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Among the objectives toward large-scale quantum computation is the quantuminterconnect: a device which uses photons to interface qubits that otherwisecould not interact. However, current approaches require photonsindistinguishable in frequency---a major challenge for systems experiencingdifferent local environments or of different physical compositions altogether.Here we develop an entirely new platform which actually exploits such frequencymismatch for processing quantum information. Labeled "spectral linear opticalquantum computation" (spectral LOQC), our protocol offers favorable linearscaling of optical resources and enjoys an unprecedented degree of parallelism,as an arbitrary $N$-qubit quantum gate may be performed in parallel on multiple$N$-qubit sets in the same linear optical device. Not only does spectral LOQCoffer new potential for optical interconnects; it also brings the ubiquitoustechnology of high-speed fiber optics to bear on photonic quantum information,making wavelength-configurable and robust optical quantum systems within reach.

Frequency-encoded photonic qubits for scalable quantum information processing