Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects (Entanglement and Decoherence)

Q 66.5: Talk

Friday, March 9, 2018, 11:30–11:45, K 1.013

Quantum description of lossy integrated photonic waveguide structures — •Lucas Teuber and Stefan Scheel — Institut für Physik, Universität Rostock, D-18055 Rostock, Germany

Integrated photonic waveguide structures created by the femtosecond laser direct-writting technique are a promising candidate for the implementation of quantum computational circuits [1]. The photons, as carriers of quantum information, are guided along the laser-written waveguides and can be exchanged between different waveguides via evanescent coupling. However, decoherence effects such as photon loss, dephasing, or path walk-off, have a detrimental effect on the ability to encode, transmit, and manipulate quantum information.

Here we report on our efforts to solve these problems. We derive a quantum mechanical description by discretizing the structures along the propagation direction and employing commutator-preserving input/output relations [2] for propagation and coupling. Additionally, we analyse different lossy waveguide structures to formulate suitable quantum eigenstates for optimal transport of quantum information.

[1] Meany, T. et al., Laser Photonics Rev. 9, 363 (2015).

[2] Scheel, S. and Buhmann, S.Y., Acta Phys. Slov. 58, 675 (2008).