Models of reduced-noise, probabilistic linear amplifiers

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Combes, Joshua
Walk, Nathan
Lund, A. P.
Ralph, T. C.
Caves, Carlton
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2016
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Abstract

We construct an amplifier that interpolates between a nondeterministic, immaculate linear amplifier and a deterministic, ideal linear amplifier and beyond to nonideal linear amplifiers. The construction involves cascading an immaculate linear amplifier that has amplitude gain g1 with a (possibly) nonideal linear amplifier that has gain g2. With respect to normally ordered moments, the device has output noise µ 2 (G 2−1) where G = g1g2 is the overall amplitude gain and µ 2 is a noise parameter. When µ 2 ≥ 1, our devices realize ideal (µ 2 = 1) and nonideal (µ 2 > 1) linear amplifiers. When 0 ≤ µ 2 < 1, these devices work effectively only over a restricted region of phase space and with some subunity success probability pX. We investigate the performance of our µ 2 -amplifiers in terms of a gain-corrected probability-fidelity product and the ratio of input to output signal-to-noise ratios corrected for success probability.

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Physical Review A

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93

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© 2016 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.

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Physical Sciences not elsewhere classified

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