Phase-locking an interferometer with single-photon detections
- URL: http://arxiv.org/abs/2305.03641v2
- Date: Tue, 7 Nov 2023 12:45:02 GMT
- Title: Phase-locking an interferometer with single-photon detections
- Authors: Bastian Hacker, Kevin G\"unthner, Conrad R\"o{\ss}ler, Christoph
Marquardt
- Abstract summary: We report on a novel phase-locking technique for fiber-based Mach-Zehnder interferometers based on discrete single-photon detections.
Our interferometer decodes relative-phase-encoded optical pulse pairs for quantum key distribution applications.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report on a novel phase-locking technique for fiber-based Mach-Zehnder
interferometers based on discrete single-photon detections, and demonstrate
this in a setup. Our interferometer decodes relative-phase-encoded optical
pulse pairs for quantum key distribution applications and requires no locking
laser in addition to the weak received signal. Our new simple locking scheme is
shown to produce an Ornstein-Uhlenbeck dynamic and achieve optimal phase noise
for a given count rate. In case of wavelength drifts that arise during the
reception of Doppler-shifted satellite signals, the arm-length difference gets
continuously readjusted to keep the interferometer phase stable.
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