Abstract

The ability to transfer entanglement over large distance is a main requirement for quantum networks. Another fundamental ingredient is the storage of such a quantum state in a quantum memory. To this end a useful resource is a photon pair for which one photon is resonant with the memory while its partner is at a low-loss telecommunication wavelength. We recently presented a photon pair source, compatible with a Pr:YSO solid state memory [1]. The photons have a narrow bandwidth for compatibility with the memory transition. Generating and transmitting qubits based on such photons is not straight forward, as usual implementations as e.g. polarisation qubits suffer distortion in fibres and time-bin qubits on the other hand require long interferometers for qubit analysis due to the long coherence time. Here we report on the implementation of frequency-bin entanglement [2,3] which has neither of these drawbacks.

© 2017 IEEE