State-dependent impedance of a strongly coupled oscillator-qubit system

Details State-dependent impedance of a strongly coupled oscillator-qubit system State-dependent impedance of a strongly coupled oscillator-qubit system

2005-01-04

arxiv.org/abs/cond-mat/0501043v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 16 images

Scientific paper

10.1103/PhysRevB.72.054502

We investigate the measurements of two-state quantum systems (qubits) at finite temperatures using a resonant harmonic oscillator as a quantum probe. The reduced density matrix and oscillator correlators are calculated by a scheme combining numerical methods with an analytical perturbation theory. Correlators provide us information about the system impedance, which depends on the qubit state. We show in detail how this property can be exploited in the qubit measurement.

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