Optimal Coherent Filtering for Single Noisy Photons

Gao, S., Lazo-Arjona, O., Brecht, B., Kaczmarek, K. T., Thomas, S. E., Nunn, J., Ledingham, P. M., Saunders, D. J. and Walmsley, I. A. (2019) Optimal Coherent Filtering for Single Noisy Photons. Physical Review Letters, 123 (21), [213604]. (doi:10.1103/PhysRevLett.123.213604).

Abstract

We introduce a filter using a noise-free quantum buffer with large optical bandwidth that can both filter temporal-spectral modes as well as interconvert them and change their frequency. We theoretically show that such quantum buffers optimally filter out temporal-spectral noise, producing identical single photons from many distinguishable noisy single-photon sources with the minimum required reduction in brightness. We then experimentally demonstrate a noise-free quantum buffer in a warm atomic system that is well matched to quantum dots. Based on these experiments, simulations show that our buffer can outperform all intensity (incoherent) filtering schemes for increasing indistinguishability.

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Contributors

Author: P. M. Ledingham

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