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Frontiers in Optics

The Quantum Entanglement of Measurement

Shota Yokoyama, Nicola Dalla Pozza, Takahiro Serikawa, Katanya B. Kuntz, Trevor A. Wheatley, Daoyi Dong, Elanor H. Huntington, Hidehiro Yonezawa

Published Jan 1, 2017• 0 citations
Publisher

Abstract

We demonstrate two-mode detector tomography on a detector consisting of two superconducting nanowire single photon detectors. The entangling properties of the detector is verified through a new entanglement measure of a multi-mode detection.
DOI
10.1364/fio.2017.fth3e.6

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Single Photon Detectors are integral to quantum optics and quantum information. Superconducting Nanowire based detectors exhibit new levels of performance, but have no accepted quantum optical model that is valid for multiple input photons. By performing Detector Tomography, we improve the recently proposed model [M.K. Akhlaghi and A.H. Majedi, IEEE Trans. Appl. Supercond. 19, 361 (2009)] and also investigate the manner in which these detectors respond nonlinearly to light, a valuable feature for some applications. We develop a device independent model for Single Photon Detectors that incorporates this nonlinearity.
Abstract We demonstrate and verify quantum detector tomography of a superconducting nanowire single-photon detector (SNSPD) in a multiplexing scheme which permits measurement of up to 71 000 photons per input pulse. We reconstruct the positive operator valued measure (POVM) of this device in the low photon-number regime, and use the extracted parameters to show the POVMs spanning the whole dynamic range of the device. We verify this by finding the mean photon number of a bright state. Our work shows that a reliable quantum description of large-scale SNSPD devices is possible, and should be applicable to other multiplexing configurations.