scholarly journals Quantum Calibration of Photon-Number-Resolving Detectors Based on Multi-pixel Photon Counters

2019 ◽  
Vol 9 (13) ◽  
pp. 2638 ◽  
Author(s):  
Cai ◽  
Chen ◽  
Chen ◽  
Ma ◽  
Xu ◽  
...  
Keyword(s):  
Positive Operator ◽  
Photon Number ◽  
Avalanche Photodiode ◽  
Spatial Multiplexing ◽  
Wigner Functions ◽  
Photon Counter ◽  
Quantum Properties ◽  
Quantum Detector ◽  
Conventional Methods ◽  
Positive Operator Valued Measure

In this paper, we reconstructed the positive operator-valued measure (POVM) of a photon-number-resolving detector (PNRD) based on a multi-pixel photon counter (MPPC) by means of quantum detector tomography (QDT) at 791 nm and 523 nm, respectively. MPPC is a kind of spatial-multiplexing PNRD with a silicon avalanche photodiode (Si-APD) array as the photon receiver. Experimentally, the quantum characteristics of MPPC were calibrated at 2 MHz at two different wavelengths. The POVM elements were given by QDT. The fidelity of the reconstructed POVM elements is higher than 99.96%, which testifies that the QDT is reliable to calibrate MPPC at different wavelengths. With QDT and associated Wigner functions, the quantum properties of MPPC can be calibrated more directly and accurately in contrast with those conventional methods of modeling detectors.

Avalanche-photodiode-based photon counter echo photon number resolving

2004 ◽  
Author(s):  
Josef Blazej ◽  
Ivan Prochazka ◽  
Karel Hamal
Keyword(s):  
Photon Number ◽  
Avalanche Photodiode ◽  
Photon Counter

scholarly journals Positive operator-valued measure reconstruction of a beam-splitter tree-based photon-number-resolving detector

2015 ◽  
Vol 40 (7) ◽  
pp. 1548 ◽  
Author(s):  
F. Piacentini ◽  
M. P. Levi ◽  
A. Avella ◽  
M. López ◽  
S. Kück ◽  
...  
Keyword(s):  
Positive Operator ◽  
Beam Splitter ◽  
Photon Number ◽  
Positive Operator Valued Measure

scholarly journals Self-testing nonprojective quantum measurements in prepare-and-measure experiments

2020 ◽  
Vol 6 (16) ◽  
pp. eaaw6664 ◽  
Author(s):  
Armin Tavakoli ◽  
Massimiliano Smania ◽  
Tamás Vértesi ◽  
Nicolas Brunner ◽  
Mohamed Bourennane
Keyword(s):  
Experimental Data ◽  
Hilbert Space ◽  
Quantum System ◽  
Positive Operator ◽  
Space Dimension ◽  
Quantum Measurements ◽  
Quantum Devices ◽  
Self Testing ◽  
Robust To Noise ◽  
Positive Operator Valued Measure

Self-testing represents the strongest form of certification of a quantum system. Here, we theoretically and experimentally investigate self-testing of nonprojective quantum measurements. That is, how can one certify, from observed data only, that an uncharacterized measurement device implements a desired nonprojective positive-operator valued measure (POVM). We consider a prepare-and-measure scenario with a bound on the Hilbert space dimension and develop methods for (i) robustly self-testing extremal qubit POVMs and (ii) certifying that an uncharacterized qubit measurement is nonprojective. Our methods are robust to noise and thus applicable in practice, as we demonstrate in a photonic experiment. Specifically, we show that our experimental data imply that the implemented measurements are very close to certain ideal three- and four-outcome qubit POVMs and hence non-projective. In the latter case, the data certify a genuine four-outcome qubit POVM. Our results open interesting perspective for semi–device-independent certification of quantum devices.

Photon-number distributions for fields with Gaussian Wigner functions

1989 ◽  
Vol 40 (10) ◽  
pp. 6095-6098 ◽  
Author(s):  
S. Chaturvedi ◽  
V. Srinivasan
Keyword(s):  
Photon Number ◽  
Wigner Functions
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