Quantum Optical Processes

Sintayehu Tesfa

Sergey Edward Lyshevski, Ivan Puchades, David H. Hughes +2 more

For dynamically-reconfigurable wireless optical communication, quantum optical communication and interfacing, as well as quantum processing, we research integrated microelectronic and photonic solutions. We investigate fundamental paradigms and scalable technologies. Optical waveguides support interfacing, ultra-dense quadrature amplitude modulation, multiplexing and demultiplexing, quantum state mixing and conversion, switching, etc. The silicon nitride is nonlinear media which exhibit nonlinear electro-optical, magneto-optical, optical and quantum effects. To accomplish measurable and processable transductions on physical variables which realize processing schemes, we investigate integration and role of passive and active components, such as controlled lasers, quantum dots, photon detectors, etc. Our objective is to find engineering silicon photonics for quantum-enabled processing and communication. Information science, quantum mechanics and nonlinear optics paradigms are applied. Analytic and low-fidelity experimental studies are reported.

Masoud Ghalaii, A. T. Rezakhani

Using coherent states in optical quantum process tomography is a practically relevant approach. Here we develop a framework for complete characterization of quantum-optical processes in terms of normally-ordered moments by using coherent states as probes. We derive the associated superoperator tensors for several optical processes. We also show that our technique can be used to determine nonclassicality features of quantum-optical states and processes. Furthermore, we investigate identification of multimode Gaussian processes and show that the number of necessary probe coherent states scales linearly with the number of modes.

Sintayehu Tesfa

Pieter Kok, Brendon W. Lovett

Quantum information processing offers fundamental improvements over classical information processing, such as computing power, secure communication, and high-precision measurements. However, the best way to create practical devices is not yet known. This textbook describes the techniques that are likely to be used in implementing optical quantum information processors. After developing the fundamental concepts in quantum optics and quantum information theory, the book shows how optical systems can be used to build quantum computers according to the most recent ideas. It discusses implementations based on single photons and linear optics, optically controlled atoms and solid-state systems, atomic ensembles, and optical continuous variables. This book is ideal for graduate students beginning research in optical quantum information processing. It presents the most important techniques of the field using worked examples and over 120 exercises.

Alberto Barchielli, Matteo Gregoratti