Coherence of a Josephson phase qubit under partial-collapse measurement

Coherence of a Josephson phase qubit under partial-collapse measurement
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DOI:
10.1103/physrevb.76.100503
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发表时间:
2007-04
期刊:
影响因子:
3.7
通讯作者:
L. Pryadko;A. Korotkov
L. Pryadko;A. Korotkov
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
L. Pryadko;A. Korotkov

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结合Katz等人最近的一项实验,我们讨论了衰减态的量子演化。基于一个简单模型的精确解析解和数值解,我们确定了一种机制,其中量子比特在有限的时间间隔内保持相干,而与三个相互竞争的退相干过程的速率无关。在这种情况下,可以通过“弱”测量连续监测量子衰变过程,而不影响量子比特的相干性。
We discuss quantum evolution of a decaying state in relation to a recent experiment of Katz et al. Based on exact analytical and numerical solutions of a simple model, we identify a regime where the qubit retains coherence over a finite time interval independently of the rates of the three competing decoherence processes. In this regime, the quantum decay process can be continuously monitored via a ``weak'' measurement without affecting the qubit coherence.