Microwave quantum memory promises advanced capabilities for noisy intermediate-scale superconducting quantum computers. Existing approaches to microwave quantum memory lack complete combination of high efficiency, long storage time, noiselessness and multi-qubit capacity. Here we report an efficient microwave broadband multimode quantum memory. The memory stores two spectral modes of single photon level microwave radiation in on-chip system of eight coplanar superconducting resonators. Single mode storage shows a power efficiency of up to 60±3% at single photon energy and more than 73±3% at higher intensity. The demonstrated efficiency is an order of magnitude larger than the previously reported multimode microwave quantum memory. The noiseless character of the storage is confirmed by coherent state quantum process tomography. The demonstrated results pave the way to further increase in efficiency and hence building a practical multimode microwave memory for superconducting quantum circuits.
@article{arxiv.2207.14092,
title = {Towards highly efficient broadband superconducting quantum memory},
author = {A. R. Matanin and K. I. Gerasimov and E. S. Moiseev and N. S. Smirnov and A. I. Ivanov and E. I. Malevannaya and V. I. Polozov and E. V. Zikiy and A. A. Samoilov and I. A. Rodionov and S. A. Moiseev},
journal= {arXiv preprint arXiv:2207.14092},
year = {2023}
}