Abstract
Indistinguishability between photons is a key requirement for scalable photonic quantum technologies. We experimentally demonstrate that partly distinguishable single photons can be purified to reach near-unity indistinguishability by the process of quantum interference with ancillary photons followed by heralded detection of a subset of them. We report on the indistinguishability of the purified photons by interfering two purified photons and show improvements in the photon indistinguishability of 2.774(3)% in the low-noise regime, and as high as 10.2(5)% in the high-noise regime.
- C. F. D. Faubry, L. Carosini, H. Cao, P. I. Sund, L. M. Hansen, G. Giorgino, A. B. Villadsen, S. N. van den Hoven, P. Logahl, S. Paesani, J. C. Loredo, P. Walther,
Purifying Photon Indistinguishability through Quantum Interference
Physical Review Letters 133 (2024).
