Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Research in Optical Sciences

Creating narrow-band single photons suitable for gradient echo quantum memories

Till J. Weinhold, Markus Rambach, Andrew G. White

Published Jan 1, 2014• 0 citations
Publisher

Abstract

Quantum memories are essential for quantum data processing. Efficient storage requires tailoring matched bandwidths for memory and photons. Gradient Echo Memory is the most efficient memory to-date. Here we present our cavity enhanced down-conversion source tailored for this memory.
DOI
10.1364/hilas.2014.jw2a.36

Related papers

Creating narrow-band single photons suitable for gradient echo quantum memories

Till J. Weinhold, Matthew A. Broom, Andrew G. White

Quantum memories are essential for quantum data processing. Most suggested approaches rely on storage in atomic media, with bandwidths much narrower than those of the single photons used in quantum communication. We present our work on a cavity based system tailored to generate the narrowest photons from parametric down-conversion to date, suitable for storage in gradient echo memories.

•Jan 1, 2011•0 citations

Creating narrow-band single photons suitable for gradient echo quantum memories

Till J. Weinhold, Matthew A. Broom, Andrew G. White

Quantum memories are essential for quantum data processing. Most suggested approaches rely on storage in atomic media, with bandwidths much narrower than those of the single photons used in quantum communication. We present our work on a cavity based system tailored to generate the narrowest photons from parametric down-conversion to date, suitable for storage in gradient echo memories.

•Aug 1, 2011•0 citations

Highly efficient storage of cavity SPDC single photons in room temperature gradient echo memory

Anthony C. Leung, W. Y. Sarah Lau, Aaron D. Tranter +6 more

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. Memory efficiencies above 50% are required to be operating above the quantum no-cloning limit. High efficiency operation necessitates tailored photon source and memory pairs with matched bandwidths. 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 hot gas-ensemble atomic memory. Our rubidium vapor gradient echo memory achieves 84% ± 3% recall efficiency of single photons: a record for single photon storage in a warm vapor platform that avoids bulky and complex systems, such as high vacuum and low temperature cryogenics.

APL Quantum•Jul 11, 2024•6 citations

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

Anthony C. Leung, W. Y. Sarah Lau, Aaron D. Tranter +6 more

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.

arXiv:2203.12108•Mar 23, 2022•0 citations

Extending gradient echo memory using machine learning and single photons

Anthony C. Leung, Aaron D. Tranter, Karun Paul +6 more

Gradient echo memory is the most efficient quantum memory protocol to date. Recent additions of machine learning and compatible single photons can raise its performance and the possibility of using it as a quantum gate.

•Jan 1, 2018•1 citation

Generation of Narrow-band Photon Pairs for Solid-state Quantum Memories

Jiachen Liu, Jianji Liu, Xinge Wang +1 more

We achieve a narrow-band frequency-entangled photon-pair source using the cavity-enhanced spontaneous parametric down conversion. The bandwidth of photon pairs is 1.07 MHz at 605.78 nm, which could be used for Pr3+ based quantum memory.

Conference on Lasers and Electro-Optics•Jan 1, 2020•0 citations
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. Memory efficiencies above 50% are required to be operating above the quantum no-cloning limit. High efficiency operation necessitates tailored photon source and memory pairs with matched bandwidths. 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 hot gas-ensemble atomic memory. Our rubidium vapor gradient echo memory achieves 84% ± 3% recall efficiency of single photons: a record for single photon storage in a warm vapor platform that avoids bulky and complex systems, such as high vacuum and low temperature cryogenics.
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.