Efficient quantum memory for light
Abstract
Storing and retrieving a quantum state of light on demand, without corrupting the information it carries, is an important challenge in the field of quantum information processing. Classical measurement and reconstruction strategies for storing light must necessarily destroy quantum information as a consequence of the Heisenberg uncertainty principle. There has been significant effort directed towards the development of devices-so-called quantum memories-capable of avoiding this penalty. So far, successful demonstrations of non-classical storage and on-demand recall have used atomic vapours and have been limited to low efficiencies, of less than 17 per cent, using weak quantum states with an average photon number of around one. Here we report a low-noise, highly efficient (up to 69 per cent) quantum memory for light that uses a solid-state medium. The device allows the storage and recall of light more faithfully than is possible using a classical memory, for weak coherent states at the single-photon level through to bright states of up to 500 photons. For input coherent states containing on average 30 photons or fewer, the performance exceeded the no-cloning limit. This guaranteed that more information about the inputs was retrieved from the memory than was left behind or destroyed, a feature that will provide security in communications applications.
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The only quantum power required from the client is preparation of each qubit in state |θj〉 and transmission to the server; no quantum memory or ability to perform quantum gates is needed.
“The only quantum power that is required from the client is the preparation of each qubit j in a state | θ j 〉 and the transmission of the qubits to the server - in particular, there is no need for any quantum memory [40] or ability to perform quantum gates.”
From Demonstration of Blind Quantum Computing (2012) · cites this paper as [40]
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- Authors
- Hedges, M. P., Longdell, J. J., Li, Y., & Sellars, M. J.
- Affiliations
- Australian National University (AU)
- University of Otago (NZ)
- Shanxi University (CN)
- Corresponding author
- Hedges, Morgan P.
- Venue
- Nature
- Published
- 2010-06
- Volume
- 465
- Issue
- 7301
- Pages
- 1052-1056
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- OpenAlex
- W2091624980
- Cited by
- 617
- References
- 34
- Citations by year
- 2026: 25 · 2025: 33 · 2024: 28 · 2023: 37 · 2022: 34 · 2021: 44 · 2020: 30 · 2019: 35 · 2018: 29 · 2017: 36 · 2016: 40 · 2015: 44 · 2014: 41 · 2013: 65 · 2012: 36
- FWCI
- 27.50
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- ANU Open Research (Australian National University) (submittedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
- Keywords
- quantum memory, solid-state quantum memory, praseodymium ions, quantum state storage, quantum information processing, quantum communication security
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