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EnglishIn forthcoming quantum networks various quantum systems might be involved to accomplish individual tasks, including storage of quantum states, quantum logic operations, error correction, or entanglement distillation. An interface between a single photon emitter and a potential photon storage could provide one fundamental building block of such a hybrid quantum system. Semiconductor quantum dots (QD) and atomic vapors have already been brought together by single photon spectroscopy of cesium and rubidium [1,2], narrow filtering of QD resonance fluorescence in cesium [3], slowing down QD photons by dispersion between the 6.8 GHz hyperfine-split rubidium D 2 transitions [4] and in the middle of the four cesium D1 transitions [5] (at around 5.0 GHz in Fig. 1 b).In our experiment the neutrally charged excitonic transition of a strain-tunable InGaAs QD is pumped either resonantly or non-resonantly by a pulsed laser. The QD emission is set between two cesium D1 transitions at 894 nm, which are hyperfine-split only by 1.2 GHz, with a very strong dispersion compared to preceding studies [4,5]. This allows for delay times of a few nanoseconds even at low optical densities, resulting in a propagation velocity at the order of 1/20 of the vacuum speed of light. Such a single photon - atom interface might lay the foundations for a low-loss quantum memory in a future hybrid quantum network.
Strong delay of quantum dot single photons in cesium vapor / Kroh, T.; Wolters, J.; Thoma, A.; Reitzenstein, S.; Wildmann, J. S.; Trotta, R.; Zallo, E.; Rastelli, A.; Schmidt, O. G.; Benson, O.. - 2017(2017). ((Intervento presentato al convegno European Quantum Electronics Conference, EQEC 2017 tenutosi a deu.
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| Titolo: | Strong delay of quantum dot single photons in cesium vapor | |
| Autori: | ||
| Data di pubblicazione: | 2017 | |
| Citazione: | Strong delay of quantum dot single photons in cesium vapor / Kroh, T.; Wolters, J.; Thoma, A.; Reitzenstein, S.; Wildmann, J. S.; Trotta, R.; Zallo, E.; Rastelli, A.; Schmidt, O. G.; Benson, O.. - 2017(2017). ((Intervento presentato al convegno European Quantum Electronics Conference, EQEC 2017 tenutosi a deu. | |
| Handle: | http://hdl.handle.net/11573/1454389 | |
| Appartiene alla tipologia: | 04b Atto di convegno in volume |
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