Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 6: Nano-Optics (Single Quantum Emitters) I
Q 6.4: Vortrag
Montag, 11. März 2019, 11:15–11:30, S SR 112 Maschb.
Single photons, g(2)(0)<1/2, and vacuum — •Peter Grünwald — Escuela de Ingeniería y Ciencias, ITESM, Monterrey, Mexico
In modern quantum technologies, the measurement of a second-order correlation function g(2)(0)<1/2 is used to imply that the source field is a good single-photon light source [1,2]. We analyze and expand on this concept [3]. A quantum state of light having no projection on the single-photon Fock state can not give a value of g(2)(0)<1/2. However, the amplitude of this single-photon projection can be arbitrarily small or large. Instead, we can determine a lower bound on the ratio of single-to-multi-photon emission from g(2)(0)<1/2. For a fixed ratio of single-to-multi-photon emission, g(2)(0) is artificially enhanced by vacuum contributions. We derive an effective second-order correlation function, which takes this enhancement into account, substantially improving the lower bound. The results are applied to theoretical and realized experimental setups and indicate that the quality of solid-state single-photon sources, at least with respect to this criterion, is often underestimated.
References:
[1] P. Michler et al., Science 290, 2282 (2000).
[2] S. Buckley et al., Rep. Prog. Phys. 75, 126503 (2012).
[3] P. Grünwald, arXiv:1711.05897.