Number-resolved photocounter for propagating microwave mode

• URL: http://arxiv.org/abs/2004.05114v2
• Date: Thu, 15 Oct 2020 08:08:00 GMT
• Title: Number-resolved photocounter for propagating microwave mode
• Authors: R\'emy Dassonneville, R\'eouven Assouly, Th\'eau Peronnin, Pierre Rouchon and Benjamin Huard
• Abstract summary: A single-shot counter for propagating microwave photons can resolve up to $3$ photons. A transmon qubit counts the number of photons in the memory mode using a series of binary questions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 $99\%$.

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