Coherence of a Josephson phase qubit under partial-collapse measurement
Leonid P. Pryadko, Alexander N. Korotkov
DOI 10.1103/PhysRevB.76.100503 · Physical Review B
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Abstract
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.
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