Superefficient cascade multiresonator quantum memory

Abstract

We propose a cascade scheme of a superefficient broadband quantum memory consisting of four high-Q ring resonators forming a controllable frequency comb, interacting with long-lived spin systems and 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 the achievement of a super high efficiency ∼99.99% in a wide frequency range.