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Light Sci Appl. 2016 Jan 29;5(1):e16019. doi: 10.1038/lsa.2016.19. eCollection 2016 Jan.

Orbital angular momentum photonic quantum interface.

Zhou ZY1,2, Li Y1,2, Ding DS1,2, Zhang W1,2, Shi S1,2, Shi BS1,2, Guo GC1,2.

Author information

1
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China.
2
Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Abstract

Light-carrying orbital angular momentum (OAM) has great potential in enhancing the information channel capacity in both classical and quantum optical communications. Long distance optical communication requires the wavelengths of light are situated in the low-loss communication windows, but most quantum memories currently being developed for use in a quantum repeater work at different wavelengths, so a quantum interface to bridge the wavelength gap is necessary. So far, such an interface for OAM-carried light has not been realized yet. Here, we report the first experimental realization of a quantum interface for a heralded single photon carrying OAM using a nonlinear crystal in an optical cavity. The spatial structures of input and output photons exhibit strong similarity. More importantly, single-photon coherence is preserved during up-conversion as demonstrated.

KEYWORDS:

frequency conversion; orbital angular momentum; spontaneous parametric down conversion; sum frequency generation

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