Quantum Nondemolition Measurement of a Kicked Qubit

Details Quantum Nondemolition Measurement of a Kicked Qubit Quantum Nondemolition Measurement of a Kicked Qubit

2004-06-22

arxiv.org/abs/cond-mat/0406529v1

Phys. Rev. B 71, 125333 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 1 figure

Scientific paper

10.1103/PhysRevB.71.125333

We propose a quantum nondemolition measurement using a kicked two-state system (qubit). By tuning the waiting time between kicks to be the qubit oscillation period, the kicking apparatus performs a nondemolition measurement. While dephasing is unavoidable, the nondemolition measurement can (1) slow relaxation of diagonal density matrix elements, (2) avoid detector back-action, and (3) allow for a large signal-to-noise ratio. Deviations from the ideal behavior are studied by allowing for detuning of the waiting time, as well as finite-time, noisy pulses. The scheme is illustrated with a double-dot qubit measured by a gate-pulsed quantum point contact.

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