Multiplexed Photon Number Measurement

Multiplexed Photon Number Measurement

When a two-level system—a qubit—is used as a probe of a larger system, it naturally leads to answering a single yes-no question about the system state. Here we propose a method where a single qubit is able to extract, not a single, but many bits of information about the photon number of a microwave...

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Auteurs principaux: Antoine Essig, Quentin Ficheux, Théau Peronnin, Nathanaël Cottet, Raphaël Lescanne, Alain Sarlette, Pierre Rouchon, Zaki Leghtas, Benjamin Huard
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Langue:EN
Publié: American Physical Society 2021
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Physics
QC1-999
Accès en ligne:https://doaj.org/article/3e700cf2399b4304a50e476d0568c7de
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spelling oai:doaj.org-article:3e700cf2399b4304a50e476d0568c7de2021-12-02T16:33:32ZMultiplexed Photon Number Measurement10.1103/PhysRevX.11.0310452160-3308https://doaj.org/article/3e700cf2399b4304a50e476d0568c7de2021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031045http://doi.org/10.1103/PhysRevX.11.031045https://doaj.org/toc/2160-3308When a two-level system—a qubit—is used as a probe of a larger system, it naturally leads to answering a single yes-no question about the system state. Here we propose a method where a single qubit is able to extract, not a single, but many bits of information about the photon number of a microwave resonator using continuous measurement. We realize a proof-of-principle experiment by recording the fluorescence emitted by a superconducting qubit reflecting a frequency comb, thus implementing multiplexed photon counting where the information about each Fock state—from 0 to 8—is simultaneously encoded in independent measurement channels. Direct Wigner tomography of the quantum state of the resonator evidences the backaction of the measurement as well as the optimal information extraction parameters. Our experiment unleashes the full potential of quantum meters by replacing sequential quantum measurements with simultaneous and continuous measurements separated in the frequency domain.Antoine EssigQuentin FicheuxThéau PeronninNathanaël CottetRaphaël LescanneAlain SarlettePierre RouchonZaki LeghtasBenjamin HuardAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031045 (2021)
institution DOAJ
collection DOAJ
language EN
topic Physics
QC1-999
spellingShingle Physics
QC1-999
Antoine Essig
Quentin Ficheux
Théau Peronnin
Nathanaël Cottet
Raphaël Lescanne
Alain Sarlette
Pierre Rouchon
Zaki Leghtas
Benjamin Huard
Multiplexed Photon Number Measurement
description When a two-level system—a qubit—is used as a probe of a larger system, it naturally leads to answering a single yes-no question about the system state. Here we propose a method where a single qubit is able to extract, not a single, but many bits of information about the photon number of a microwave resonator using continuous measurement. We realize a proof-of-principle experiment by recording the fluorescence emitted by a superconducting qubit reflecting a frequency comb, thus implementing multiplexed photon counting where the information about each Fock state—from 0 to 8—is simultaneously encoded in independent measurement channels. Direct Wigner tomography of the quantum state of the resonator evidences the backaction of the measurement as well as the optimal information extraction parameters. Our experiment unleashes the full potential of quantum meters by replacing sequential quantum measurements with simultaneous and continuous measurements separated in the frequency domain.
format article
author Antoine Essig
Quentin Ficheux
Théau Peronnin
Nathanaël Cottet
Raphaël Lescanne
Alain Sarlette
Pierre Rouchon
Zaki Leghtas
Benjamin Huard
author_facet Antoine Essig
Quentin Ficheux
Théau Peronnin
Nathanaël Cottet
Raphaël Lescanne
Alain Sarlette
Pierre Rouchon
Zaki Leghtas
Benjamin Huard
author_sort Antoine Essig
title Multiplexed Photon Number Measurement
title_short Multiplexed Photon Number Measurement
title_full Multiplexed Photon Number Measurement
title_fullStr Multiplexed Photon Number Measurement
title_full_unstemmed Multiplexed Photon Number Measurement
title_sort multiplexed photon number measurement
publisher American Physical Society
publishDate 2021
url https://doaj.org/article/3e700cf2399b4304a50e476d0568c7de
work_keys_str_mv AT antoineessig multiplexedphotonnumbermeasurement
AT quentinficheux multiplexedphotonnumbermeasurement
AT theauperonnin multiplexedphotonnumbermeasurement
AT nathanaelcottet multiplexedphotonnumbermeasurement
AT raphaellescanne multiplexedphotonnumbermeasurement
AT alainsarlette multiplexedphotonnumbermeasurement
AT pierrerouchon multiplexedphotonnumbermeasurement
AT zakileghtas multiplexedphotonnumbermeasurement
AT benjaminhuard multiplexedphotonnumbermeasurement
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