TY - JOUR
T1 - Observation of parametric amplification and deamplification in a Josephson parametric amplifier
AU - Yurke, B.
AU - Corruccini, L. R.
AU - Kaminsky, P. G.
AU - Rupp, L. W.
AU - Smith, A. D.
AU - Silver, A. H.
AU - Simon, R. W.
AU - Whittaker, E. A.
PY - 1989
Y1 - 1989
N2 - We present the results of an experimental effort to generate squeezed microwave radiation using the phase-sensitive gain of a Josephson parametric amplifier. To facilitate the interpretation of the experimental results, we first present a discussion of the theory of microwave squeezing via Josephson parametric amplifiers. This is followed by a detailed description of the device fabricated for our experiment. Experimental results are then presented for the device used in both the doubly degenerate or four-photon mode and for the degenerate or three-photon mode. We have observed parametric deamplification of signals by more than 8 dB. We have demonstrated squeezing of 4.2-K thermal noise. When operated at 0.1 K, the amplifier exhibits an excess noise of 0.28 K when referred to the input. This is smaller than the vacuum fluctuation noise level Latin small letter h with stroke/2k=0.47 K. The amplifier is thus quieter than a linear phase-insensitive amplifier in principle can be.
AB - We present the results of an experimental effort to generate squeezed microwave radiation using the phase-sensitive gain of a Josephson parametric amplifier. To facilitate the interpretation of the experimental results, we first present a discussion of the theory of microwave squeezing via Josephson parametric amplifiers. This is followed by a detailed description of the device fabricated for our experiment. Experimental results are then presented for the device used in both the doubly degenerate or four-photon mode and for the degenerate or three-photon mode. We have observed parametric deamplification of signals by more than 8 dB. We have demonstrated squeezing of 4.2-K thermal noise. When operated at 0.1 K, the amplifier exhibits an excess noise of 0.28 K when referred to the input. This is smaller than the vacuum fluctuation noise level Latin small letter h with stroke/2k=0.47 K. The amplifier is thus quieter than a linear phase-insensitive amplifier in principle can be.
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U2 - 10.1103/PhysRevA.39.2519
DO - 10.1103/PhysRevA.39.2519
M3 - Article
AN - SCOPUS:5344233744
SN - 1050-2947
VL - 39
SP - 2519
EP - 2533
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 5
ER -