High Efficiency Storage of Quasi-Classical and Quantum States in Coupled Resonators

TL;DR

This paper introduces an optical model with coupled resonators capable of storing quantum and quasi-classical states with over 99.99% efficiency, robust against certain errors, and extendable to entangled states, useful for quantum memory applications.

Contribution

The paper presents a novel time-dependent coupling protocol for high-efficiency storage of quantum states in coupled resonators, including entangled states, with robustness to errors.

Findings

Achieves storage efficiency above 99.99%

Robust against up to 5% coupling errors

Extensible to entangled state storage

Abstract

We propose an optical model in which both quantum and quasi-classical states can be ideally stored using coupled resonators. The protocol is based on a time-dependent coupling between two cavities, carefully modulated to allow the complete transfer of an external propagating field from one cavity to another. The system maintains high storage efficiency (above $99.99\%$) even when error sources are introduced (up to $5\%$) in the coupling, such as amplitude deviation or a time delay between field propagation and coupling control. Furthermore, this procedure can be extended to store entangled states by considering either a pair of systems or bimodal cavities. Due to its high efficiency, this model may find application in current quantum technologies, such as quantum memories and quantum batteries, which rely on efficient quantum state storage.