Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 5: Quantum Technologies I

Q 5.5: Talk

Monday, March 14, 2022, 15:00–15:15, Q-H13

Engineering of Quantum Light with Space-Time Correlations — •Fabian Schlue, Marcello Massaro, Jano Gil López, Benjamin Brecht, Harald Herrmann, and Christine Silberhorn — Paderborn University, Integrated Quantum Optics, Institute for Photonic Quantum Systems (PhoQS), Warburger Straße 100, 33098 Paderborn, Germany

Deterministic single photon sources are necessary for numerous quantum applications, e.g., quantum communication, quantum metrology, and quantum computing. To approximate a deterministic single photon source with probabilistic sources, source-multiplexing can be used. Examples are spatial multiplexing and frequency multiplexing, which both have challenges: the former requires a large resource overhead, the latter relies on fast and efficient frequency shifting of single photons, which is still an outstanding goal.

Here, we demonstrate a time-frequency multiplexing scheme. Different sources are encoded in the frequency of one photon and, simultaneously, the timing of the partner photon. Frequency-resolved detection reads out the source and low-loss electro-optic time shifting realises the routing. This requires a specially designed source. We utilize our in-house design and production capabilities to fabricate a dispersion-engineered photon-pair source. We combine this with techniques from ultrafast pulse shaping and demonstrate the operation of a tuneable, user-chosen number of multiplexed sources. This demonstration brings us one step closer to a deterministic single photon source based on multiplexing.