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Bulletin of the American Physical Society

Random-access microwave quantum memory using chirped pulse phase encoding

Oscar W. Kennedy, James O’Sullivan, Joseph Alexander, Kamanasish Debnath, Chris Thomas, Christoph W. Zollitsch, Mantas Šimėnas, Akel Hashim, S. Withington, Irfan A. Siddiqi, Klaus Mølmer, John J. L. Morton

Published Mar 17, 2021• 0 citations
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A photonic quantum memory that can store multiple qubits and later recall any randomly chosen subset is essential for large-scale quantum networking and computing. This capability, similar to random-access memory in classical computers, has been difficult to achieve due to the lack of a versatile random-access mechanism and the limited multi-mode storage capacity of existing quantum memory protocols. One promising route uses photon-echo protocols, which apply optical rephasing pulses to selectively read out frequency-multiplexed photonic qubits within a broadened optical transition. Here we advance a photon-echo-based quantum memory protocol using linearly swept adiabatic rephasing pulses, which imprint phase shifts to suppress unwanted echoes. Using the optical transitions of a 171Yb3+:Y2SiO5 crystal, we demonstrate storage and retrieval of multiple complex spectro-temporal photonic modes and achieve random-access memory across eight distinct spectral modes. We show enhanced mode-mapping versatility while substantially lowering the required rephasing pulse intensity, providing a more efficient and reliable approach for high-fidelity qubit storage and retrieval. Scalable quantum networks require memories that store photonic qubits while allowing selective access to individual states, a capability not currently available. A chirped-pulse phase-encoding approach provides random access to spectro-temporal-multiplexed information, enabling storage and retrieval across eight spectral modes with lower rephasing pulse intensity.