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Bulletin of the American Physical Society

Using an Optical Parametric Amplifier as a Noiseless Attenuator

R. A. Brewster, J. D. Franson

Published Mar 8, 2018• 0 citations
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The process of heralded noiseless amplification, and the inverse process of heralded noiseless attenuation, have potential applications in the context of quantum communications. Although several different physical implementations of heralded noiseless amplifiers have now been demonstrated, the research on heralded noiseless attenuators has been largely confined to a beam-splitter based approach. Here we show that an optical parametric amplifier (OPA), combined with appropriate heralding, can also serve as a heralded noiseless attenuator. The counterintuitive use of an optical amplifier as an attenuator is only possible due to the probabilistic nature of the device.

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Summary form only given. Optical imaging is one of the important potential applications for nonclassic states of light. It has been shown that spatially broadband squeezed light can be used to image faint objects with sub-shot-noise sensitivity. Broad spatial bandwidth of an optical parametric amplifier (OPA), determined by phase-matching conditions, makes it a good choice for studying the feasibility of imaging with nonclassic states. Here, we report, to our knowledge, the first observation of noiseless amplification of an image by means of phase-sensitive parametric amplification.

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Noiseless optical amplification–a non-classical process in which a weak optical signal may be amplified without any degradation in the signal to noise ratio (SNR)–is generating interest in the telecommunications community. Although successfully demonstrated in bulk KTP crystals1, practical applications are severely hampered by the enormous pump-field strength required to obtain a sizeable gain. Efforts to reduce this requirement are centred on the search for better non-linear materials and stronger confinement of the interacting fields. In this article a noiseless optical parametric amplifier (OPA) is demonstrated with tightly-focused incident fields in quasi-phase-matched (QPM) lithium niobate (LiNbO3), for the first time. The quantum noise properties are analysed within a quantised field framework which reveals a strong similarity between guided and free wave interactions.

Nonlinear Guided Waves and Their Applications•Jan 1, 1996•0 citations
The process of heralded noiseless amplification, and the inverse process of heralded noiseless attenuation, have potential applications in the context of quantum communications. Although several different physical implementations of heralded noiseless amplifiers have now been demonstrated, the research on heralded noiseless attenuators has been largely confined to a beam-splitter based approach. Here we show that an optical parametric amplifier (OPA), combined with appropriate heralding, can also serve as a heralded noiseless attenuator. The counterintuitive use of an optical amplifier as an attenuator is only possible due to the probabilistic nature of the device.
Summary form only given. Optical imaging is one of the important potential applications for nonclassic states of light. It has been shown that spatially broadband squeezed light can be used to image faint objects with sub-shot-noise sensitivity. Broad spatial bandwidth of an optical parametric amplifier (OPA), determined by phase-matching conditions, makes it a good choice for studying the feasibility of imaging with nonclassic states. Here, we report, to our knowledge, the first observation of noiseless amplification of an image by means of phase-sensitive parametric amplification.
Noiseless optical amplification–a non-classical process in which a weak optical signal may be amplified without any degradation in the signal to noise ratio (SNR)–is generating interest in the telecommunications community. Although successfully demonstrated in bulk KTP crystals1, practical applications are severely hampered by the enormous pump-field strength required to obtain a sizeable gain. Efforts to reduce this requirement are centred on the search for better non-linear materials and stronger confinement of the interacting fields. In this article a noiseless optical parametric amplifier (OPA) is demonstrated with tightly-focused incident fields in quasi-phase-matched (QPM) lithium niobate (LiNbO3), for the first time. The quantum noise properties are analysed within a quantised field framework which reveals a strong similarity between guided and free wave interactions.