Phonon Blockade in Parametrically Pumped Acoustic Cavity at Finite Temperature

Abstract

In this study, we investigated the phonon blockade effect in a parametrically driven and dissipative acoustic cavity at finite temperature. With the approximated analytical results based on the steady-state density-matrix master equation, we found that a quantum-interference-induced phonon blockade exists at finite temperature. We found a crossover between the quantum and thermal regimes on the curve of the second-order correlation function of the acoustic mode as the temperature increases. This phenomenon implies an asymmetry about the quantum and classic regimes. We also numerically simulated the single-phonon emission using the Monte Carlo wave function method. The results showed that a wide and deep dip around the zero time delay exists on the curve of the time-delayed second-order correlation function, which implies the possibility of observing a strong phonon blockade with pulse driving. Our study outlines a potential candidate for a efficient single-phonon source and applications in quantum information and phononic quantum networks.

Phonon Blockade in a Hybrid Quadratically Coupled Optomechanical System

“…When the driving strength becomes strong enough, the quantum interference finally dominates the phonons behavior and thus the phonons re-exhibit the antibunching effect. [52,53] That's why the UCPB can be retained with proper driving strength under certain thermal phonon numbers. However, when the driving strength goes up, higher phonon excitations are generated, and thus phonons tend to behave classically, resulting in the g (2) (0) increasing again.…”