by
Philippe Goldner(École Nationale Supérieure de Chimie de Paris - Chimie ParisTech)
→
Europe/Zurich
26 1 022
26 1 022
Description
Quantum information uses the superposition states of light or matter to perform new data processing or transmission tasks, which are impossible to obtain with classical states. Applications include quantum computing, which could dramatically speed up some calculations and optical quantum memories, devices able to store and release faithfully photonic quantum states. The latter could be used to extend the range of quantum cryptography, which allows one to transmit information with an unprecedented security and is commercially available. Although striking results have been obtained in atomic vapors and cold atomic clouds, solid state systems present the advantage of stability and simple cooling since low temperatures are needed in most cases. They also offer the opportunity to develop specific and highly efficient processing protocols. Rare earth doped crystals have been recently considered for these applications because of their long optical and hyperfine coherence lifetimes. As an example, light to matter quantum state teleportation has been recently reported in these materials [1].
In this talk, we will discuss results obtained in our group on memories for optical and microwave photons that use hyperfine levels for extending storage times [2-4].
References:
[1] F. Bussières, et al. Nat. Photonics 8, 775–778 (2014).
[2] M. Lovrić, D. Suter, A. Ferrier, and P. Goldner, Phys. Rev. Lett., 111 (2013) 020503.
[3] R. M. Macfarlane, A. Arcangeli, A. Ferrier, and P. Goldner, Phys. Rev. Lett. 113, 157603 (2014).
[4] G. Wolfowicz, H. Maier-Flaig, R. Marino, A. Ferrier, H. Vezin, J. J. L. Morton, and P. Goldner, Phys. Rev. Lett. 114, 170503 (2015).
