Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Poster: Quantum Optics and Photonics I

Q 31.49: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1+2

Entangled Photon Pair source — •Oleg Nikiforov and Thomas Walther — AG Laser und Quantenoptik, Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstr. 7, 64289 Darmstadt, Germany

Quantum Key Amplification (QKA) offers information-theoretical security for communication superior to the majority of contemporary classical key distribution and amplification schemes. An entangled photon pair source is being set up for the QKA experiment ``Quantum Key Hub`` within the Collaborative Research Center CROSSING at TU Darmstadt.

The energy-time entangled photons at telecommunication wavelengths will be used for entanglement-based QKA protocols and should obtain high coherence length. Therefore transform limited pulses are created at the 1550 nm wavelength using an fiber amplifier [1]. Then, after second harmonic generation in an PPLN crystal, the converted light pulses lead to creation of entangled photon pairs via spontaneous parametric down conversion of type II in a PPKTP crystal [2]. The current experimental status is discussed.

[1] K. Schorstein and T. Walther. ``A high spectral brightness Fourier-transform limited nanosecond Yb-doped fiber amplifier''. Applied Physics B 97 (2009), pp. 591-597.

[2] E. Keller, and M. H. Rubin. ''Theory of two-photon entanglement for spontaneous parametric down-conversion driven by a narrow pump pulse``. Physical review. A 56.2 (1997): 1534-1541.