中国物理B ›› 2017, Vol. 26 ›› Issue (7): 74205-074205.doi: 10.1088/1674-1056/26/7/074205

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Quantum feedback cooling of two trapped ions

Shuo Zhang(张硕), Wei Wu(吴伟), Chun-Wang Wu(吴春旺), Feng-Guang Li(李风光), Tan Li(李坦), Xiang Wang(汪翔), Wan-Su Bao(鲍皖苏)   

  1. 1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
    2 College of Science, National University of Defense Technology, Changsha 410073, China;
    3 Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou 450004, China
  • 收稿日期:2016-12-19 修回日期:2017-03-01 出版日期:2017-07-05 发布日期:2017-07-05
  • 通讯作者: Wei Wu, Chun-Wang Wu E-mail:weiwu@nudt.edu.cn;cwwu@nudt.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos.11504430,61205108,and 11304387) and the National Key R&D Program of China (Grant No.2016YFA0301903).

Quantum feedback cooling of two trapped ions

Shuo Zhang(张硕)1,3, Wei Wu(吴伟)2, Chun-Wang Wu(吴春旺)2, Feng-Guang Li(李风光)1, Tan Li(李坦)1, Xiang Wang(汪翔)1, Wan-Su Bao(鲍皖苏)1   

  1. 1 Zhengzhou Information Science and Technology Institute, Zhengzhou 450004, China;
    2 College of Science, National University of Defense Technology, Changsha 410073, China;
    3 Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou 450004, China
  • Received:2016-12-19 Revised:2017-03-01 Online:2017-07-05 Published:2017-07-05
  • Contact: Wei Wu, Chun-Wang Wu E-mail:weiwu@nudt.edu.cn;cwwu@nudt.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos.11504430,61205108,and 11304387) and the National Key R&D Program of China (Grant No.2016YFA0301903).

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摘要：

We present a sub-Doppler cooling scheme of a two-trapped-ion crystal by quantum feedback control method. In the scheme, we obtain the motional information by continuously measuring the spontaneous emission photons from one single ion of the crystal, and then apply a feedback force to cool the whole chain down.We derive the cooling dynamics of the cooling scheme using quantum feedback theory and quantum regression theorem. The result shows that with experimentally achievable parameters, our scheme can achieve lower temperature and faster cooling rate than Doppler cooling.

关键词: laser cooling, trapped ion, quantum optics

Abstract:

We present a sub-Doppler cooling scheme of a two-trapped-ion crystal by quantum feedback control method. In the scheme, we obtain the motional information by continuously measuring the spontaneous emission photons from one single ion of the crystal, and then apply a feedback force to cool the whole chain down.We derive the cooling dynamics of the cooling scheme using quantum feedback theory and quantum regression theorem. The result shows that with experimentally achievable parameters, our scheme can achieve lower temperature and faster cooling rate than Doppler cooling.

Key words: laser cooling, trapped ion, quantum optics

中图分类号:  (Quantum fluctuations, quantum noise, and quantum jumps)

  • 42.50.Lc
42.50.Wk (Mechanical effects of light on material media, microstructures and particles) 03.65.Ta (Foundations of quantum mechanics; measurement theory)