High-efficiency quantum state transfer and quantum memory using a mechanical oscillator

TL;DR

This paper demonstrates a method for high-efficiency quantum state transfer and memory using optomechanical systems, achieving over 99% transfer efficiency and 96% memory efficiency through adjustable damping and interference.

Contribution

It introduces a scheme for efficient quantum state transfer and memory in optomechanical systems with moderate mechanical Q-factors, highlighting the role of cavity damping and interference.

Findings

Achieves 99.4% quantum state transfer efficiency.

Demonstrates 96% quantum memory efficiency.

Shows mechanical dissipation effects can be mitigated.

Abstract

We analyze an optomechanical system that can be used to efficiently transfer a quantum state between an optical cavity and a distant mechanical oscillator coupled to a second optical cavity. We show that for a moderate mechanical Q-factor it is possible to achieve a transfer efficiency of $99.4\%$ by using adjustable cavity damping rates and destructive interference. We also show that the quantum mechanical oscillator can be used as a quantum memory device with an efficiency of $96\%$ employing a pulsed optomechanical coupling. Although the mechanical dissipation slightly decreases the efficiency, its effect can be significantly reduced by designing a high-Q mechanical oscillator.