Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.39: Poster

Wednesday, March 13, 2024, 17:00–19:00, Tent B

Towards time-bin entangled photon cluster states — •Siavash Qodratipour, Thomas Häffner, and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, AG Nanooptik, Berlin, Germany

Single photons are ideal carriers of quantum information due to the lack of interaction with each other. However, manipulating and controlling them for quantum computing becomes a difficult task. One-way quantum computation [1] overcomes this challenge by avoiding non-linear two-qubit interaction and instead uses highly entangled states called ''cluster states''. Together with single qubit measurements and feed-forward a scalable universal quantum computer can be implemented [2]. The aim of our research is to realize a cluster state by fusion of few photon qubits which are time-bin encoded (early and late time-bins) in optical fibres. In this presentation, we will report on the generation of time-bin entangled photon pairs at 1560 nm and the subsequent characterization of the energy-time and time-bin entanglement by two photon interference [3]. We will also outline how we implement interferometric phase stability and arbitrary phase point control which are necessary to achieve a reproducible and deterministic interference. Scalability of our approach will be discussed as well.

References:

[1] Raussendorf, R. et al. Phys. Rev. Lett. 86, 5188-5191. (2001).

[2] Lu, CY. et al. Nature Phys 3, 91-95 (2007).

[3] Tanzilli, S. et al. Eur.Phys. J. D 18, 155-160 (2002).

Keywords: one-way quantum computation; Cluster states; Energy-time entanglement; Time-bin entanglement; Phase stability