Papers › Sub-0.1 degree phase locking of a single-photon interferometer
Sub-0.1 degree phase locking of a single-photon interferometer
Vojtěch Švarc, Martina Nováková, Michal Dudka, Miroslav Ježek
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We report a single-photon Mach-Zehnder interferometer stabilized to a phase precision of 0.05 degrees over 15 hours. To lock the phase, we employ an auxiliary reference light at a different wavelength than the quantum signal. The developed phase locking operates continuously, with negligible crosstalk, and for an arbitrary phase of the quantum signal. Moreover, its performance is independent of intensity fluctuations of the reference. Since the presented method can be used in a vast majority of quantum interferometric networks it can significantly improve phase-sensitive applications in quantum communication and quantum metrology.
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