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Q: Fachverband Quantenoptik und Photonik

Q 69: Quantum Information: Quantum Computing and Communication IV

Q 69.4: Vortrag

Freitag, 4. März 2016, 15:15–15:30, e214

A quantum repeater scheme with single atoms in telecom-wavelength cavities — •Manuel Uphoff, Manuel Brekenfeld, Dominik Niemietz, Stephan Ritter, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching

Single atoms in optical cavities are a promising system to implement a quantum repeater, which can overcome the limitations arising from the exponential decrease of transmission with distance in optical fibers. For such a repeater to be useful, the entanglement generation between remote nodes must be mediated by photons at a telecom wavelength. Unfortunately, the ground states of easily laser cooled atoms show no suitable transitions at these wavelengths. As a solution, we propose a scheme for entanglement generation between a single atom and a telecom photon based on cascaded transitions from higher excited states of alkali atoms [1]. Owing to a modification of the atomic emission by means of crossed cavities, the telecom photons are heralded and highly indistinguishable. This is essential for a high-fidelity photonic Bell state measurement performed to provide entanglement between remote nodes. We will also discuss the prospects of extending this scheme to a simple quantum repeater that can generate entangled pairs faster than using direct transmission using state-of-the-art technology.

[1] Uphoff et al., arXiv:1507.07849 (2015)