Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 54: Quantum Networks: Quantum Memory and Gates

FM 54.3: Talk

Wednesday, September 25, 2019, 14:45–15:00, 1015

Quantum Memories for Single Photons — •Tom Schmit, Luigi Giannelli, and Giovanna Morigi — Theoretische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany

Quantum memories are storage units of a quantum network [1]. In this work we theoretically characterize quantum memories for flying qubits based on single photons [2]. The quantum memories we analyse are i) a single atom inside an optical resonator and ii) a solid-state medium such as a rare-earth-ion doped crystal. We determine the efficiency of storage protocols based on adiabatic dynamics in the different setups and identify the parameter regimes where adiabatic protocols are preferable. We further discuss analogies and differences between the storage dynamics of a single photon [3] and of a weak coherent pulse [4]. Finally, we analyse the dynamics of propagation of a single photon which dispersively interact with an inhomogeneously broadened medium and explore perspectives to use inhomogeneous broadening for tailoring the single photon’s spectral shape.
 
[1] H. J. Kimble, Nature 453, 1023 (2008).
[2] N. Sangouard and H. Zbinden, Jour. of Mod. Opt., 59:17, 1458-1464 (2012).
[3] L. Giannelli, T. Schmit, T. Calarco, C. P. Koch, S. Ritter, and G. Morigi, New J. Phys. 20, 105009 (2018)
[4] L. Giannelli, T. Schmit, and G. Morigi, Phys. Scr. 94, 014012 (2018).