Stochastic quantum trajectories in a QND measurement of photon number

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377610702001X· OSTI ID:21072539

Kilin, S Ya ^[1]

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1. National Academy of Sciences of Belarus, Stepanov Institute of Physics (Belarus)

An analysis is presented of the time evolution of an optical field during a quantum nondemolition measurement of photon number using the cross-Kerr interaction between the signal and probe fields. It is shown that the signal field state collapses into a Fock state only asymptotically (in the infinite time limit), remaining in a superposition of two Fock states (Fock-state qubit) throughout most of the measurement period. Estimates are obtained both for the time required to measure photon number to the desired accuracy and for the Fock-state qubit lifetime.

• OSTI ID: 21072539
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 104, Issue 2; Other Information: DOI: 10.1134/S106377610702001X; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INFORMATION THEORY
INTERACTIONS
LIFETIME
MATHEMATICAL EVOLUTION
PHOTONS
QUANTUM MECHANICS
QUBITS
SIGNALS
STOCHASTIC PROCESSES
TRAJECTORIES