SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.83: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Ultra-low-loss non-reciprocal devices based on acousto-optic interaction in fiber null-couplers — •Riccardo Pennetta, Martin Blaha, Jürgen Volz, and Arno Rauschenbeutel — Department of Physics, Humboldt Universität zu Berlin, 12489 Berlin, Germany

The introduction of low-loss optical fibers probably represents the single most important advance in the growth of our telecommunication system. To meet our needs for secure communications, it is likely that our classical network will soon be operating alongside what is known as a quantum network. The latter is very sensitive to loss and thus poses new constraints to the performance of current fiber components. In particular, recent quantum network prototypes underlined the surprising absence of low-loss non-reciprocal fiber-based devices. Here, we present a solution to this issue by the proof-of-principle demonstration of ultra-low-loss (<0.1 dB) non-reciprocal devices (both isolators and circulators) based on so-called fiber null-couplers. The splitting ratio of these couplers can be controlled via acousto-optic interaction of the propagating light field with flexural acoustic waves that one launches along the coupling region. Fabricated from standard single-mode fibers, these devices are compatible with existing optical networks and could represent one important ingredient for the transmission and processing of optically encoded quantum information.