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The ability to manipulate single photons is of critical importance forfundamental quantum optics studies and practical implementations of quantumcommunications. While extraordinary progresses have been made in controllingspatial, temporal, spin and orbit angular momentum degrees of freedom,frequency-domain control of single photons so far relies on nonlinear opticaleffects, which have faced obstacles such as noise photons, narrow bandwidth anddemanding optical filtering. Here we demonstrate the first integratednear-unity efficiency frequency manipulation of single photons, by stretchingand compressing a waveguide at 8.3 billion cycles per second. Frequency shiftup to 150 GHz at telecom wavelength is realized without measurable added noiseand the preservation of quantum coherence is verified through quantuminterference between twin photons of different colors. This single photonfrequency control approach will be invaluable for increasing the channelcapacity of quantum communications and compensating frequency mismatch betweenquantum systems, paving the road toward hybrid quantum network.

Noise-free quantum optical frequency shifting driven by mechanics