Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 37: Poster III

Q 37.30: Poster

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

Entanglement generation in photonic two photon quantum walks — •Federico Pegoraro, Philip Held, Benjamin Brecht, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS) Warburger Str. 100, 33098, Paderborn, Germany

Entanglement constitutes a fundamental property for the development of quantum algorithms and protocols capable of outperforming their classical counterparts in terms of speed and resource efficiency. In order to be able to exploit the advantages offered by entanglement one must be capable of producing such a resource. For this reason we study how to generate entanglement in a photonic setting using a well known quantum process: the multi-walker quantum walk (QW). In this process a number of quantum objects, the "walkers", evolve in a position space according to the update of an internal degree of freedom called coin. We use a photon pair produced via type-II spontaneous parametric down-conversion as walkers: their coins are encoded into the respective polarization states, while for the position space we employ a time-multiplexing loop where a given arrival time corresponds to a certain output position. The two photons are launched in the QW and propagate in the setup for a certain amount of round-trips after which they are released and detected. By performing joint polarization-tomography on the walkers at the output of the QW, we can evaluate the dynamics of entanglement creation and distribution in the QW.

Keywords: Quantum Walks; Entaglement; Quantum Simulation; Quantum Technologies; Photonic Systems