TY - JOUR
AU - M. Malnou
AU - Daniel Palken
AU - Leila Vale
AU - Gene Hilton
AU - Konrad Lehnert
AB - A Josephson parametric amplifier (JPA) can create squeezed states of microwave light, lowering the noise associated with certain quantum measurements. We experimentally study how the JPA’s pump influences the phase-sensitive amplification and deamplification of a coherent tone’s amplitude when that amplitude is commensurate with vacuum fluctuations. We predict and demonstrate that, by operating the JPA with a single current pump whose power is greater than the value that maximizes gain, the amplifier distortion is reduced and, consequently, squeezing is improved. Optimizing the singly pumped JPA’s operation in this fashion, we directly observe 3.87 ± 0.03 dB of vacuum squeezing over a bandwidth of 30 MHz.
BT - Physical Review Applied
DA - 2018-04
DO - 10.1103/PhysRevApplied.9.044023
N2 - A Josephson parametric amplifier (JPA) can create squeezed states of microwave light, lowering the noise associated with certain quantum measurements. We experimentally study how the JPA’s pump influences the phase-sensitive amplification and deamplification of a coherent tone’s amplitude when that amplitude is commensurate with vacuum fluctuations. We predict and demonstrate that, by operating the JPA with a single current pump whose power is greater than the value that maximizes gain, the amplifier distortion is reduced and, consequently, squeezing is improved. Optimizing the singly pumped JPA’s operation in this fashion, we directly observe 3.87 ± 0.03 dB of vacuum squeezing over a bandwidth of 30 MHz.
PY - 2018
T2 - Physical Review Applied
TI - Optimal Operation of a Josephson Parametric Amplifier for Vacuum Squeezing
VL - 9
ER -