Abstract
High-visibility quantum interference (indistinguishability) among single photons is the key to scalable, high-fidelity linear optical quantum gates. Measuring indistinguishability by interference is laborious and time-consuming, though, and thus not scalable. The authors find that the faster, simpler second-order correlation functions provide results equivalent to the indistinguishability, and could be useful in rapid-prototyping source design of large-scale photonic circuits. Also, for mature guided-wave integrated optics such as silicon photonics, the high-visibility bottleneck is due to the physics of a process that tends to produce single photons in multiple spectral modes.
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