Reducing decoherence in quantum-computer memory with all quantum bits coupling to the same environment
Reducing decoherence in quantum-computer memory with all quantum bits coupling to the same environment
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DOI：
10.1103/physreva.57.737
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发表时间：
1996-11
影响因子：
2.9
通讯作者：
L. Duan;G. Guo
中科院分区：
文献类型：
--
作者：
L. Duan;G. Guo
由于不可避免的耦合到外部环境中的量子计算机存储器的退相干检查。我们假设所有的量子比特（qubit）都与相同的环境相互作用，而不是假设不同的量子比特有不同的环境。研究发现，量子比特是集体退相干的。对于某些类型的纠缠输入态，即使量子比特与环境相互作用，存储器中也不会发生退相干。基于这种现象，提出了一种减小集体退相干的方案。我们还讨论了这种退相干模型的量子测量的可能影响。
Decoherence in quantum-computer memory due to the inevitable coupling to the external environment is examined. We make the assumption that all quantum bits (qubits) interact with the same environment rather than the assumption of separate environments for different qubits. It is found that the qubits decohere collectively. For some kinds of entangled input states, no decoherence occurs at all in the memory, even if the qubits are interacting with the environment. Based on this phenomenon, a scheme is proposed for reducing the collective decoherence. We also discuss possible implications of this decoherence model for quantum measurements.