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Optics Communications

Quantum non-demolition measurements with an optical parametric amplifier

Philip J. Cameron-Smith, Matthew J. Collett, Daniel F. Walls

Published Sep 1, 1993• 14 citations
Publisher
DOI
10.1016/0030-4018(93)90480-s

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AIP conference proceedings•Jan 1, 1993•0 citations
Abstract A theoretical scheme is proposed to enhance the sensitivity of force sensors with quantum non-demolition measurement (QND) in an optomechanical setup assisted by four-tone optical driving and an optical parametric amplifier (OPA). With the help of special drive, the system can be simplified as the typical type of QND for force sensing, so that the backaction noise can be evaded to surpass the standard quantum limit. Besides, the added noise can be suppressed owing to the modified optical susceptibility resulting from the OPA. By introducing two oscillators coupling with two charged bodies respectively, the signal can be enhanced with the nonlinearity caused by Coulomb interaction, while the noise presents an exponential decrease. Moreover, considering the homodyne detection effect, the range of system parameters and frequency bands will be broadened. The present investigation may provide a route toward simultaneously evading backaction noise, reducing the mechanical thermal noise, and enhancing the external signal, which can be an alternative design for sensitive devices.
We demonstrate experimentally two devices that can manipulate an information‐carrying light beam below the usual shot‐noise limit. The first one is a type II pulsed optical parametric amplifier, which can duplicate (or, clone) the signal it amplifies. The second one uses semiconductor emitters and receivers, and is able to ‘‘re‐create’’ a light beam after direct detection. Although both devices are amplifiers with large gain, they meet the quantitative criteria for Quantum Non‐Demolition measurements and, thus, operate in the non‐classical regime. They can be used as noiseless amplifying optical taps which, at the same time, can overcome the noise introduced by downstream propagation and detection losses.