中国物理B ›› 2015, Vol. 24 ›› Issue (4): 40305-040305.doi: 10.1088/1674-1056/24/4/040305

• GENERAL • 上一篇    下一篇

High-dimensional quantum state transfer in a noisy network environment

秦伟a b c d, 李俊林b c d, 龙桂鲁b c d   

  1. a School of Physics, Beijing Institute of Technology, Beijing 100081, China;
    b State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China;
    c Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;
    d Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China
  • 收稿日期:2015-01-12 修回日期:2015-01-19 出版日期:2015-04-05 发布日期:2015-04-05
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175094 and 91221205) and the National Basic Research Program of China (Grant No. 2011CB9216002). Long Gui-Lu also thanks the support of Center of Atomic and Molecular Nanoscience of Tsinghua University, China.

High-dimensional quantum state transfer in a noisy network environment

Qin Wei (秦伟)a b c d, Li Jun-Lin (李俊林)b c d, Long Gui-Lu (龙桂鲁)b c d   

  1. a School of Physics, Beijing Institute of Technology, Beijing 100081, China;
    b State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China;
    c Collaborative Innovation Center of Quantum Matter, Beijing 100084, China;
    d Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China
  • Received:2015-01-12 Revised:2015-01-19 Online:2015-04-05 Published:2015-04-05
  • Contact: Long Gui-Lu E-mail:gllong@mail.tsinghua.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11175094 and 91221205) and the National Basic Research Program of China (Grant No. 2011CB9216002). Long Gui-Lu also thanks the support of Center of Atomic and Molecular Nanoscience of Tsinghua University, China.

摘要:

We propose and analyze an efficient high-dimensional quantum state transfer protocol in an XX coupling spin network with a hypercube structure or chain structure. Under free spin wave approximation, unitary evolution results in a perfect high-dimensional quantum swap operation requiring neither external manipulation nor weak coupling. Evolution time is independent of either distance between registers or dimensions of sent states, which can improve the computational efficiency. In the low temperature regime and thermodynamic limit, the decoherence caused by a noisy environment is studied with a model of an antiferromagnetic spin bath coupled to quantum channels via an Ising-type interaction. It is found that while the decoherence reduces the fidelity of state transfer, increasing intra-channel coupling can strongly suppress such an effect. These observations demonstrate the robustness of the proposed scheme.

关键词: quantum state transfer, quantum spin, hypercubes, spin wave

Abstract:

We propose and analyze an efficient high-dimensional quantum state transfer protocol in an XX coupling spin network with a hypercube structure or chain structure. Under free spin wave approximation, unitary evolution results in a perfect high-dimensional quantum swap operation requiring neither external manipulation nor weak coupling. Evolution time is independent of either distance between registers or dimensions of sent states, which can improve the computational efficiency. In the low temperature regime and thermodynamic limit, the decoherence caused by a noisy environment is studied with a model of an antiferromagnetic spin bath coupled to quantum channels via an Ising-type interaction. It is found that while the decoherence reduces the fidelity of state transfer, increasing intra-channel coupling can strongly suppress such an effect. These observations demonstrate the robustness of the proposed scheme.

Key words: quantum state transfer, quantum spin, hypercubes, spin wave

中图分类号:  (Quantum communication)

  • 03.67.Hk
75.10.Pq (Spin chain models) 03.65.Ud (Entanglement and quantum nonlocality)