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A proposal for fast-switching broadband frequency-shifting technology makinguse of frequency conversion in a nonlinear crystal is set forth, whereby theshifting is imparted to the converted photons by creating a bank offrequency-displaced pump modes that can be selected by a photonic switch anddirected to the nonlinear crystal. Proof-of-principle results show that theexpected frequency-shifting operation can be achieved. Even though thedimensions of the currently employed crystal and significant excess loss in theexperimental setup prevented conversion of single-photon-level inputs, thoroughexperimental and theoretical analysis of the noise contribution allowed for theestimation of the system performance in an optimized scenario, where theexpected signal-to-noise ratio for single-photon conversion andfrequency-shifting can reach up to 25 dB with proper narrow-band filtering andstate-of-the-art devices. The proposed frequency-shifting solution figures as apromising candidate for applications in frequency-multiplexed quantum repeaterarchitectures with 25 dB output SNR (with 20\% conversion efficiency) andcapacity for 16 channels spread around a 100 GHz spectral region.

Proposal and Proof-of-Principle Demonstration of Fast-Switching Broadband Frequency-Shifting for a Frequency-Multiplexed Quantum Repeater