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 Exploiting Silicon photomultipliers for measuring nonclassical optical states

2020 ◽  
Vol 230 ◽  
pp. 00002
Author(s):  
Giovanni Chesi ◽  
Alessia Allevi ◽  
Maria Bondani
Keyword(s):  
Quantum Information ◽  
Quantum Optics ◽  
Communication Protocols ◽  
Photon Number ◽  
Optimization Procedure ◽  
Silicon Photomultipliers ◽  
Information And Communication ◽  
Twin Beam

The search for optimal receivers endowed with photon-number-resolving capability has led us to consider Silicon photomultipliers for Quantum Optics experiments. By adopting an optimization procedure in order to reduce the spurious effects characterizing these detectors, we succeeded in detecting nonclassical correlations between the two parties of mesoscopic twin-beam states and in obtaining subPoissonian conditional states. These results put SiPMs forward for the implementation of Quantum Information and Communication protocols.

Quantum optics with nitrogen-vacancy centres in diamond

2017 ◽  
Author(s):  
Yiwen Chu ◽  
Mikhail D. Lukin
Keyword(s):  
Optical Properties ◽  
Quantum Information ◽  
Solid State ◽  
Quantum Optics ◽  
Quantum States ◽  
Nitrogen Vacancy ◽  
Common Theme ◽  
External Effects ◽  
Promising Candidate ◽  
Optical Photons

A common theme in the implementation of quantum technologies involves addressing the seemingly contradictory needs for controllability and isolation from external effects. Undesirable effects of the environment must be minimized, while at the same time techniques and tools must be developed that enable interaction with the system in a controllable and well-defined manner. This chapter addresses several aspects of this theme with regard to a particularly promising candidate for developing applications in both metrology and quantum information, namely the nitrogen-vacancy (NV) centre in diamond. The chapter describes how the quantum states of NV centres can be manipulated, probed, and efficiently coupled with optical photons. It also discusses ways of tackling the challenges of controlling the optical properties of these emitters inside a complex solid state environment.

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.

scholarly journals Preserving Nonclassicality in Noisy Communication Channels

Proceedings ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 3 ◽  
Author(s):  
Alessia Allevi ◽  
Maria Bondani
Keyword(s):  
Quantum Information ◽  
Photon Number ◽  
Communication Channels ◽  
Global Scale ◽  
Noisy Channels ◽  
Space Communication ◽  
Main Obstacle ◽  
Cryptographic Keys ◽  
Light Signals ◽  
Twin Beam

Nowadays, the transmission of quantum information, especially for the distribution of cryptographic keys, is required on a global scale. The main obstacle to overcome in free-space communication is the presence of turbulence, which causes both spatial and temporal deformations of the light signals that code information. Here we investigate the extent at which the transmission of mesoscopic twin-beam states through asymmetric noisy channels degrades the nonclassical nature of the photon-number correlations between signal and idler. We consider three nonclassicality criteria, all written in terms of measurable quantities, and demonstrate, both theoretically and experimentally, that the asymmetry introduced by losses affects the three criteria in different ways.

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 Dual form of the phase-space classical simulation problem in quantum optics

2021 ◽  
Author(s):  
Andrii A. Semenov ◽  
Andrei B Klimov
Keyword(s):  
Phase Space ◽  
Quantum Optics ◽  
Photon Number ◽  
Bell Inequalities ◽  
Physical Reality ◽  
Quantum States ◽  
Optical Measurements ◽  
Dual Form ◽  
Einstein Podolsky Rosen ◽  
Simulation Problem

Abstract In quantum optics, nonclassicality of quantum states is commonly associated with negativities of phase-space quasiprobability distributions.We argue that the impossibility of any classical simulations with phase-space functions is a necessary and sufficient condition of nonclassicality. The problem of such phase-space classical simulations for particular measurement schemes is analysed in the framework of Einstein-Podolsky-Rosen-Bell's principles of physical reality. The dual form of this problem results in an analogue of Bell inequalities. Their violations imply the impossibility of phase-space classical simulations and, as a consequence, nonclassicality of quantum states. We apply this technique to emblematic optical measurements such as photocounting, including the cases of realistic photon-number resolution and homodyne detection in unbalanced, balanced, and eight-port configurations.

scholarly journals Exploiting the wide dynamic range of silicon photomultipliers for quantum optics applications

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Silvia Cassina ◽  
Alessia Allevi ◽  
Valerio Mascagna ◽  
Michela Prest ◽  
Erik Vallazza ◽  
...  
Keyword(s):  
Quantum Optics ◽  
Dynamic Range ◽  
Photon Number ◽  
Wide Dynamic Range ◽  
Silicon Photomultipliers ◽  
Acquisition Strategies ◽  
Quantum Optical

AbstractSilicon photomultipliers are photon-number-resolving detectors endowed with hundreds of cells enabling them to reveal high-populated quantum optical states. In this paper, we address such a goal by showing the possible acquisition strategies that can be adopted and discussing their advantages and limitations. In particular, we determine the best acquisition solution in order to properly reveal the nature, either classical or nonclassical, of mesoscopic quantum optical states.

scholarly journals Procedure via cross-Kerr nonlinearities for encoding single logical qubit information onto four-photon decoherence-free states

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jino Heo ◽  
Seong-Gon Choi
Keyword(s):  
Quantum Information ◽  
Quantum Information Processing ◽  
Photon Number ◽  
Optical Devices ◽  
Quantum Bus ◽  
Reliable Procedure ◽  
Optical Gates ◽  
Photon Loss ◽  
Decoherence Effect ◽  
Logical Qubit

AbstractWe propose a photonic procedure using cross-Kerr nonlinearities (XKNLs) to encode single logical qubit information onto four-photon decoherence-free states. In quantum information processing, a decoherence-free subspace can secure quantum information against collective decoherence. Therefore, we design a procedure employing nonlinear optical gates, which are composed of XKNLs, quantum bus beams, and photon-number-resolving measurements with linear optical devices, to conserve quantum information by encoding quantum information onto four-photon decoherence-free states (single logical qubit information). Based on our analysis in quantifying the affection (photon loss and dephasing) of the decoherence effect, we demonstrate the experimental condition to acquire the reliable procedure of single logical qubit information having the robustness against the decoherence effect.

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