Number-Resolved Photocounter for Propagating Microwave Mode
ORAL
Abstract
The first detectors of propagating microwave photons have been realized using superconducting circuits a decade ago. However a number-resolved photocounter is still missing. We demonstrate a single-shot counter for propagating microwave photons that can resolve up to 3 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. 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%.[1]
[1] R. Dassonneville, et al., Phys. Rev. Applied 14, 044022 (2020)
[1] R. Dassonneville, et al., Phys. Rev. Applied 14, 044022 (2020)
*This work is part of a project that has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 820505.
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Presenters
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Réouven Assouly
- ENS Lyon
- Ecole Normale Superieure de Lyon
- Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique,F-69342 Lyon, France