中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4711-4715.doi: 10.1088/1674-1056/18/11/017

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Preservation of quantum states via a super-Zeno effect on ensemble quantum computers

罗军1, 孙献平1, 詹明生1, 任婷婷2   

  1. (1)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China; (2)State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China;Gra
  • 收稿日期:2009-03-30 修回日期:2009-04-29 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374103, 10574143 and 10874206) and the National Key Basic Research Program of China (Grant No 2006CB921203).

Preservation of quantum states via a super-Zeno effect on ensemble quantum computers

Ren Ting-Ting(任婷婷)a)b)c),Luo Jun(罗军) a)b), Sun Xian-Ping(孙献平)a)b), and Zhan Ming-Sheng(詹明生)a)b)†   

  1. a State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; b Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071, China; c Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-03-30 Revised:2009-04-29 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10374103, 10574143 and 10874206) and the National Key Basic Research Program of China (Grant No 2006CB921203).

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摘要： Following a recent proposal by Dhar et al (2006 Phys. Rev. Lett. 96 100405), we demonstrate experimentally the preservation of quantum states in a two-qubit system based on a super-Zeno effect using liquid-state nuclear magnetic resonance techniques. Using inverting radiofrequency pulses and delicately selecting time intervals between two pulses, we suppress the effect of decoherence of quantum states. We observe that preservation of the quantum state |11\rg with the super-Zeno effect is three times more efficient than the ordinary one with the standard Zeno effect.

Abstract: Following a recent proposal by Dhar et al (2006 Phys. Rev. Lett. 96 100405), we demonstrate experimentally the preservation of quantum states in a two-qubit system based on a super-Zeno effect using liquid-state nuclear magnetic resonance techniques. Using inverting radiofrequency pulses and delicately selecting time intervals between two pulses, we suppress the effect of decoherence of quantum states. We observe that preservation of the quantum state |11$\rangle$ with the super-Zeno effect is three times more efficient than the ordinary one with the standard Zeno effect.

Key words: quantum information, decoherence, Zeno effect, quantum state preservation

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
03.65.Yz (Decoherence; open systems; quantum statistical methods) 03.65.Xp (Tunneling, traversal time, quantum Zeno dynamics)