, Giovanni Carugno, Nicolò Crescini, Raffaele Di Vora, Martina Esposito, Antonello Ortolan, Luca Planat, Arpit Ranadive, Nicolas Roch, Giuseppe Ruoso
Veröffentlicht in: Review of Scientific Instruments, Ausgabe 00346748, 2022, ISSN 0034-6748
Herausgeber: American Institute of Physics
DOI: 10.1063/5.0098039

Search for galactic axions with a traveling wave parametric amplifier

Autoren: R. Di Vora; A. Lombardi; A. Ortolan; R. Pengo; G. Ruoso; C. Braggio; G. Carugno; L. Taffarello; G. Cappelli; N. Crescini; M. Esposito; L. Planat; A. Ranadive; N. Roch; D. Alesini; D. Babusci; A. D’Elia; D. Di Gioacchino; C. Gatti; C. Ligi; G. Maccarrone; A. Rettaroli; S. Tocci; D. D’Agostino; U. Gambardella; G. Iannone; P. Falferi
Veröffentlicht in: Physical Review D, 2023, ISSN 2470-0010
Herausgeber: American Physical Society
DOI: 10.1103/physrevd.108.062005

Role of boundary conditions in the full counting statistics of topological defects after crossing a continuous phase transition

Autoren: Fernando J. Gómez-Ruiz, David Subires, and Adolfo del Campo
Veröffentlicht in: PHYSICAL REVIEW B, Ausgabe 24699950, 2022, ISSN 2469-9950
Herausgeber: American Physical Society
DOI: 10.1103/physrevb.106.134302

Three-Josephson junctions flux qubit couplings

Autoren: María Hita-Pérez, Gabriel Jaumà, Manuel Pino, and Juan José García-Ripoll.
Veröffentlicht in: Applied Physics Letters, Ausgabe Appl. Phys. Lett. 119, 222601 (2021), 2021, Seite(n) American Institute of Physics, ISSN 0003-6951
Herausgeber: American Institute of Physics
DOI: 10.1063/5.0069530

Transmission spectra of the driven, dissipative Rabi model in the USC regime

Autoren: Magazzù, L.; Forn-Díaz, P.; Grifoni, M.
Veröffentlicht in: Physical Review A, 2021, ISSN 2469-9934
Herausgeber: American Physical Society
DOI: 10.1103/physreva.104.053711

Quantum algorithm for solving open-system dynamics on quantum computers using noise

Autoren: Juha Leppäkangas; Nicolas Vogt; Keith R. Fratus; Kirsten Bark; Jesse A. Vaitkus; Pascal Stadler; Jan-Michael Reiner; Sebastian Zanker; Michael Marthaler
Veröffentlicht in: Physical Review A, 2023, ISSN 2469-9934
Herausgeber: American Physical Society
DOI: 10.1103/physreva.108.062424

Locality of spontaneous symmetry breaking and universal spacing distribution of topological defects formed across a phase transition

Autoren: Adolfo del Campo, Fernando Javier Gómez-Ruiz, and Hai-Qing Zhang
Veröffentlicht in: Physical Review B, 2022, ISSN 2469-9969
Herausgeber: American Physical Society
DOI: 10.1103/physrevb.106.l140101

Quantum Approximate Optimization Algorithm Pseudo-Boltzmann States

Autoren: Pablo Díez-Valle, Diego Porras, and Juan José García-Ripoll
Veröffentlicht in: Physical Review Letters, 2023, ISSN 1079-7114
Herausgeber: American Physical Society
DOI: 10.1103/physrevlett.130.050601

Experimental validation of theKibble-Zurek mechanism on adigital quantum computer

Autoren: Santiago Higuera-Quintero, Ferney J. Rodríguez, Luis Quiroga and Fernando J. Gómez-Ruiz
Veröffentlicht in: Front. Quantum. Sci. Technol., Ausgabe 28132181, 2022, ISSN 2813-2181
Herausgeber: Frontiers
DOI: 10.3389/frqst.2022.1026025

Gralmonium: Granular Aluminum Nano-Junction Fluxonium Qubit

Autoren: Rieger, D.; Günzler, S.; Spiecker, M.; Paluch, P.; Winkel, P.; Hahn, L.; Hohmann, J. K.; Bacher, A.; Wernsdorfer, W.; Pop, I. M.
Veröffentlicht in: Nature Materials, 2023, ISSN 1476-4660
Herausgeber: Springer
DOI: 10.1038/s41563-022-01417-9

Bound states in the continuum in a fluxonium qutrit

Autoren: María Hita-Pérez, Pedro A. Orellana, Juan José García-Ripoll, and Manuel Pino
Veröffentlicht in: Physical Review A, 2022, ISSN 2469-9934
Herausgeber: American Physical Society
DOI: 10.1103/physreva.106.062602

Ultrastrong capacitive coupling of flux qubits

Autoren: Hita-Pérez, María; Jaumà, Gabriel; Pino, Manuel; García-Ripoll, Juan José
Veröffentlicht in: Physical Review Applied, Ausgabe 1, 2021, Seite(n) 014028, ISSN 2331-7019
Herausgeber: American Physical Society
DOI: 10.1103/physrevapplied.17.014028

Startup Qilimanjaro—towards a European full-stack coherent quantum annealer platform

Autoren: V. Canivell, P. Forn-Díaz, A. Garcia-Saez, R. Sagastizabal
Veröffentlicht in: EPJ Quantum Technology, 2021, ISSN 2196-0763
Herausgeber: Springer Nature
DOI: 10.1140/epjqt/s40507-021-00094-y

Kibble–Zurek mechanism of Ising domains

Autoren: Kai Du, Xiaochen Fang, Choongjae Won, Chandan De, Fei-Ting Huang, Wenqian Xu, Hoydoo You, Fernando J. Gómez-Ruiz, Adolfo del Campo & Sang-Wook Cheong.
Veröffentlicht in: Nature Physics, 2023, ISSN 1745-2481
Herausgeber: Springer Nature
DOI: 10.1038/s41567-023-02112-5

Energy transfer in N-component nanosystems enhanced by pulse-driven vibronic many-body entanglement

Autoren: Fernando J, Gómez-Ruiz; Oscar L, Acevedo; Ferney J, Rodríguez; Luis, Quiroga; Neil F, Johnson
Veröffentlicht in: Scientific Reports, 2023, ISSN 2045-2322
Herausgeber: Nature Publishing Group
DOI: 10.1038/s41598-023-46256-z

A quantum Szilard engine for two-level systems coupled to a qubit

Autoren: Spiecker, Martin; Paluch, Patrick; Drucker, Niv; Matityahu, Shlomi; Gusenkova, Daria; Gosling, Nicolas; Günzler, Simon; Rieger, Dennis; Takmakov, Ivan; Valenti, Francesco; Winkel, Patrick; Gebauer, Richard; Sander, Oliver; Catelani, Gianluigi; Shnirman, Alexander; Ustinov, Alexey V.; Wernsdorfer, Wolfgang; Cohen, Yonatan; Pop, Ioan M.
Veröffentlicht in: Nature Physics, 2023, ISSN 1745-2481
Herausgeber: Springer
DOI: 10.1038/s41567-023-02082-8

Kerr reversal in Josephson meta-material and traveling wave parametric amplification

Autoren: Arpit Ranadive, Martina Esposito, Luca Planat, Edgar Bonet, Cécile Naud, Olivier Buisson, Wiebke Guichard & Nicolas Roch1
Veröffentlicht in: Nature Communications, 2022, Seite(n) 1737, ISSN 2041-1723
Herausgeber: Nature Publishing Group
DOI: 10.1038/s41467-022-29375-5

One qubit as a universal approximant

Autoren: Adrián Pérez-Salinas, David López-Núñez, Artur García-Sáez, P. Forn-Díaz, José I. Latorre
Veröffentlicht in: Physical Review A, Ausgabe 104/1, 2021, ISSN 2469-9926
Herausgeber: American Physical Society
DOI: 10.1103/physreva.104.012405

Perspective on traveling wave microwave parametric amplifiers

Autoren: Martina Esposito, Arpit Ranadive, Luca Planat, Nicolas Roch
Veröffentlicht in: Applied Physics Letters, Ausgabe 119/12, 2021, Seite(n) 120501, ISSN 0003-6951
Herausgeber: American Institute of Physics
DOI: 10.1063/5.0064892

Superconducting nitridized-aluminum thin films

Autoren: Torras-Coloma, Alba; de Olcoz, Leyre Martínez; Céspedes, Eva; Bertoldo, Elia; López-Núñez, David; Paul, Sagar; Wernsdorfer, Wolfgang; Rius, Gemma; Forn-Díaz, Pol
Veröffentlicht in: Superconductor Science and Technology, 2024, ISSN 0953-2048
Herausgeber: Institute of Physics Publishing
DOI: 10.1088/1361-6668/ad20fc

Observation of Two-Mode Squeezing in a Traveling Wave Parametric Amplifier

Autoren: Martina Esposito, Arpit Ranadive, Luca Planat, Sébastien Leger, Dorian Fraudet, Vincent Jouanny, Olivier Buisson, Wiebke Guichard, Cécile Naud, José Aumentado, Florent Lecocq, and Nicolas Roch
Veröffentlicht in: Physical Review Letters, 2022, ISSN 1079-7114
Herausgeber: American Physical Society
DOI: 10.1103/physrevlett.128.153603

Connection between single-layer Quantum Approximate Optimization Algorithm interferometry and thermal distributions sampling

Autoren: Díez-Valle, Pablo; Porras, Diego; García-Ripoll, Juan José
Veröffentlicht in: Frontiers in Quantum Science and Technology, 2024, ISSN 2813-2181
Herausgeber: Frontiers Media SA
DOI: 10.3389/frqst.2024.1321264

Operating in a deep underground facility improves the locking of gradiometric fluxonium qubits at the sweet spots

Autoren: D. Gusenkova, F. Valenti, M. Spiecker, S. Günzler, P.Paluch, D. Rieger, L.-M. Pioraş-Ţimbolma, L. P. Zârbo, N. Casali, I. Colantoni,A. Cruciani, S Pirro, L. Cardani, A. Petrescu, W. Wernsdorfer, P. Winkel, and I. M. Pop
Veröffentlicht in: Applied Physics Letters, 2022, Seite(n) 054001, ISSN 0003-6951
Herausgeber: American Institute of Physics
DOI: 10.1063/5.0075909

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