Chu Yaoming, Liu Yu, Liu Haibin, Cai Jianming
School of Physics, International Joint Laboratory on Quantum Sensing and Quantum Metrology, Huazhong University of Science and Technology, Wuhan 430074, China.
Phys Rev Lett. 2020 Jan 17;124(2):020501. doi: 10.1103/PhysRevLett.124.020501.
Quantum sensing exploits the fundamental features of a quantum system to achieve highly efficient measurement of physical quantities. Here, we propose a strategy to realize a single-qubit pseudo-Hermitian sensor from a dilated two-qubit Hermitian system. The pseudo-Hermitian sensor exhibits divergent susceptibility in a dynamical evolution that does not necessarily involve an exceptional point. We demonstrate its potential advantages to overcome noises that cannot be averaged out by repetitive measurements. The proposal is feasible with the state-of-art experimental capability in a variety of qubit systems, and represents a step towards the application of non-Hermitian physics in quantum sensing.
量子传感利用量子系统的基本特性来实现对物理量的高效测量。在此，我们提出一种策略，从一个扩张的两比特厄米系统实现单比特伪厄米传感器。该伪厄米传感器在不一定涉及例外点的动力学演化中表现出发散的敏感性。我们展示了其克服无法通过重复测量消除的噪声的潜在优势。该提议在各种量子比特系统中凭借当前的实验能力是可行的，并且代表了非厄米物理在量子传感应用方面迈出的一步。
