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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures

Otto Dietz, Chris Müller, Thomas Kreißl, Ulrike Herzog, Tim Kroh, Andreas Ahlrichs, and Oliver Benson (2016)

A folded-sandwich polarization-entangled two-color photon pair source with large tuning capability for applications in hybrid quantum architectures

Applied Physics B, 122(33).

We demonstrate a two-color entangled photon pair source which can be adapted easily to a wide range of wavelengths combinations. A Fresnel rhomb as a geometrical quarter-wave plate and a versatile combination of compensation crystals are key components of the source. Entanglement of two photons at the Cs D1 line (894.3 nm) and at the telecom O-band (1313.1 nm) with a fidelity of F=0.753±0.021 is demonstrated and improvements of the setup are discussed.

non-degenerate, quantum hybrid, down-conversion, two-color, entangled photon source, quantum repeater