Coherence of a Josephson phase qubit under partial-collapse measurement

Details Coherence of a Josephson phase qubit under partial-collapse measurement Coherence of a Josephson phase qubit under partial-collapse measurement

2007-04-28

arxiv.org/abs/0704.3806v1

Phys. Rev. B 76, 100503(R) (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4p., 2eps figures

Scientific paper

10.1103/PhysRevB.76.100503

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 qubit retains coherence over a finite time interval independently of the rates of three competing decoherence processes. In this regime, the quantum decay process can be continuously monitored via a ``weak'' measurement without affecting the qubit coherence.

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