Cyclically operated Single Microwave Photon Counter with $10^\mathrm{-22}$ $\mathrm{W/\sqrt{Hz}}$ sensitivity

• URL: http://arxiv.org/abs/2307.03614v3
• Date: Sat, 13 Jan 2024 18:50:43 GMT
• Title: Cyclically operated Single Microwave Photon Counter with $10^\mathrm{-22}$ $\mathrm{W/\sqrt{Hz}}$ sensitivity
• Authors: L\'eo Balembois, Jaime Travesedo, Louis Pallegoix, Alexandre May, Eric Billaud, Marius Villiers, Daniel Est\`eve, Denis Vion, Patrice Bertet, Emmanuel Flurin
• Abstract summary: Single photon detection played an important role in the development of quantum optics. In recent years, significant progress has been made in developing single microwave photon detectors (SMPDs) based on superconducting quantum bits or bolometers. We present a practical SMPD based on the irreversible transfer of an incoming photon to the excited state of a transmon qubit by a four-wave mixing process.
• Score: 33.7054351451505
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Single photon detection played an important role in the development of quantum optics. Its implementation in the microwave domain is challenging because the photon energy is 5 orders of magnitude smaller. In recent years, significant progress has been made in developing single microwave photon detectors (SMPDs) based on superconducting quantum bits or bolometers. In this paper we present a practical SMPD based on the irreversible transfer of an incoming photon to the excited state of a transmon qubit by a four-wave mixing process. This device achieves a detection efficiency $\eta = 0.43$ and an operational dark count rate $\alpha = 85$ $\mathrm{s^{-1}}$, mainly due to the out-of-equilibrium microwave photons in the input line. The corresponding power sensitivity is $\mathcal{S} = 10^{-22}$ $\mathrm{W/\sqrt{Hz}}$, one order of magnitude lower than the state of the art. The detector operates continuously over hour timescales with a duty cycle $\eta_\mathrm{D}=0.84$, and offers frequency tunability of at least 50 MHz around 7 GHz.

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