Coherence of a Josephson phase qubit under partial-collapse measurement

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 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.

4p., 2eps figures

References in corpus (4)

• Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
• Selective quantum evolution of a qubit state due to continuous measurement
• Interaction-free measurements with superconducting qubits
• Macroscopic resonant tunneling of magnetic flux

Cited by in corpus (13)

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• Quantum Bayesian approach to circuit QED measurement with moderate bandwidth
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• Null Values and Quantum State Discrimination
• Measuring cotunneling in its wake
• Analysis of Bell inequality violation in superconducting qubits
• Quantum transfer through a non-Markovian environment under frequent measurements and Zeno effect
• Quantum efficiency of binary-outcome detectors of solid-state qubits
• Quantum Bayesian rule for weak measurements of qubits in superconducting circuit QED
• Quantum trajectories under frequent measurements in non-Markovian environment
• Null weak values in multi-level systems
• Many-body manifestation of interaction-free measurement: the Elitzur-Vaidman bomb
• Non-Hermitian description of a superconducting phase qubit measurement