Scientific Interests

This is a list of subjects which indicate some of the scientific problems I have found interesting and/or spent some research effort on during the last few decades. For the moment only literature references are given.

Quantum measurements and information

  • An entropy inequality for quantum measurements.
    Commun. Math. Phys. 28, 245-249 (1972)
  • Entropy, information and quantum measurements.
    Commun. Math. Phys. 33, 305-322 (1973)
  • Expectations and entropy inequalities for finite quantum systems.
    Commun. Math. Phys. 39, 111-119 (1974)
  • Completely positive maps and entropy inequalities.
    Commun. Math. Phys. 40, 147-151 (1975)
  • Quantum entropy and quantum measurements.
    In: Quantum aspects of optical communications.
    C. Bendjaballah, O. Hirota, S. Reynaud (eds)
    Lecture Notes in Physics 378, Springer 1991, pp 71-80
  • A general no-cloning theorem
    Lett. Math. Phys. 47, 1899-196 (1999)

    Open quantum systems

  • On the generators of quantum dynamical semigroups.
    Commun. Math. Phys. 48, 119-130 (1976)
  • Brownian motion of a quantum harmonic oscillator.
    Rep. Math. Phys. 10, 393-406 (1976)
  • Dissipative operators and cohomology of operator algebras.
    Lett. Math. Phys. 1, 219-224 (1976)
  • Non-Markovian quantum stochastic processes and their entropy.
    Commun. Math. Phys. 65, 281-294 (1979)
  • Gaussian quantum stochastic processes on the CCR algebra.
    J. Math. Phys. 20, 2081-87 (1979)
  • On the existence of quantum subdynamics.
    J. Phys. A 29, 4197-4207 (1996)
  • Brownian motion of quantum harmonic oscilllators: existence of a subdynamics
    J. Math. Phys. 39, 2763-2780 (1998)

    Quantum ergodicity and chaos

  • Quantum ergodicity and chaos.
    In: Fundamental aspects of quantum theory , NATO ASI B144
    V. Gorini, A. Frigerio (eds). New York: Plenum Press 1986, pp 199-208
  • Dynamical entropy for quantum systems.
    in Quantum Probability and Applications III,
    L. Accardi, W. von Waldenfels (eds) (Lecture Notes in Mathematics 1303).
    Berlin: Springer 1988, pp. 183-191
  • Fokker-Planck equations for eigenstate distributions
    Lett. Math. Phys. 25, 161-174 (1992)
  • Determinism and randomness in quantum dynamics.
    J. Phys. A 26, 7193-7211 (1993)

    Origin of irreversibility, Maxwell's Demon

  • Measurements and information for thermodynamic quantities.
    J. Stat. Phys. 11, 231-255 (1974)
  • Non-equilibrium entropy and irreversibility (monograph)
    (Mathematical Physics Studies Vol 5) Dordrecht: Reidel 1983
  • Irreversibility and randomness in linear response theory.
    J. Stat. Phys. 72, 539-554 (1993)

    Foundations and structure of quantum theory

  • Quantum theory: The mathematical structure and its interpretation.
    Lecture notes KTH 1983, TRITA-TFY-83-30 (1983)
    UP - Modified 990701