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Q: Fachverband Quantenoptik und Photonik

Q 4: Quantum information: Quantum communication I

Q 4.6: Vortrag

Montag, 18. März 2013, 12:15–12:30, F 342

Towards indistinguishability of photons from dissimilar sources — •Christoph Berkemeier, Andreas Ahlrichs, Andreas W. Schell, Otto Dietz, Tim Kroh, Benjamin Sprenger, and Oliver Benson — AG Nano Optics, Institut für Physik, HU Berlin

Long-distance quantum key distribution will require quantum repeater nodes, which are necessary for entanglement swapping between entangled photon pairs. A first step towards this goal is tailoring photons from dissimilar sources, in this case quantum dots and a photon pair source, to be indistinguishable in all degrees of freedom [1]. To increase the distance between nodes, single photon conversion into the telecommunications bands as shown in [2] could interconnect the different units with a low damped wavelength for long distance transmission in fiber.

The sources we use are single photons from quantum dots, and those from a parametric downconversion source in a cavity. We present a cascaded Fabry-Pérot filtering system, based on [3], which is simultaneously applied on photons from both sources. The quantum dot photons are filtered to 100 MHz width, and the system is optimized for long-term stability.

[1] Solomon et al., J. Opt. Soc. Am. B, 29, 319 (2012)

[2] Zaske et al., Opt. Express, 19, 12825 (2011)

[3] Palittapongarnpim et al., Rev. Sci. Instrum. 83, 066101 (2012)