@article{KIM,
author = {KIM, M and LEE, K and BUZEK, V},
journal = {PHYSICAL REVIEW A},
pages = {(4302--4307)--(4302--4307)},
title = {AMPLIFICATION OF SUPERPOSITION STATES IN PHASE-SENSITIVE AMPLIFIERS},
volume = {47},
}

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TY  - JOUR
AB  - We study statistical properties of quantum superposition states (Schrodinger-cat states) amplified by phase-sensitive (squeezed) amplifiers. We show that the phase-sensitive amplifier with a properly chosen phase can preserve quantum coherences and nonclassical behavior of the Schrodinger-cat-state input even for a gain factor G larger than 2. In particular, we show that for an even coherent state (CS) phase-sensitive amplifiers can preserve squeezing for G > 2 but simultaneously in the process of amplification the noise added by the amplifier leads to a rapid increase of fluctuations in the photon number. Because of the finite maximum degree of squeezing obtainable for the even CS the maximum gain factor G(m) for which squeezing can still be observed in the output state is finite. The phase-sensitive amplifier with a properly chosen phase can also reduce fluctuations in the photon number of the initial even CS. Nevertheless, one cannot amplify the initial even CS with super-Poissonian photon statistics into the state with sub-Poissonian photon statistics.
AU  - KIM,M
AU  - LEE,K
AU  - BUZEK,V
EP  - 4307
SN  - 1050-2947
SP  - 4302
TI  - AMPLIFICATION OF SUPERPOSITION STATES IN PHASE-SENSITIVE AMPLIFIERS
T2  - PHYSICAL REVIEW A
VL  - 47
ER  - 

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