The paper addresses the issue of selecting the optimal operating point for a sensor based on a Hong–Ou–Mandel (HOM) interferometer with collinear degenerate type-II phase-matching. Experimental data on coincidence counting rates from single-photon detectors are compared to a model constructed using an approximation where the spectral amplitude of the biphoton field is modeled by a double-Gaussian function. Errors in determining the delay time in the HOM interferometer are estimated based on the Cramér–Rao bound. The delay times corresponding to the minimum absolute and minimum relative errors are calculated for the interferometer model. The authors have found that these delay times occur in the regions where the discrepancy between the model and the experimentally measured coincidence counting rate is approximately 2–3 %. Therefore, when selecting the operating point of the sensor, the deviation between the modeled and experimentally observed coincidence count function should be additionally taken into account.
Author Biographies
Kuts Dmitri Anatolyevich, South Ural State University, Chelyabinsk
Head of the Laboratory of Quantum Information Processing and Quantum Computing
Ushakov Vladimir Leonidovich, South Ural State University, Chelyabinsk
Engineer at the Laboratory of Quantum Information Processing and Quantum Computing
Podoshvedov Mikhail Sergeevich, South Ural State University, Chelyabinsk
Research Assistant, Laboratory of Quantum Information Processing and Quantum Computing
Stolyarov Yuri Nikolaevich, South Ural State University, Chelyabinsk
Assistant, Laboratory of Quantum Information Processing and Quantum Computing
Podoshvedov Sergey Anatolyevich, South Ural State University, Chelyabinsk
Dr. Sc. (Physics and Mathematics), Senior Research Scientist, Laboratory of Quantum Information Processing and Quantum Computing
