Abstract
Superconducting nanowire single-photon detectors (SNSPDs) are widely used in telecom wavelength optical quantum information science applications. Quantum detector tomography allows the positive-operator-valued measure (POVM) of a single-photon detector to be determined. We use an all-fiber telecom wavelength detector tomography test bed to measure detector characteristics with respect to photon flux and polarization, and hence determine the POVM. We study the SNSPD both as a binary detector and in an 8-bin, fiber based, Time-Multiplexed (TM) configuration at repetition rates up to 4 MHz. The corresponding POVMs provide an accurate picture of the photon number resolving capability of the TM-SNSPD.
Highlights
Experiments in quantum information science (QIS) typically encompass quantum state preparation, quantum operation and quantum measurement
We study the SNSPD both as a binary detector and in an 8-bin, fiber based, Time-Multiplexed (TM) configuration at repetition rates up to 4 MHz
The corresponding positive-operatorvalued measure (POVM) provide an accurate picture of the photon number resolving capability of the TM-SNSPD
Summary
Experiments in quantum information science (QIS) typically encompass quantum state preparation, quantum operation (process) and quantum measurement. SNSPDs operate at a more accessible temperature (~4 K) offering free-running single-photon sensitivity from visible to mid infrared with low dark counts (1-100 Hz), excellent timing resolution (< 60 ps) and short dead time (~10 ns) [12,13,14]. These properties have enabled SNSPDs to be widely used in QIS applications such as quantum key distribution [15], characterization of quantum circuits [16], characterization of single photon sources [17] and development of quantum repeaters via spin-photon entanglement [18]. Two highly efficient fiber-coupled SNSPDs (system detection efficiency (SDE) > 20% at 1310 nm; SDE > 10% at 1550 nm) were used to construct an 8-bin TM-SNSPD and operated at 1 - 4 MHz clock rate at telecom wavelengths
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