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Quantum detector tomography of high-dimensional multiplexed superconducting detectors

Timon Schapeler, Jan Philipp Höpker, Tim J. Bartley

We demonstrate quantum detector tomography of three different multiplexed SNSPDs, including a nonlinear detector of dimension > 103. We use this to extract efficiency, dark-count and cross-talk probability from just four elements of the reconstructed POVMs.

Conference on Lasers and Electro-OpticsJan 1, 20210 citations

Information Extraction in Photon Counting Experiments

Timon Schapeler, Tim J. Bartley

We demonstrate a comparison of different multiplexing architectures based on quantum detector tomography. Using the purity of their measurement outcomes, we gain insight into the photon-number-resolving ability of the devices. Further, we calculate the information each measurement outcome can extract from a Hilbert space with given dimension. Our work confirms that more multiplexing outcomes enable higher photon-number-resolving ability; however, the splitting between those outcomes must be optimized as well. Published by the American Physical Society 2022We demonstrate a comparison of different multiplexing architectures based on quantum detector tomography. Using the purity of their measurement outcomes, we gain insight into the photon-number-resolving ability of the devices. Further, we calculate the information each measurement outcome can extract from a Hilbert space with given dimension. Our work confirms that more multiplexing outcomes enable higher photon-number-resolving ability; however, the splitting between those outcomes must be optimized as well. Published by the American Physical Society 2022

arXiv:2202.08042Physical Review AJan 1, 20222 citations

Operational Quantum Tomography.

Olivia Di Matteo, John King Gamble, Christopher Granade +2 more

This paper describes objective technical results and analysis.

Aug 1, 20210 citations

Quantum detector tomography of a time-multiplexed superconducting nanowire single-photon detector at telecom wavelengths

Chandra M. Natarajan, Lijian Zhang, Hendrik B. Coldenstrodt-Ronge +5 more

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.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.

Optics ExpressJan 9, 201375 citations

Quantum detector tomography of a high dynamic-range superconducting nanowire single-photon detector

Timon Schapeler, Jan Philipp Höpker, Tim J. Bartley

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.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.

arXiv:2102.11596Superconductor Science and TechnologyMar 15, 20219 citations

Experimentally measuring the purity of a state without state tomography

Lynden K. Shalm, Robert B. A. Adamson, Aephraim M. Steinberg

We present an experiment that determines the purity of a state without the need for state tomography. We rely instead on a Bell-basis measurement on a pair of particles.

Quantum Electronics and Laser Science ConferenceDec 10, 20050 citations

Using outcome purity to compare multiplexed detectors

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Using outcome purity to compare multiplexed detectors

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