Accurate Parity Meter Based on Coherent State Measurement

被引：5
|
作者：
Xiao, Yang [1 ,2 ]
Zheng, Ri-Hua [1 ,2 ]
Liu, Yang [1 ,2 ]
Kang, Yi-Hao [3 ]
Song, Jie [3 ]
Xia, Yan [1 ,2 ]
机构：
[1] Fuzhou Univ, Fujian Key Lab Quantum Informat & Quantum Opt, Fuzhou 350116, Peoples R China
[2] Fuzhou Univ, Dept Phys, Fuzhou 350116, Peoples R China
[3] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
来源：
ANNALEN DER PHYSIK | 2022年 / 534卷 / 02期
基金：
中国国家自然科学基金;
关键词：
coherent states; homodyne measurements; parity meters; QUANTUM; TELEPORTATION; ENTANGLEMENT;
D O I：
10.1002/andp.202100461
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Parity meter is the core step of many quantum information works. In this paper, a robust and accurate protocol to construct a parity meter of two artificial atoms coupled to a cavity is proposed. Specifically, when the atomic system is in states with different parities, the cavity will evolve into different states. Then, the parity information of the atomic system can be distinguished by measuring the state of the cavity via the homodyne measurement. In addition, the influence of decoherence (including the cavity decay, the atomic spontaneous emission, and the dephasing) and systematic errors are numerically discussed. The results show that the protocol is robust against these negative factors. Therefore, this protocol may provide helpful perspectives for accurate parity meters.
引用
收藏
页数：7
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