Efficient, ever-ready quantum memory at room temperature for single photons

Efficient quantum memories will be an essential building block of large scale networked quantum systems and provide a link between flying photonic qubits and atomic or quasi-atomic local quantum processors. To provide a path to scalability avoidance of bulky, difficult to maintain systems such as hi...

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Bibliographic Details
Published in:arXiv.org 2022-03
Main Authors: Leung, Anthony C, Lau, W Y Sarah, Tranter, Aaron D, Paul, Karun V, Rambach, Markus, Buchler, Ben C, Ping Koy Lam, White, Andrew G, Weinhold, Till J
Format: Article
Language:English
Subjects:
Cloning
High vacuum
Low temperature
Optical memory (data storage)
Photons
Quantum phenomena
Qubits (quantum computing)
Room temperature
Rubidium
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Summary:Efficient quantum memories will be an essential building block of large scale networked quantum systems and provide a link between flying photonic qubits and atomic or quasi-atomic local quantum processors. To provide a path to scalability avoidance of bulky, difficult to maintain systems such as high vacuum and low temperature cryogenics is imperative. Memory efficiencies above 50% are required to be operating above the quantum no-cloning limit. Such high efficiencies have only been achieved in systems with photon sources tailored to the memory bandwidth. In this paper we explore the combination of an ultralow spectral bandwidth source of single photons from cavity-enhanced spontaneous parametric down-conversion with a gas-ensemble atomic memory. Our rubidium vapour gradient echo memory achieves 84\(\pm\)3% recall efficiency of single photons: a record for an always-ready, hot, and vacuum system free optical memory.
ISSN:2331-8422