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Number-Resolved Photocounter for Propagating Microwave Mode
Abstract : Detectors of propagating microwave photons have recently been realized using superconducting circuits. However a number-resolved photocounter is still missing. In this letter, 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 $0.96 \pm 0.04$, and a dark count probability of $0.030 \pm 0.002$ for an average dead time of $4.5~\mathrm{\mu s}$. To maximize its performance, the device is first used as an \emph{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 $(54 \pm 2)\%$ to $99\%$.
https://hal.inria.fr/hal-03084905
Contributor : Mazyar Mirrahimi <>
Submitted on : Monday, December 21, 2020 - 2:19:57 PM
Last modification on : Wednesday, December 23, 2020 - 3:37:47 AM
Contributor : Mazyar Mirrahimi <>
Submitted on : Monday, December 21, 2020 - 2:19:57 PM
Last modification on : Wednesday, December 23, 2020 - 3:37:47 AM
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