Quantum storage of entangled telecom-wavelength photons in an erbium-doped optical fibre

By E. Saglamyurek, Jeongwan Jin, V. Verma, M. Shaw, F. Marsili, Sae Woo Nam, D. Oblak, Wolfgang Tittel. Nature Photonics, 2014

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The authors report the storage and retrieval of entangled telecom-wavelength photons in an erbium-doped optical fibre. The realization of a future quantum Internet requires the processing and storage of quantum information at local nodes and interconnecting distant nodes using free-space and fibre-optic links1. Quantum memories for light2 are key elements of such quantum networks. However, to date, neither an atomic quantum memory for non-classical states of light operating at a wavelength compatible with standard telecom fibre infrastructure, nor a fibre-based implementation of a quantum memory, has been reported. Here, we demonstrate the storage and faithful recall of the state of a 1,532 nm wavelength photon entangled with a 795 nm photon, in an ensemble of cryogenically cooled erbium ions doped into a 20-m-long silica fibre, using a photon-echo quantum memory protocol. Despite its currently limited efficiency and storage time, our broadband light–matter interface brings fibre-based quantum networks one step closer to reality.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/cd2f61bcd6b0e0bfe3d010da648626ea6d3d5217

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