HIGH-ORDER PHOTON-NUMBER CORRELATIONS: A RESOURCE FOR CHARACTERIZATION AND APPLICATIONS OF QUANTUM STATES

2012 ◽  
Vol 10 (08) ◽  
pp. 1241003 ◽  
Author(s):  
ALESSIA ALLEVI ◽  
STEFANO OLIVARES ◽  
MARIA BONDANI
Keyword(s):  
Correlation Functions ◽  
Photon Number ◽  
High Order ◽  
Quantum States ◽  
Quantum Behavior ◽  
Twin Beam ◽  
High Order Correlation ◽  
Analytical Expressions ◽  
Good Agreement ◽  
Classical States

We measure high-order correlation functions of detected-photon numbers in the mesoscopic regime by means of hybrid photodetectors. The analytical expressions for correlations are evaluated in terms of quantities that can be experimentally accessed by a selfconsistent analysis of the detectors' outputs. We demonstrate that high-order correlations can be used to characterize the nature of the optical states, for instance by better discriminating between classical and quantum behavior even in critical situations, such as multimode twin-beam state. The results are in very good agreement with the theory, both for classical states and quantum states.

scholarly journals Measuring Nonclassicality of Mesoscopic Twin-Beam States with Silicon Photomultipliers †

Proceedings ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 48
Author(s):  
Giovanni Chesi ◽  
Luca Malinverno ◽  
Alessia Allevi ◽  
Romualdo Santoro ◽  
Massimo Caccia ◽  
...  
Keyword(s):  
Quantum Information ◽  
Quantum Optics ◽  
Output Signal ◽  
Photon Number ◽  
Quantum States ◽  
Silicon Photomultipliers ◽  
Nonclassical Properties ◽  
Relevant Topic ◽  
Twin Beam ◽  
Proper Analysis

The study of nonclassical properties of quantum states is a relevant topic for fundamental Quantum Optics and Quantum Information applications. In the mesoscopic domain, promising results have been obtained using photon-number-resolving detectors. Here we show recent results achieved with the class of Silicon Photomultipliers: by a proper analysis of the output signal, the nonclassicality of twin-beam states can be detected and exploited.

scholarly journals Tailoring Asymmetric Lossy Channels to Test the Robustness of Mesoscopic Quantum States of Light

2020 ◽  
Vol 10 (24) ◽  
pp. 9094
Author(s):  
Alessia Allevi ◽  
Maria Bondani
Keyword(s):  
Gaussian Distribution ◽  
Data Transfer ◽  
Photon Number ◽  
Quantum States ◽  
Statistical Distributions ◽  
Noise Sources ◽  
The Past ◽  
Twin Beam ◽  
Log Normal ◽  
Intensity Regime

In the past twenty years many experiments have demonstrated that quantum states of light can be used for secure data transfer, despite the presence of many noise sources. In this paper we investigate, both theoretically and experimentally, the role played by a statistically-distributed asymmetric amount of loss in the degradation of nonclassical photon-number correlations between the two parties of multimode twin-beam states in the mesoscopic intensity regime. To be as close as possible to realistic scenarios, we consider two different statistical distributions of such a loss, a Gaussian distribution and a log-normal one. The results achieved in the two cases show to what extent the involved parameters, both those connected to loss and those describing the employed states of light, preserve nonclassicality.

Characterization of Microstructure of Fibrous Composites Using High-Order Correlation Functions

2015 ◽  
Vol 243 ◽  
pp. 121-129
Author(s):  
Mikhail Tashkinov
Keyword(s):  
Correlation Functions ◽  
Microstructural Characterization ◽  
High Order ◽  
Fibrous Composites ◽  
Representative Volume ◽  
Representative Volume Elements ◽  
High Order Correlation

This paper introduces the methodology of microstructural characterization of fibrous composites using correlation functions of different orders. Its implementation is demonstrated on several examples of modeled representative volume elements. The ways of obtaining values of the functions as well as the procedure of their approximation are presented. The possible applications of such methodology are discussed.

High-order expanded XAFS Debye–Waller factors of HCP crystals based on classical anharmonic correlated Einstein model

2014 ◽  
Vol 28 (21) ◽  
pp. 1450174 ◽  
Author(s):  
Nguyen Van Hung ◽  
Tong Sy Tien ◽  
Ngyen Ba Duc ◽  
Dinh Quoc Vuong
Keyword(s):  
Effective Potential ◽  
Interatomic Interaction ◽  
High Order ◽  
Cumulant Expansion ◽  
X Ray ◽  
Einstein Model ◽  
Atomic Vibrations ◽  
X Ray Absorption ◽  
Analytical Expressions ◽  
Good Agreement

In this paper, high-order expanded anharmonic effective potential and Debye–Waller factors in X-ray absorption fine structure (XAFS) of hcp crystals have been studied based on classical anharmonic correlated Einstein model. Here XAFS Debye–Waller factors are presented in terms of cumulant expansion up to the fourth order and their analytical expressions have been derived based on classical statistical theory. They contain the parameters of a derived high-order anharmonic effective potential that takes into account all nearest neighbors of absorber and backscattering atoms, where Morse potential is assumed to describe interatomic interaction included in this derived anharmonic effective potential. The dependence of the derived cumulants on atomic vibrations is described by their proportionality to the correlated Einstein frequency. This model avoids full lattice dynamical calculations yet provides good agreement of numerical results for Zn and Cd with experiment at several temperatures.

Sign in / Sign up

Export Citation Format

Share Document