Superefficient cascade multiresonator quantum memory

TL;DR

This paper introduces a cascade scheme of broadband quantum memory using high-Q resonators and spin systems, achieving 99.99% efficiency with minimal restrictions on resonator losses.

Contribution

It presents a novel cascade resonator scheme for quantum memory that optimizes parameters for high efficiency over a broad frequency range.

Findings

Achieves 99.99% quantum memory efficiency.

Operates effectively with minimal restrictions on resonator losses.

Provides a broadband quantum memory solution.

Abstract

We propose a cascade scheme of a superefficient broadband quantum memory consisting of four high-Q ring resonators forming a controllable frequency comb and interacting with long-lived spin systems and with a common waveguide. Using the transfer function giving extended matching conditions, the optimization of all spectroscopic parameters of the system for quantum memory in the resonator is carried out. It was shown that our quantum memory scheme does not impose large restrictions on the parameters of losses in resonators and allows to achieve super high efficiency 99.99 % in a wide frequency range.