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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.75: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Photonic Phase Gate via an Exchange of Fermionic Spin Waves in a Spin Chain — •Johannes Otterbach¹, Alexey V. Gorskov², Eugene Demler³, Michael Flesichhauer¹, and Mikhail D. Lukin³ — ¹Fachbereich Physik & Forschungszentrum OPTIMAS, TU Kaiserslautern — ²Physics Department, California Institute of Technology, Pasadena, CA, USA — ³Physics Department, Harvard University, Cambridge, MA, USA

We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach [1], the phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. This scheme provides a robust phase shift in thus the relative acquired phase is exactly π, independent of any fine tuning of parameters. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Experimental systems suitable for implementing the gate and possible imperfections are discussed.

[1] A. V. Gorshkov et al., Phys. Rev. Lett. 105, 060502 (2010).