近日，西南交通大学的韦联福及其研究团队取得一项新进展。经过不懈努力，他们实现用于高效探测巡回微波光子的非互易探测器阵列。相关研究成果已于2024年6月24日在国际知名学术期刊《物理评论A》上发表。

鉴于当前微波单光子探测器的探测效率仍然较低，该研究团队提出了一种非互易探测器阵列设计，旨在实现沿一维波导传输的单个巡回微波光子的高效探测。与以往由20多个原子探测器组成的互易阵列不同，研究指出，对于理想的探测效果，仅三个原子探测器的非互易阵列便足以确保单个巡回微波光子的确定性探测（即探测概率接近100%）。

具体来说，研究人员设计了一个由几个电流偏置约瑟夫森结单独耦合到普通微波传输线的阵列，然后讨论了它的可行性。

据悉，微波单光子探测是实现理想微波量子信息处理的关键任务之一。

附：英文原文

Title: Nonreciprocity detector arrays for high-efficiency detection of itinerant microwave photons

Author: Suirong He, Penghui Ouyang, Haiyan Gao, Yufen Li, Jiaxing He, L. F. Wei

Issue&Volume: 2024/06/24

Abstract: Microwave single-photon detection is one of the critical tasks for the implementation of the desired microwave quantum information processing. Given the detection efficiency of the demonstrated microwave single-photon detector is still very limited, here, we propose a nonreciprocity detector array to implement high-efficiency detection of a single itinerant microwave photon, transported along a one-dimensional waveguide. We show that different from the reciprocity array with more than 20 atomic detectors [Romero et al., Phys. Rev. Lett. 102, 173602 (2009)] for ideal detection, the nonreciprocity array with just three atomic detectors is sufficient to achieve deterministic detection (i.e., the achievable probability approaches 100%) of a single itinerant microwave photon. Specifically, we design an array with a few current-biased Josephson junctions individually coupled to a common microwave transmission line and then discuss its feasibility.

DOI: 10.1103/PhysRevA.109.062430

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.062430