Abstract: Phonon antibunching, refers to the non-classical phenomenon where phonons which are quanta of mechanical vibrations—are emitted or detected with suppressed probability of simultaneous detection. Conventional Phonon Blockade (CPB) structures rely on strong nonlinearity in the Nanomechanical Resonator (NAMR) to create anharmonic energy levels, blocking two-phonon states due to energy mismatch. This strong nonlinearity is very challenging to achieve experimentally and to date the experimental realization of phonon blockades remains an elusive feat.

In this work, we propose a detailed investigation using analytical models and numerical simulations to predict and optimize conditions for phonon antibunching in hybrid coupled NAMR-TLS systems through the framework of cavity optomechanical systems. These coupled resonator systems form what is known as Unconventional Phonon Blockades (UPB) which relaxes the stringent requirement of strong nonlinearity through the phenomenon of quantum interference making it more conducive for experimental realization. We analyse both quadratic and linear coupling and show that even in the case of linear coupling we achieve strong antibunching with relatively high insensitivity to experimental parameters compared to single NAMR-TLS system. We also investigate the prospects of experimental work focused on achieving ground state cooling of high-Q silicon nitride membrane in quantum electromechanical systems through sideband cooling, a critical step towards the goal of single phonon sources.

Event Details
Title: Study of Phonon Antibunching in Hybrid Quantum platforms with experimental prospects using high-Q Silicon Nitride Suspended Membranes
Date: September 07, 2026 at 5:00 PM
Venue: Google Meet (https://meet.google.com/bih-mrdn-zzq)
Speaker: Mr. Bhaskar Kumar (EE21D041)
Guide: Dr. Balaji Srinivasan
Type: PHD seminar

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