Speaker
Description
Phonon antibunching or phonon blockade effect (PBE), a hallmark of quantum mechanical behavior in vibrational systems, offers promising prospects in quantum information processing and phonon-based quantum computing. In this work, we explore the phenomenon of phonon antibunching in a system comprising two coupled nanomechanical resonators (NAMRs) interacting with a two-level system (TLS). We derive the system's Hamiltonian and analyze the antibunching behavior by numerically simulating the second-order correlation function using the Lindblad master equation. By examining the second-order correlation function, we demonstrate phonon antibunching that arises from quantum interference between distinct excitation pathways. The key features highlighting our work is due to the presence of two different coupling mechanisms. The first NAMR is linearly coupled to the second NAMR, which has a weak Duffing nonlinearity, while the second NAMR is quadratically coupled to the TLS. The system leverages the interplay between the two different coupling mechanisms to achieve a strong antibunching effect even in a weak coupling regime. The optimal antibunching conditions are achieved by tuning the coupling strength and detuning parameters between the resonators and the TLS. Moreover, by tuning the phase difference and amplitude of two external driving fields, destructive interference between the two-phonon excitation can be maximized, enhancing the PBE. We also show the temperature resilience of the design by analyzing its robustness against thermal noise induced by temperature variations. This study provides a framework for achieving strong phonon antibunching in coupled resonator-TLS systems, paving the way for the experimental realization of single-phonon sources and advancing quantum acoustics applications.
