Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Quantum Optics III
Q 16.2: Talk
Tuesday, March 24, 2015, 11:15–11:30, C/HSO
N00N states from a single non-linear device — •Regina Kruse1, Linda Sansoni1, Sebastian Brauner1, Raimund Ricken1, Craig S. Hamilton2, Igor Jex2, and Christine Silberhorn1 — 1Universität Paderborn, Integrierte Quantenoptik, Warburger Str. 100, D-33098 Paderborn — 2FNSPE, Czech Technical University in Prague, Břehová 7, 115 19, Praha 1, Czech Republic
In the quest for miniaturised devices for quantum information applications, integrated optics offers solutions for the generation and interfacing of photonic quantum states. Here, we present a dual-channel, integrated N00N state source, based on type-0 parametric down-conversion in a periodically poled waveguide coupler. With this approach, we eliminate narrow-band spectral filtering to make the photons indistinguishable, as well as phase-stabilisation, which is needed for the pump light in conventional multi-channel devices [1,2]. We discuss the generation protocol for photons in this type of structures [3] and measure a state fidelity of F=(84,1±2,6)%. Furthermore, we show the 2-photon N00N state interference, exhibiting twice the fringe frequency [4], as compared to classical light.
[1] H. Jin, et al., PRL 113, 103601 (2014)
[2] J. W. Silverstone, et al., Nature Phot. 8, 104 (2014)
[3] R. Kruse, et al., NJP 15, 083046 (2013)
[4] J. P. Dowling, Contemp. Phys. 49, 125 (2008)