4.8 Article

A quantum memory for orbital angular momentum photonic qubits

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NATURE PHOTONICS
卷 8, 期 3, 页码 234-238

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NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.355

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  1. ERA-Net CHIST-ERA (QScale)
  2. ERA-Net. RUS (Nanoquint)
  3. Institut Francilien de Recherche sur les Atomes Froids (IFRAF)
  4. European Research Council (ERC)
  5. Direction Generale de l'Armement (DGA)

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Among the optical degrees of freedom, the orbital angular momentum of light(1) provides unique properties(2), including mechanical torque action, which has applications for light manipulation(3), enhanced sensitivity in imaging techniques(4) and potential high-density information coding for optical communication systems(5). Recent years have also seen a tremendous interest in exploiting orbital angular momentum at the single-photon level in quantum information technologies(6,7). In pursuing this endeavour, we demonstrate here the implementation of a quantum memory(8) for quantum bits encoded in this optical degree of freedom. We generate various qubits with computer-controlled holograms, store and retrieve them on demand using a dynamic electromagnetically induced transparency protocol. We further analyse the retrieved states by quantum tomography and thereby demonstrate fidelities exceeding the classical benchmark, confirming the quantum functioning of our storage process. Our results provide an essential capability for future networks(9) exploring the promises of orbital angular momentum of photons for quantum information applications.

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