J4 ›› 2016, Vol. 33 ›› Issue (5): 553-560.

• 量子光学 • 上一篇    下一篇

克服腔QED中比特反转错误的无退相干子空间量子计算

陈月月, 刘呈普, 冯勋立   

  1. 1中科院上海光学精密机械研究所,强场物理国家重点实验室,上海 201800; 2中国科学院大学,北京 100039; 3上海师范大学数理学院,上海 200234
  • 收稿日期:2015-01-04 修回日期:2016-04-21 出版日期:2016-09-28 发布日期:2016-09-28
  • 作者简介:陈月月 (1987-),山东人,博士生,主要从事量子信息与量子计算研究。E-mail:chenyueyue@siom.ac.cn
  • 基金资助:
    国家自然科学基金(11074079和11374318)资助

Quantum computation in decoherence-free subspaces for overcoming bit-flip erroe in cavity QED

Chen Yue-Yue, Liu Chengpu, Feng Xun-Li   

  1. 1 State Key Laboratory of High Field Laser Physics, Shanghai Institution of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; 2 University of Chinese Academy of Sciences, Beijing 100039, China; 3 Department of Physics, Shanghai Normal University, Shanghai 200234, China
  • Received:2015-01-04 Revised:2016-04-21 Published:2016-09-28 Online:2016-09-28

摘要: 提出了一种抑制集体比特反转错误的无退相干子空间量子计算方案。该方案基于腔电动力学系统,用囚禁于腔中的两个相邻原子编码一个逻辑比特的编码方案,构造出不受比特反转错误影响的四维无退相干子空间。并通过调节外加光场和与腔的耦合,在此无退相干子空间中实现了两个非对易的单比特操作和控制相位门,从而实现了克服集体比特反转错误的通用量子计算。

关键词: 量子光学; 通用量子计算; 无退相干子空间; 比特反转错误

Abstract: A scheme for quantum computation avoiding collective bit-flip decoherence is presented. The scheme is based on a cavity system with several identical atoms trapped inside. By using two adjacent atoms to encode one logical qubit, a four-dimensional decoherence-free subspace free from collective bit-flip docoherence is constructed. We implement two noncommutative single-qubit operations and a controlled phase gate to realize the universal quantum computation in the decoherence-free subspace.

Key words: universal quantum computation