Abstract
Long-lifetime quantum storages accessible to the telecom photonic infrastructure are essential to long-distance quantum communication. Atomic quantum storages have achieved subsecond storage time corresponding to 1000 km transmission time for a telecom photon through a quantum repeater algorithm. However, the telecom photon cannot be directly interfaced to typical atomic storages. Solid-state quantum frequency conversions fill this wavelength gap. Here we report on the experimental demonstration of a polarization-insensitive solid-state quantum frequency conversion to a telecom photon from a short-wavelength photon entangled with an atomic ensemble. Atom–photon entanglement has been generated with a Rb atomic ensemble and the photon has been translated to telecom range while retaining the entanglement by our nonlinear-crystal-based frequency converter in a Sagnac interferometer.
Highlights
Long-lifetime quantum storages accessible to the telecom photonic infrastructure are essential to long-distance quantum communication
For long-distance quantum communication with quantum repeater algorithms[30,31,32], a long lifetime quantum storage system that can be entangled with a telecom photon is necessary
Our solid-state polarization-insensitive QFC (PIQFC) device consists of a waveguided periodically poled lithium niobate (PPLN) crystal installed in a Sagnac interferometer
Summary
Long-lifetime quantum storages accessible to the telecom photonic infrastructure are essential to long-distance quantum communication. We report on the experimental demonstration of a polarizationinsensitive solid-state quantum frequency conversion to a telecom photon from a shortwavelength photon entangled with an atomic ensemble. One could use QFC for other purposes such as erasing distinguishability of photons[14], manipulating spectral and temporal modes of photons[15,16,17,18,19,20,21,22,23], and performing frequency-domain quantum information processing[24,25,26] by tailoring of the pump light Most of those abilities have been demonstrated with solid-state QFC devices because of its applicability to a wide frequency range, analogously to mirrors and beamsplitters (BSs) for the spatial manipulation of the photons. The demonstration of interface between telecom photons and a good quantum storage is a key ingredient in the future quantum network technology
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