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We introduce a filter using a noise-free quantum buffer with large opticalbandwidth that can both filter temporal-spectral modes, as well asinter-convert them and change their frequency. We show that such quantumbuffers optimally filter out temporal-spectral noise; producing identicalsingle-photons from many distinguishable noisy single-photon sources with theminimum required reduction in brightness. We then experimentally demonstrate anoise-free quantum buffer in a warm atomic system that is well matched toquantum dots and can outperform all intensity (incoherent) filtering schemesfor increasing indistinguishability.

Optimal Coherent Filtering for Single Noisy Photons