Approaching energy quantum limit detection of microwave photons with Josephson Junctions

Abstract

Single-photon detection is an energy quantum limit detection (EQLD) of a significantly weak electromagnetic wave. Given the sensitivity of the conventional electromagnetic induction microwave receiver working at room-temperature is very limited, due to the significantly strong thermal noise, here we analyze the possibility of approaching the EQLD of the weak microwave signal by using a current-biased Josephson Junction (CBJJ) detector. By numerically simulating the dynamics for the phase particle of the CBJJ, we propose an approach to describe the discriminability between the probabilistically escaped events of the phase particle with and without the microwave current driving, by measuring the minimum $d_{\mathrm{KC}}$-index. We predicate that, the experimentally demonstrated CBJJ detectors possess the ability to resolve about a dozen photons. The feasibility of the desired EQLD of microwave signal by using the CBJJ detector is also discussed.

9 pages, 10 figures

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Cited by in corpus (4)

• Experimental demonstrations of Josephson threshold detectors for broadband microwave photons detection
• High-Efficiency Tunable Microwave Photon Detector Based on a Semiconductor Double Quantum Dot Coupled to a Superconducting High-Impedance Cavity
• A broadband single microwave-photon detector insensitive to the thermal noise
• Measuring weak microwave signals via current-biased Josephson Junctions II: Arriving at single-photon detection sensitivity