Abstract
By adjusting the frequency of the cavity, we perform a microwave reflection measurement and directly probe the coherence and interference effects in a phase-sensitive Josephson parametric amplifier. We demonstrate the shift in the peak and the dip in the reflection spectra of the amplifier, which operates in the phase-sensitive mode. The behavior of the shift can be precisely controlled by tuning the pump power, the frequency of the cavity, and the relative phase between the incident signal and pump field. Theoretical simulations are in good agreement with the experimental results. These results provide an alternative way of controlling the parametric process by adjusting the frequency of the cavity.
Highlights
Interesting phenomena like spectrum splitting are clearly demonstrated in various systems such as optical parametric amplification,2,3 quantum mechanical resonators,4 coupled electromechanical oscillators,5 and coupled optomechanical systems
The effect of the cavity frequency in a parametric amplifier in the microwave domain has not been investigated in detail yet
The frequency of the resonant cavity is tunable with the flux bias, which is applied through an on-chip line inductively coupled to the dc-SQUID
Summary
It has been analyzed that coherence and interference effects between the incident and pump fields play an important role in the phase-sensitive amplification process.1 The effect of the cavity and its coupling to the environment have been demonstrated. The symmetric and asymmetric behaviors of the amplitude spectra can be precisely controlled and modulated by tuning the signal phase and the cavity frequency.
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