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
影响因子:
3.7
通讯作者:
L. Pryadko;A. Korotkov
中科院分区:
文献类型:
--
作者:
L. Pryadko;A. Korotkov
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.