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Q: Fachverband Quantenoptik und Photonik

Q 67: Poster – Quantum Information

Q 67.20: Poster

Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG

Phase Measurements in a Highly Imbalanced Interferometer — •Maximilian Mengler, Sarah Wenk, and Thomas Walther — TU Darmstadt, Darmstadt, Germany

In entanglement-based quantum key distribution using phase-time coding, entangled photon pairs can be generated by passing a double pulse through a nonlinear crystal. To achieve consistently low error rates, the phase between these pulses must be stabilized, and their timing must be precise. This can be achieved utilizing a highly imbalanced interferometer that splits one incoming pulse into two outgoing ones. In a first step, such an interferometer is commonly stabilized in its temperature, as shifts therein change the interferometer's phase. To further reduce instabilities, an active stabilization utilizing phase measurements can be used. As a first step, we introduce a scheme that allows the measurement of the interferometer's phase without altering the pulses that run through it, but by referencing them to an external signal.

Keywords: Entanglement; Interferometer; Stabilization