Quantum Communications and Measurement (eBook, PDF)

Redaktion: Belavkin, V. P.; Hudson, R. L.; Hirota, Osamu

• Format: PDF

Produktbeschreibung

The International Workshop on Quantum Communications and Measurement was held at the University of Nottingham from July 10-16, 1994. It followed the successful meeting on Quantum Aspects of Optical Communications in Paris in November 1990. This time the conference was devoted to mathematical, physical and engineering aspects of quantum noise, signal processing and quantum informa tion in open systems, quantum channels, and optical communications. It brought research workers in the experimental and engineering aspects of quantum optics and communication systems into contact with theoreticians working in quantum probability and measurement theory. The workshop was attended by more than 130 participants from 22 different countries. The largest groups [after the UK (31)] were from Japan (19) and from Russia (14). The subjects discussed included the mathematical foundations of quantum communication systems, experiments and devices, the problem of collapse and continuous measurement, quantum input and output processes, causality and nondemolition observation, squeezed states, quan tum jumps, state diffusion and spontaneous localization, filtering and control in quantum systems, and new quantum optical phenomena and effects, including non classical light. These new mathematical and physical ideas were stimulated by recent advances in generation and detection of light with low quantum noise and the development of techniques for trapping a single atom over an extended period of time, making it possible to observe individual quantum phenomena at the macroscopic level.

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Produktdetails

• Verlag: Springer US
• Seitenzahl: 532
• Erscheinungstermin: 29. Juni 2013
• Englisch
• ISBN-13: 9781489913913
• Artikelnr.: 43989789

Inhaltsangabe

I. Quantum States and Input-Output Processes.- The World of Quantum Noise and Fundamental Output Process.- Geometry of Quantum States.- On the Problem of Universality of Quantum Theory.- Asymptotic Behaviour of Densities for Nelson Processes.- Phase and Noise.- On Hyperbolic Flows and the Problem of Chaos in Quantum Systems.- Quantum Coherences on Different Observation Levels.- Degree of Nonclassical Behaviour.- Generalized Dispersion Relations for Dielectrics in Squeezed Vacua.- Boson Inverse Operators and New Nonclassical States.- II. Quantum Measurement Problem of Collapse.- Mathematical Characterizations of Measurement Statistics.- Stochastic Dynamics of Continuously Observed Quantum Systems.- On the Dynamical Interpretation for the Collapse of State during Quantum Measurement.- Weakly Disturbing Phase Space Measurements in Quantum Mechanics.- Quantum Phase Measurement.- Quantum Phenomenology with the Path Integral Approach.- Quantum Measurements, Phase Transitions and Spontaneous Symmetry Breaking.- A Quantum Logic Description of Some Ideal Measurements.- On the Quantum Evolution of Chaotic Systems Affected by Repeated Frequent Measurement.- III. Quantum Jumps, Diffusion and Localization.- A Hamiltonian Solution to Quantum Collapse, State Diffusion and Spontaneous Localization.- Event-Enhanced Formalism of Quantum Theory or Columbus Solution to the Quantum Measurement Problem.- Dissipation and Reduction of Superconducting States Due to Spontaneous Localization.- Permanent State Reduction: Motivations, Results, and By-Products.- Quantum Trajectories for Quantum Optical Systems.- Environmental and Primary Quantum State Diffusion.- Quantum Jumps in Molecules Excited by Intense Laser Field.- The Quantum State Diffusion of an Angular System.- Observation of Quantum Jumps in Squid Rings.- IV. Quantum Channels, Entropy and Information.- State Change, Complexity and Fractal in Quantum Systems.- Information in M-ary Quantum Optical Communications: An Inequality Providing an Upper Limit.- Non-Commutative Extension of the Information Geometry.- Information Gain in Quantum Communication Channels.- Mutual Entropy in Quantum Markov Chains.- Hamiltonian Model of a Transputer Quantum Automaton.- Circuitry Problems for One Quantum Multiport.- A Mathematical Study of Information Transmission in Quantum Communication Processes.- V. Quantum Detection, Estimation and Filtering.- Quantum Filtering of Markov Signals with White Quantum Noise.- Covariant POV-Measures for W*-Dynamical Systems.- On an Effectiveness of Quantum Mini-Max Formula in Quantum Communication.- Probabilities for Observing Mixed Quantum States Given Limited Prior Information.- An Example of a Received Quantum State Controller by Optical Kerr Effect.- Long Time Behavior of the Solutions of the Belavkin Quantum Filtering Equation.- Optimal Quantum Measurements for Two Pure and Mixed States.- Differential Geometrical Aspects of Quantum State Estimation and Relative Entropy.- VI. Quantum Optics, Experiments and Simulation.- Quantum Noise Eaters.- Stochastic Simulations of Dissipation in Quantum Optics: Quantum Superpositions.- Continuous-Wave Squeezed-Light Generation Using a Triply Resonant Optical Parametric Oscillator.- Quantum Noise Reduction Using a Nonlinear Sagnac Loop with Positive Dispersion.- Suppression of Thermal Scattering in Nonlinear Polar Crystals.- Injection Locked Lasers as Amplifiers.- Photocurrent Noise Suppression and Optical Amplification in Negative-Feedback Opto-Electronic Loop.- Nonclassical Fields in One-Photon Micromaser Action.