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Number-Resolved Photocounter for Propagating Microwave Mode

R. Dassonneville, R. Assouly, T. Peronnin, P. Rouchon, and B. Huard
Phys. Rev. Applied 14, 044022 – Published 14 October 2020

Abstract

Detectors of propagating microwave photons have recently been realized using superconducting circuits. However, a number-resolved photocounter is still missing. In this article, we demonstrate a single-shot counter for propagating microwave photons that can resolve up to three photons. It is based on a pumped Josephson ring modulator that can catch an arbitrary propagating mode by frequency conversion and store its quantum state in a stationary memory mode. A transmon qubit then counts the number of photons in the memory mode using a series of binary questions. Using measurement-based feedback, the number of questions is minimal and scales logarithmically with the maximal number of photons. The detector features a detection efficiency of 0.96±0.04, and a dark-count probability of 0.030±0.002 for an average dead time of 4.5μs. To maximize its performance, the device is first used as an in situ waveform detector from which an optimal pump is computed and applied. Depending on the number of incoming photons, the detector succeeds with a probability that ranges from 54±2 to 99%.

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  • Received 10 April 2020
  • Revised 4 September 2020
  • Accepted 15 September 2020

DOI:https://doi.org/10.1103/PhysRevApplied.14.044022

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

R. Dassonneville1, R. Assouly1, T. Peronnin1, P. Rouchon2,3, and B. Huard1,*

  • 1Laboratoire de Physique, Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Lyon F-69342, France
  • 2Centre Automatique et Systèmes, Mines-ParisTech, PSL Research University, 60 bd Saint-Michel, Paris 75006, France
  • 3QUANTIC team, INRIA de Paris, 2 rue Simone Iff, Paris 75012, France

  • *benjamin.huard@ens-lyon.fr

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Vol. 14, Iss. 4 — October 2020

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