Method for quantum-jump continuous-time quantum error correction

Method for quantum-jump continuous-time quantum error correction
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量子跳跃连续时间量子纠错方法

DOI:
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发表时间:
2015
期刊:
影响因子:
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通讯作者:
T. Brun
T. Brun
中科院分区:
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文献类型:
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作者:
Kung;T. Brun

文献摘要

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连续时间量子纠错(CTQEC)是一种保护量子信息免受退相干影响的技术,其中退相干和纠错过程都被认为是时间上连续的。给定任意[[n,k,d]]量子稳定子码,我们构造了一类实现CTQEC的协议,包括弱相干测量和弱么正校正.在这种形式主义下,我们证明了辅助系统的最小所需大小是n-k+1个量子比特,并且我们提出了一个满足这一最小要求的方案。此外,我们比较我们的方法与其他已知的计划,并表明,本文中描述的性能的一个特定的措施时,使用我们的方法更好。
Continuous-time quantum error correction (CTQEC) is a technique for protecting quantum information against decoherence, where both the decoherence and error correction processes are considered continuous in time. Given any [[n,k,d]] quantum stabilizer code, we formulate a class of protocols to implement CTQEC, involving weak coherent measurements and weak unitary corrections. Under this formalism, we show that the minimal required size of the ancillary system is n-k+1 qubits, and we propose one scheme that meets this minimal requirement. Furthermore, we compare our method with other known schemes, and show that a particular measure of performance described in this paper is better when using our method.