Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 54: Quantum Networks: Quantum Memory and Gates
FM 54.2: Talk
Mittwoch, 25. September 2019, 14:30–14:45, 1015
Towards a single photon memory based on electromagnetically induced transparency — •Esteban Gomez Lopez1, Tim Kroh1, Chis Müller1, Janik Wolters2, and Oliver Benson1 — 1Humboldt-Universität zu Berlin, Germany — 2Universität Basel, Switzerland
Quantum networks promise to bring secure communications to our increasingly technology-dependent society. In order to create a truly scalable quantum network, quantum repeaters are needed to overcome the irremediable losses in quantum channels [1]. Such devices have at their core a quantum memory capable of mapping the state of a photon into a long lived matter state, such as a spin coherence, in a reversible manner [2]. Here we present a variable delay stage for photons using electromagnetically induced transparency (EIT) as a first step towards an EIT quantum memory. A maximum EIT window width of 150 MHz was obtained in Cs. This bandwidth is compatible with photon pairs emitted by a cavity enhanced SPDC source [3]. Faint light pulses were delayed up to 62.4(0.7) ns. This storage device can be used as the base for a quantum memory if also the coupling beam is pulsed. Storage times of up to seconds are feasible [4].
[1] N. Gisin and R. Thew, Nat. Photonics 1, 165 (2007).
[2] A. I. Lvovsky, B. C. Sanders, and W. Tittel, Nat. Photonics 3, 706 (2009).
[3] A. Ahlrichs and O. Benson, Appl. Phys. Lett. 108, 021111 (2016).
[4] O. Katz and O. Firstenberg, Nat. Commun. 9, 2074 (2018).