Single-photon-level quantum image memory based on cold atomic ensembles
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TLDR
The experiments show that the non-classical pair correlation between trigger photon and retrieved photon is retained, and the spatial structure of input and retrieved photons exhibits strong similarity, and it is demonstrated that single-photon coherence is preserved during storage.Abstract:
A quantum memory is a key component for quantum networks, which will enable the distribution of quantum information. Its successful development requires storage of single-photon light. Encoding photons with spatial shape through higher-dimensional states significantly increases their information-carrying capability and network capacity. However, constructing such quantum memories is challenging. Here we report the first experimental realization of a true single-photon-carrying orbital angular momentum stored via electromagnetically induced transparency in a cold atomic ensemble. Our experiments show that the non-classical pair correlation between trigger photon and retrieved photon is retained, and the spatial structure of input and retrieved photons exhibits strong similarity. More importantly, we demonstrate that single-photon coherence is preserved during storage. The ability to store spatial structure at the single-photon level opens the possibility for high-dimensional quantum memories.read more
Citations
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Photonic quantum information processing: a review
TL;DR: A comprehensive review of the state of the art in this active field, with a due balance between theoretical, experimental and technological results, can be found in this article, where significant achievements are presented in tables or in schematic figures, in order to convey a global perspective of the several horizons that fall under the name of photonic quantum information.
Journal ArticleDOI
A quantum memory for orbital angular momentum photonic qubits
TL;DR: In this paper, a quantum memory for orbital angular momentum qubits is demonstrated in the single-photon regime, based on cold cesium atoms and the dynamic electromagnetically induced transparency protocol.
Journal ArticleDOI
Quantum memories: emerging applications and recent advances.
Khabat Heshami,Duncan G. England,Peter C. Humphreys,Philip J. Bustard,Victor M. Acosta,Joshua Nunn,Benjamin J. Sussman +6 more
TL;DR: Some of the emerging applications of quantum memories in optical signal processing, quantum computation and non-linear optics are outlined.
Journal ArticleDOI
Photonic quantum information processing: a review
TL;DR: The goal of this manuscript is to provide the reader with a comprehensive review of the state of the art in this active field with a due balance between theoretical, experimental and technological results.
Journal ArticleDOI
Prospective applications of optical quantum memories
Félix Bussières,Nicolas Sangouard,Mikael Afzelius,Hugues de Riedmatten,Christoph Simon,Wolfgang Tittel +5 more
TL;DR: In this article, the authors review several prospective applications of optical quantum memories, as well as recent experimental achievements pertaining to these applications, and highlight that optical quantum memory has become essential for the development of quantum information processing.
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Free-space information transfer using light beams carrying orbital angular momentum
Graham M. Gibson,Johannes Courtial,Miles J. Padgett,Mikhail V. Vasnetsov,V. A. Pas’ko,Stephen M. Barnett,Sonja Franke-Arnold +6 more
TL;DR: The transfer of information encoded as orbital angular momentum states of a light beam is demonstrated, which is resistant to eavesdropping and gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM.
Journal ArticleDOI
Entanglement of Orbital Angular Momentum States of Photons
TL;DR: In this article, the orbital angular momentum of photons is exploited to achieve multi-dimensional entanglement in higher dimensions, i.e., the state of the electromagnetic field with phase singularities (doughnut modes).
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Experimental Evidence for a Photon Anticorrelation Effect on a Beam Splitter: A New Light on Single-Photon Interferences
TL;DR: In this article, the authors report on two experiments using an atomic cascade as a light source, and a triggered detection scheme for the second photon of the cascade, which is in contradiction with any classical wave model of light but in agreement with a quantum description involving single-photon states.