Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Focus Session: Quantum Nanophotonics in Solid State Systems II (joint session HL/TT)
TT 56.8: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, EW 201
Two-photon interference with remote quantum dots at 1550 nm after quantum frequency conversion — •J. H. Weber1, B. Kambs2, J. Kettler1, S. Kern1, H. Vural1, J. Maisch1, S. L. Portalupi1, M. Jetter1, C. Becher2, and P. Michler1 — 1IHFG, IQST Center and SCoPE, Universität Stuttgart — 2Fachrichtung Physik, Universität des Saarlandes
Two-photon interference (TPI) with telecom photons from remote quantum emitters is of key importance for future long-distance quantum networking. Here, quantum frequency conversion (QFC) is exploited to transfer single near-infrared photons from semiconductor quantum dots to the telecom C-band. We demonstrate that the presented technology opens the path for on-demand generation of highly bright single-photon emission at 1550 nm without the need for special sample design or intrinsic tuning mechanisms. Standing prove for the feasibility of this hybrid technology, we report on TPI with remote quantum dots, being only limited to spectral wandering due to the charge environment of the bulk material. The feasibility of this technology is further strengthened by unprecedented overlap of measured TPI contrast and theoretical prediction which is only possible due to the convenient and highly stable tuning mechanism delivered by QFC. With this respect, the theoretical derivations consider both off-resonant TPI as well as inhomogeneous broadening and blinking of the emitters. Finally, we simulate wave propagation in optical fibers to study the effect of dispersion and experimentally demonstrate that 2 km of fiber delay does not affect the remote TPI visibility.