Polarization-entangled photon pairs from a single molecule

Mohammad Rezai; Guilherme Stein; Vladislav Bushmakin; Jörg Wrachtrup; Ilja Gerhardt

doi:10.1117/12.2516608

1 March 2019 Polarization-entangled photon pairs from a single molecule

Mohammad Rezai, Guilherme Stein, Vladislav Bushmakin, Jörg Wrachtrup, Ilja Gerhardt

Proceedings Volume 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology; 109342Q (2019) https://doi.org/10.1117/12.2516608
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Single organic dye molecules have been studied for almost three decades. A majority of experiments are now conducted under ambient conditions and aim towards material science and micro-biology. The experiments under cryogenic conditions are often based on highly rigid polycyclic hydrocarbons, which have excellent fluorescing properties when they are operated at temperatures below 2 K. Their photonic advantages integrate their high flux, their narrow-band nature and their tunability over the entire visible spectrum. Therefore the use of organic molecules as efficient and narrow-band single photon sources facilitated a number of quantum optical advances in the past years. The results mostly cover quantum sensing, the formation of quantum hybrid systems and the optical combination of multiple photons in all-optical experiments. Here we present all three fields and outline our own experiments in the combination of single molecule studies, atomic spectroscopy and entanglement generation. The brightness and the narrow-band nature of the molecules are outlined and a delayed-choice quantum eraser is presented. The mode-mixing of two photons on a beam-splitter allows for the generation of a degenerate photon pair, which is resonant to the sodium D₂-line. Furthermore, its spectral width matches roughly to the natural linewidth of an isolated sodium atom, such that further experiments are feasible. The entanglement of the post-selected photon pair is testified by a violation of Bell's inequality. Even the raw collected clicks violate Bell's inequality by more than two standard deviations.

Citation Download Citation

Mohammad Rezai, Guilherme Stein, Vladislav Bushmakin, Jörg Wrachtrup, and Ilja Gerhardt "Polarization-entangled photon pairs from a single molecule", Proc. SPIE 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, 109342Q (1 March 2019); https://doi.org/10.1117/12.2516608

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