On-Demand Storage and Retrieval of Microwave Photons Using a Superconducting Multiresonator Quantum Memory

TL;DR

This paper demonstrates a superconducting multiresonator quantum memory capable of on-demand microwave photon storage and retrieval with tunable bandwidth and preserved phase coherence, advancing quantum information processing.

Contribution

It introduces a superconducting multiresonator quantum memory with tunable bandwidth and on-demand retrieval, achieving up to 12% efficiency at the single-photon level.

Findings

Achieved tunable memory bandwidth from 10 to 55 MHz.

Stored and retrieved weak coherent microwave photons with phase coherence.

Demonstrated on-demand storage of a time-bin flying qubit.

Abstract

A quantum memory that can store quantum states faithfully and retrieve them on demand has wide applications in quantum information science. An efficient quantum memory in the microwave regime working alongside quantum processors based on superconducting quantum circuits may serve as an important architecture for quantum computers. Here we realize on-demand storage and retrieval of weak coherent microwave photon pulses at the single-photon level. We implement a superconducting multi-resonator quantum memory which is composed of a set of frequency-tunable coplanar transmission line (CPW) resonators. By dynamically tuning the resonant frequencies of the resonators, we achieve tunable memory bandwidth from 10 MHz to 55 MHz, with an overall storage efficiency up to 12 % with well preserved phase coherence. We further demonstrate on-demand storage and retrieval of a time-bin flying qubit. This result opens up a prospect to integrate our chip-based quantum memory with the state-of-the-art superconducting quantum circuit technology for quantum information processing.