Phase estimation of time-bin qudits by time-resolved single-photon counting

• URL: http://arxiv.org/abs/2012.09939v2
• Date: Thu, 1 Apr 2021 16:13:45 GMT
• Title: Phase estimation of time-bin qudits by time-resolved single-photon counting
• Authors: Artur Czerwinski, Karolina Sedziak-Kacprowicz, Piotr Kolenderski
• Abstract summary: We present a comprehensive framework for quantum state tomography (QST) of time-bin qudits sent through a fiber. A realistic scenario is considered where the time uncertainty of the detector is treated as a source of experimental noise.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a comprehensive framework for quantum state tomography (QST) of time-bin qudits sent through a fiber. Starting from basic assumptions, we define a positive-operator valued measure (POVM) which is then applied to the quantum state reconstruction problem. A realistic scenario is considered where the time uncertainty of the detector is treated as a source of experimental noise. The performance of the quantum tomography framework is examined through a series of numerical simulations conducted for different parameters describing the apparatus. The quality of state recovery, quantified by the notion of minimum fidelity, is depicted on graphs for a range of fiber lengths. Special attention is paid to relative phase reconstruction for qubits and qutrits. The results present relevant interdependence between the fiber length and the detector jitter.

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