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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics II

Q 31.64: Poster

Tuesday, March 24, 2015, 17:00–19:00, C/Foyer

Entanglement in the x-ray regime using nuclear transitions — •Fabian Lauble1, Wen-Te Liao1,2,3, and Adriana Pálffy11Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — 3Center for Free Electron Laser Science, Hamburg, Germany

Compared to optical photons, x-rays are less plagued by the diffraction limit and can be much better focused. The future potential of x-ray qubits however relies crucially on the possibility to control the quantum behavior of single x-ray photons, for which atomic nuclei rise as natural candidates. Here we show theoretically that using the technique of nuclear forward scattering, single x-ray photons can be controlled and we present several alternatives of x-ray entanglement generation. In particular, a setup for generating the special superposition of a simultaneously forward- and backward-propagating collective excitation in a nuclear sample [1] is addressed. Our setup relies on actively manipulating the scattering channels of single x-ray quanta with the help of a normal incidence x-ray mirror to create a nuclear polariton which propagates in two opposite directions. The two counter-propagating polariton branches are entangled by a single x-ray photon, while their phase relation can be controlled by the hyperfine magnetic field in the sample for instance by coherent storage [2].

[1] W.-T. Liao and A. Pálffy, Phys. Rev. Lett. 112, 057401 (2014).
[2] W.-T. Liao, A. Pálffy and C. H. Keitel, Phys. Rev. Lett 109, 197403 (2012).

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