ANNEALING-BASED VARIATIONAL QUANTUM PROCESSORS

Livrables

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

Publications

struqture

Auteurs: Kirsten Bark, Nicolas Vogt, Rolando Reiner
Publié dans: 2022
Éditeur: HQS Quantum Simulations GmbH

qoqo

Auteurs: Nicolas Vogt, Kirsten Bark, Marina Walt, Matteo Lodi, Sebastian Zanker
Publié dans: 2021
Éditeur: HQS Quantum Simulations GmbH

A haloscope amplification chain based on a traveling wave parametric amplifier

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

Search for galactic axions with a traveling wave parametric amplifier

Auteurs: 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
Publié dans: Physical Review D, 2023, ISSN 2470-0010
Éditeur: 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

Auteurs: Fernando J. Gómez-Ruiz, David Subires, and Adolfo del Campo
Publié dans: PHYSICAL REVIEW B, Numéro 24699950, 2022, ISSN 2469-9950
Éditeur: American Physical Society
DOI: 10.1103/physrevb.106.134302

Three-Josephson junctions flux qubit couplings

Auteurs: María Hita-Pérez, Gabriel Jaumà, Manuel Pino, and Juan José García-Ripoll.
Publié dans: Applied Physics Letters, Numéro Appl. Phys. Lett. 119, 222601 (2021), 2021, Page(s) American Institute of Physics, ISSN 0003-6951
Éditeur: American Institute of Physics
DOI: 10.1063/5.0069530

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

Auteurs: Magazzù, L.; Forn-Díaz, P.; Grifoni, M.
Publié dans: Physical Review A, 2021, ISSN 2469-9934
Éditeur: American Physical Society
DOI: 10.1103/physreva.104.053711

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

Auteurs: Juha Leppäkangas; Nicolas Vogt; Keith R. Fratus; Kirsten Bark; Jesse A. Vaitkus; Pascal Stadler; Jan-Michael Reiner; Sebastian Zanker; Michael Marthaler
Publié dans: Physical Review A, 2023, ISSN 2469-9934
Éditeur: 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

Auteurs: Adolfo del Campo, Fernando Javier Gómez-Ruiz, and Hai-Qing Zhang
Publié dans: Physical Review B, 2022, ISSN 2469-9969
Éditeur: American Physical Society
DOI: 10.1103/physrevb.106.l140101

Quantum Approximate Optimization Algorithm Pseudo-Boltzmann States

Auteurs: Pablo Díez-Valle, Diego Porras, and Juan José García-Ripoll
Publié dans: Physical Review Letters, 2023, ISSN 1079-7114
Éditeur: American Physical Society
DOI: 10.1103/physrevlett.130.050601

Experimental validation of theKibble-Zurek mechanism on adigital quantum computer

Auteurs: Santiago Higuera-Quintero, Ferney J. Rodríguez, Luis Quiroga and Fernando J. Gómez-Ruiz
Publié dans: Front. Quantum. Sci. Technol., Numéro 28132181, 2022, ISSN 2813-2181
Éditeur: Frontiers
DOI: 10.3389/frqst.2022.1026025

Gralmonium: Granular Aluminum Nano-Junction Fluxonium Qubit

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

Bound states in the continuum in a fluxonium qutrit

Auteurs: María Hita-Pérez, Pedro A. Orellana, Juan José García-Ripoll, and Manuel Pino
Publié dans: Physical Review A, 2022, ISSN 2469-9934
Éditeur: American Physical Society
DOI: 10.1103/physreva.106.062602

Ultrastrong capacitive coupling of flux qubits

Auteurs: Hita-Pérez, María; Jaumà, Gabriel; Pino, Manuel; García-Ripoll, Juan José
Publié dans: Physical Review Applied, Numéro 1, 2021, Page(s) 014028, ISSN 2331-7019
Éditeur: American Physical Society
DOI: 10.1103/physrevapplied.17.014028

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

Auteurs: V. Canivell, P. Forn-Díaz, A. Garcia-Saez, R. Sagastizabal
Publié dans: EPJ Quantum Technology, 2021, ISSN 2196-0763
Éditeur: Springer Nature
DOI: 10.1140/epjqt/s40507-021-00094-y

Kibble–Zurek mechanism of Ising domains

Auteurs: 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.
Publié dans: Nature Physics, 2023, ISSN 1745-2481
Éditeur: Springer Nature
DOI: 10.1038/s41567-023-02112-5

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

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

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

Auteurs: 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.
Publié dans: Nature Physics, 2023, ISSN 1745-2481
Éditeur: Springer
DOI: 10.1038/s41567-023-02082-8

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

Auteurs: Arpit Ranadive, Martina Esposito, Luca Planat, Edgar Bonet, Cécile Naud, Olivier Buisson, Wiebke Guichard & Nicolas Roch1
Publié dans: Nature Communications, 2022, Page(s) 1737, ISSN 2041-1723
Éditeur: Nature Publishing Group
DOI: 10.1038/s41467-022-29375-5

One qubit as a universal approximant

Auteurs: Adrián Pérez-Salinas, David López-Núñez, Artur García-Sáez, P. Forn-Díaz, José I. Latorre
Publié dans: Physical Review A, Numéro 104/1, 2021, ISSN 2469-9926
Éditeur: American Physical Society
DOI: 10.1103/physreva.104.012405

Perspective on traveling wave microwave parametric amplifiers

Auteurs: Martina Esposito, Arpit Ranadive, Luca Planat, Nicolas Roch
Publié dans: Applied Physics Letters, Numéro 119/12, 2021, Page(s) 120501, ISSN 0003-6951
Éditeur: American Institute of Physics
DOI: 10.1063/5.0064892

Superconducting nitridized-aluminum thin films

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

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

Auteurs: 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
Publié dans: Physical Review Letters, 2022, ISSN 1079-7114
Éditeur: American Physical Society
DOI: 10.1103/physrevlett.128.153603

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

Auteurs: Díez-Valle, Pablo; Porras, Diego; García-Ripoll, Juan José
Publié dans: Frontiers in Quantum Science and Technology, 2024, ISSN 2813-2181
Éditeur: 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

Auteurs: 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
Publié dans: Applied Physics Letters, 2022, Page(s) 054001, ISSN 0003-6951
Éditeur: American Institute of Physics
DOI: 10.1063/5.0075909

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