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Scientific Article
unige:4174 
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Quantum nondemolition measurement of a kicked qubit |
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| Authors | ||
| Published in | Physical review. B, Condensed matter and materials physics. 2005, vol. 71, no. 125333, 7 | |
| Abstract | 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 investigated 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. | |
| Keywords | Quantum bit — Quantum dots — Density matrix — Matrix elements — Signal-to-noise ratio — Oscillations — Implementation — Quantum nondemolition measurement | |
| Identifiers | arXiv: cond-mat/0406529 | |
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| Citation (ISO format) | JORDAN, Andrew N., BUTTIKER, Markus. Quantum nondemolition measurement of a kicked qubit. In: Physical review. B, Condensed matter and materials physics, 2005, vol. 71, n° 125333, p. 7. doi: 10.1103/PhysRevB.71.125333 https://archive-ouverte.unige.ch/unige:4174 |
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