Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster I

Q 35.35: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Time-resolved Bell-state measurement between photons from remote single atoms — •Andreas Neuzner, Christian Nölleke, Andreas Reiserer, Carolin Hahn, Gerhard Rempe, and Stephan Ritter — Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany

Detecting the Bell-state of two particles via a combined measurement is the key technique for the implementation of quantum teleportation protocols that allow for the heralded transfer of quantum information over large distances. We investigate Bell-state measurement of the polarization state of two photons originating from cavity-based neutral-atom quantum memories in separate laboratories. Two-photon interference and polarization-sensitive detection allow us to unambigously detect two of the four Bell states. The photons are generated via a vacuum-stimulated Raman adiabatic passage (vSTIRAP). By adjusting parameters of this process, we can tailor properties of the photons like temporal envelope and center frequency. We choose a width of the photons’ envelope that exceeds the temporal resolution of the detection setup by more than two orders of magnitude. We can thus distinguish the arrival-time difference of the two temporal envelopes from the detection time difference of two individual photon events. A technique to herald events with increased interference contrast is demonstrated. Combining the Bell-state measurement with the creation of atom-photon entanglement enables us to implement teleportation of atomic states over a distance of 21m.