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.

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 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.

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.

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 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.

scholarly journals Quantum optics and cavity QED with quantum dots in photonic crystals

2017 ◽  
Author(s):  
Jelena Vučković
Keyword(s):  
Quantum Dots ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Optics ◽  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Cavity Quantum Electrodynamics ◽  
Test Bed ◽  
Matter Interaction ◽  
Light Matter Interaction

Quantum dots in optical nanocavities are interesting as a test-bed for fundamental studies of light–matter interaction (cavity quantum electrodynamics, QED), as well as an integrated platform for information processing. As a result of the strong field localization inside sub-cubic-wavelength volumes, these dots enable very large emitter–field interaction strengths. In addition to their use in the study of new regimes of cavity QED, they can also be employed to build devices for quantum information processing, such as ultrafast quantum gates, non-classical light sources, and spin–photon interfaces. Beside quantum information systems, many classical information processing devices, such as lasers and modulators, benefit greatly from the enhanced light–matter interaction in such structures. This chapter gives an introduction to quantum dots, photonic crystal resonators, cavity QED, and quantum optics on this platform, as well as possible device applications.

A Taxonomy of Green Information and Communication Protocols and Standards

2011 ◽  
pp. 364-376 ◽  
Author(s):  
Jungwoo Ryoo ◽  
Young Choi
Keyword(s):  
Adverse Effect ◽  
Energy Consumption ◽  
Communication Technology ◽  
Systems Engineering ◽  
New Technologies ◽  
Communication Protocols ◽  
Environmental Damage ◽  
The Status ◽  
Information And Communication ◽  
Green Ict

Due to increased awareness of human’s adverse effect on the environment, many new technologies to mitigate the environmental damage are under development. Although innovative, many of these technologies are often developed in isolation and consequently incompatible with each other. From the viewpoint of Systems Engineering, this presents an enormous challenge since compatibility among different elements of a system is crucial in achieving an optimal operational state that minimizes energy consumption. Therefore, standardization in the form of protocols is a key to accomplishing the goal of green Information and Communication Technology (ICT). In this chapter, the authors examine the existing green ICT technologies and their protocols to identify both obvious and subtle strengths and weaknesses. Particularly, the authors scrutinize the interoperability of the existing green ICT protocols and provide insights on how to improve the status quo. In addition, information on emerging governing bodies of green ICT protocols is provided.

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