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QUANTUM COMMUNICATIONS AND MEASUREMENT Edited by V.P.Belavkin, O. Hirota, R. L. Hudson Plenum Press, New York 1995 Proceedings of an International Workshop on Quantum Communications and Measurement, held July 11-16, 1994, in Nottingham, England CONTENTS Part I. Quantum States and Input-Output Processes V.P. Belavkin, O. Hirota, R. Hudson. The World of Quantum Noise and 3 Fundamental Output Process S.L. Braunstein and C.M. Caves. Geometry of Quantum States 21 P. Bona. On the Problem of Universality of Quantum Theory 31 N. Cufaro Petroni. Asymptotic Behaviour of Densities for Nelson Processes 43 M.J.W. Hall. Phase and Noise 53 G.L. Sewell. On Hyperbolic Flows and the Problem of Chaos in Quantum 61 Systems V. Buzek, G. Adam, and G. Drobny. Quantum Coherences on Different 69 Observation Levels N. Liitkenhaus and S.M. Barnett. Degree of Nonclassical Behaviour 81 S.S. Hassan, R.K. Bullough, R. Saunders and H.A. Batarfi. Generalized 89 Dispersion Relations for Dielectrics in Squeezed Vacua A.K. Roy. Boson Inverse Operators and New Nonclassical States 97 Part II. Quantum Measurement Problem of Collapse M. Ozawa. Mathematical Characterizations of Measurement Statistics 109 P. Staszewski. Stochastic Dynamics of Continuously Observed Quantum 119 Systems R.L. Stratonovich. On the Dynamical Interpretation for the Collapse of State 141 during Quantum Measurement H. Schercr and P. Buscli. Weakly Disturbing Phase Space Measurements in 155 Quantum Mechanics Z. Hradil. Quantum Phase Measurement 165 T. Calarco, R. Onofrio, C. Presilla, and L. Viola. Quantum Phenomenology with 171 the Path Integral Approach S.N. Mayburov. Quantum Measurements, Phase Transitions and Spontaneous 179 Symmetry Breaking S. Pulrriannova. A Quantum Logic Description of Some Ideal Measurements 187 B. Kaulakys. On the Quantum Evolution of Chaotic Systems Affected by 193 Repeated Frequent Measurement Part III. Quantum Jumps, Diffusion