Nonreciprocal phonon blockade

TL;DR

This paper demonstrates how spin-orbit interactions in a rotating acoustic ring cavity can induce nonreciprocal phonon blockade, enabling unidirectional quantum control and noise isolation in acoustic systems.

Contribution

It introduces a novel method to achieve nonreciprocal phonon blockade using spin-orbit interactions and SiV centers, advancing acoustic quantum device technology.

Findings

Nonreciprocal single- and two-phonon blockade achieved

Directional phonon tunneling demonstrated

Potential for acoustic quantum routing and noise isolation

Abstract

Quantum nonreciprocal devices have received extensive attention in recent years because they can be used to realize unidirectional quantum routing and noise isolation. In this work, we show that the shift of resonance frequencies of propagating phonons induced by spin-orbit interactions (SOI) of phonons in a rotating acoustic ring cavity can be used to realize nonreciprocal phonon blockade. When driving the cavity from different directions, nonreciprocal single-, two-phonon blockade and phonon-induced tunneling can take place by varying the parameters of the system to an appropriate value. To realize phonon blockade, the sublevels of the lower orbit branch of the ground state of silicon-vacancy (SiV) color centers in the diamond membrane are employed to induce self-interactions of phonons in the cavity. This work provides a way to achieve acoustic nonreciprocal devices, such as directional acoustic switches and quantum noise isolation, which may help acoustic information network processing.