Results 11 to 20 of about 31,457 (170)

Tomography of quantum detectors [PDF]

Nature Physics, 2008
In quantum mechanics, measurement has a fundamentally different role than in classical physics. Now a general method has been devised to characterize a quantum measurement device, completing the suite of so-called tomography techniques required to fully specify an experiment. Measurement connects the world of quantum phenomena to the world of classical
Lundeen, J. S., Feito, A., Coldenstrodt-Ronge, H., Pregnell, K. L., Silberhorn, C., Ralph, T. C., Eisert, J., Plenio, M. B., Walmsley, I. A.   +8 more
openaire   +5 more sources

Optimal and two-step adaptive quantum detector tomography

Automatica, 2022
Quantum detector tomography is a fundamental technique for calibrating quantum devices and performing quantum engineering tasks. In this paper, we design optimal probe states for detector estimation based on the minimum upper bound of the mean squared error (UMSE) and the maximum robustness.
Xiao, Shuixin, Wang, Yuanlong, Dong, Daoyi, Zhang, Jun   +3 more
openaire   +4 more sources

Quantum detector tomography of a superconducting nanostrip photon-number-resolving detector

Optics Express, 2021
Superconducting nanostrip photon detectors have been used as single-photon detectors, which can discriminate only photons’ presence or absence. It has recently been found that they can discriminate the number of photons by analyzing the output signal waveform, and they are expected to be used in various fields, especially in optical-quantum-information
Mamoru Endo, Tatsuki Sonoyama, Mikihisa Matsuyama, Fumiya Okamoto, Shigehito Miki, Masahiro Yabuno, Fumihiro China, Hirotaka Terai, Akira Furusawa   +8 more
openaire   +5 more sources

Mitigation of readout noise in near-term quantum devices by classical post-processing based on detector tomography [PDF]

Quantum, 2020
We propose a simple scheme to reduce readout errors in experiments on quantum systems with finite number of measurement outcomes. Our method relies on performing classical post-processing which is preceded by Quantum Detector Tomography, i.e., the ...
Filip B. Maciejewski, Zoltán Zimborás, Michał Oszmaniec   +2 more
doaj   +3 more sources

On the regularization and optimization in quantum detector tomography

Automatica, 2023
Quantum detector tomography (QDT) is a fundamental technique for calibrating quantum devices and performing quantum engineering tasks. In this paper, we utilize regularization to improve the QDT accuracy whenever the probe states are informationally complete or informationally incomplete. In the informationally complete scenario, without regularization,
Xiao, Shuixin, Wang, Yuanlong, Zhang, Jun, Dong, Daoyi, Yokoyama, Shota, Petersen, Ian R, Yonezawa, Hidehiro   +6 more
openaire   +5 more sources

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

Optics Express, 2013
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.
Natarajan, C.M., Zhang, L., Coldenstrodt-Ronge, H., Donati, G., Dorenbos, S.N., Zwiller, V., Walmsley, I.A., Hadfield, R.   +7 more
openaire   +6 more sources

Quantum detector tomography of a 2×2 multi-pixel array of superconducting nanowire single photon detectors

Optics Express, 2020
We demonstrate quantum detector tomography of a commercial 2×2 array of superconducting nanowire single photon detectors. We show that detector-specific figures of merit including efficiency, dark-count and cross-talk probabilities can be directly extracted, without recourse to the underlying detector physics.
Timon Schapeler, Jan Philipp Höpker, Tim J. Bartley   +2 more
openaire   +5 more sources

Dual-Path State Reconstruction Scheme for Propagating Quantum Microwaves and Detector Noise Tomography [PDF]

Physical Review Letters, 2010
Quantum state reconstruction involves measurement devices that are usually described by idealized models, but not known in full detail in experiments. For weak propagating microwaves, the detection process requires linear amplifiers which obscure the signal with random noise.
Menzel, E. P., Deppe, F., Mariantoni, M., Caballero, M. Á. Araque, Baust, A., Niemczyk, T., Hoffmann, E., Marx, A., Solano, E., Gross, R.   +9 more
openaire   +5 more sources

Detector tomography on IBM quantum computers and mitigation of an imperfect measurement [PDF]

Physical Review A, 2019
We use quantum detector tomography to characterize the qubit readout in terms of measurement positive operator-valued measures (POVMs) on IBM quantum computers IBM Q 5 Tenerife and IBM Q 5 Yorktown. Our results suggest that the characterized detector model deviates from the ideal projectors, ranging from 10 to 40%. This is mostly dominated by classical
Yanzhu Chen, Maziar Farahzad, Shinjae Yoo, Tzu-Chieh Wei   +3 more
openaire   +3 more sources

Deep learning based localisation and classification of gamma photon interactions in thick nanocomposite and ceramic monolithic scintillators [PDF]

Scientific Reports
Accurate localisation of the first point of interaction (FPoI) of incident gamma photons in monolithic scintillators is crucial for many radiation-based imaging applications - in particular, accurate estimation of the lines of response in positron ...
Mushen Shen, Ragy Abraham, Elise Cribbin, Harrison Gregor, Mitra Safavi-Naeini, Daniel Franklin   +5 more
doaj   +2 more sources