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International Journal of Theoretical Physics

Nondestructive Probing Scheme of Quantum State Without Quantum Correlation

Zhenni Li, Chang‐shui Yu, Shu-Xue Ding, Zunyi Tang

Published Jun 7, 2013• 0 citations
Publisher
DOI
10.1007/s10773-013-1673-5

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We present a two-tone heterodyne optical readout scheme to extract unequal-time density correlations along an arbitrary stationary interaction path from a pancake-shaped Bose-Einstein condensate, using a modulated laser probe. Analyzing the measurement noise both from imprecision and backaction, we identify the standard quantum limit for the signal-extraction scheme, and examine how a class of two-mode squeezed initial states can be used to push beyond this limit. As an application, we show how the readout scheme can be used for an experimentally feasible realization of acceleration dependence of quantum-vacuum fluctuations in the system, including the analog spacetime circular motion Unruh effect. The scheme is adaptable beyond Bose-Einstein condensates, providing nondestructive access to unequal-time correlations in quantum fluids.