Results 21 to 30 of about 31,457 (170)

When quantum state tomography benefits from willful ignorance

New Journal of Physics, 2021
We show that quantum state tomography with perfect knowledge of the measurement apparatus proves to be, in some instances, inferior to strategies discarding all information about the measurement at hand, as in the case of data pattern tomography.
Libor Motka, Martin Paúr, Jaroslav Řeháček, Zdeněk Hradil, Luis L Sánchez-Soto   +4 more
doaj   +1 more source

Modeling and mitigation of cross-talk effects in readout noise with applications to the Quantum Approximate Optimization Algorithm [PDF]

Quantum, 2021
Measurement noise is one of the main sources of errors in currently available quantum devices based on superconducting qubits. At the same time, the complexity of its characterization and mitigation often exhibits exponential scaling with the system size.
Filip B. Maciejewski, Flavio Baccari, Zoltán Zimborás, Michał Oszmaniec   +3 more
doaj   +1 more source

Tomography of binary quantum detectors [PDF]

2019 IEEE 58th Conference on Decision and Control (CDC), 2019
A tomography method for binary detectors is developed. In this method, different input states are employed and the measurement data are then collected. First a primary estimation of the detector is obtained through least squares estimation, without considering the restriction on the eigenvalues of the detector. Then this possibly nonphysical estimation
Yuanlong Wang, Daoyi Dong, Hidehiro Yonezawa   +2 more
openaire   +1 more source

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

Superconductor Science and Technology, 2021
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 ...
Timon Schapeler, Jan Philipp Höpker, Tim J Bartley   +2 more
openaire   +2 more sources

Time-dependent POVM reconstruction for single-photon avalanche photo diodes using adaptive regularization

New Journal of Physics, 2022
We report on the first realization of time-dependent quantum detector tomography for commercially available InGaAs avalanche photo detectors. For the construction of appropriate time-dependent POVMs from experimentally measured data, we introduce a novel
E Fitzke, R Krebs, Th Haase, M Mengler, G Alber, Th Walther   +5 more
doaj   +1 more source

Continuous-variable optical quantum state tomography [PDF]

, 2008
This review covers latest developments in continuous-variable quantum-state tomography of optical fields and photons, placing a special accent on its practical aspects and applications in quantum information technology.
A. I. Lvovsky, Altepeter J. B., Bachor, H.-A., Banaszek, K., Bennett, C. H., Bialynicki-Birula, I., Blansett, E. L., Bohr, N., Bužek, V., Bužek, V., Bužek, V., Clausen, J., Cramér, H., Dempster, A. P., D’Ariano, G. M., D’Ariano, G. M., Fuchs C. A., Fuchs, C. A., Gerchberg, R. W., Gerry, C., Herman, G. T., Hradil, Z., Leonhardt, U., M. G. Raymer, Nicholson, P. W., Opatrný, T., Paul, H., Rao, C. R., Raymer, M. G., Raymer, M. G., Scully, M. O., U’Ren, A. B., U’Ren, A. B., Vardi, Y., Welsch, D.-G.   +34 more
core   +1 more source

Direct Measurement of Non-Classical Photon Statistics with a Multi-Pixel Photon Counterb

Journal of Electronic Science and Technology, 2019
Photon number resolving detectors with high accuracy bring broad applications in long-distance laser ranging, ultrafast spectroscopy, and quantum optics.
Cheng-Jie Ding, You-Ying Rong, Yu Chen, Xiu-Liang Chen, E Wu   +4 more
doaj   +1 more source

Biomedical x-ray imaging with a GaAs photon-counting detector: A comparative study

APL Photonics, 2020
Photon-counting detectors provide several potential advantages in biomedical x-ray imaging including fast and readout noise free data acquisition, sharp pixel response, and high dynamic range.
J. Scholz, L. Birnbacher, C. Petrich, M. Riedel, L. Heck, S. Gkoumas, T. Sellerer, K. Achterhold, J. Herzen   +8 more
doaj   +1 more source

Parity Detection of Propagating Microwave Fields

Physical Review X, 2020
The parity of the number of elementary excitations present in a quantum system provides important insights into its physical properties. Parity measurements are used, for example, to tomographically reconstruct quantum states or to determine if the decay
Jean-Claude Besse, Simone Gasparinetti, Michele C. Collodo, Theo Walter, Ants Remm, Jonas Krause, Christopher Eichler, Andreas Wallraff   +7 more
doaj   +1 more source

Quantum detector tomography applied to the human visual system: a feasibility study

Journal of the Optical Society of America A, 2023
We show that quantum detector tomography can be applied to the human visual system to explore human perception of photon number states. In detector tomography, instead of using very hard-to-produce photon number states, the response of a detector to light pulses with known photon statistics of varying intensity is recorded, and a model is fitted to the
Reep, T.H.A. van der, Molenaar, D., Löffler, W., Pinto, Y.   +3 more
openaire   +6 more sources