Quantum analysis of second-order effects in superconducting travelling-wave parametric amplifiers
Songyuan Zhao,
Stafford Withington
Abstract:We have performed a quantum mechanical analysis of travelling-wave parametric amplifiers (TW-PAs) in order to investigate five experimental phenomena related to their operations, namely the effect of impedance mismatch, the presence of upper idler modes, the presence of quantum and thermal noise, the generation of squeezed states, and the preservation of pre-squeezed states during amplification. Our analysis uses momentum operators to describe the spatial evolution of quantised modes along a TWPA. We calculate… Show more
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