Quantum information processing in phase space: A modular variables approach

Quantum mechanical observers: a phase space approach

A quantum mechanical observer might be describable as having a reference system that is a superposition of classical inertial reference frames. The present paper suggests a possible weighting function in such superpositions, determined by the product of the observer’s wavefunction and the Fourier transform of the wavefunction at each point in phase space. This suggestion is made because each of...

Quantum information approach to quantum phase transitions

Quantum phase transitions of a many-body system at zero temperature are characterized by the change of the ground state properties as model parameter g in the system Hamiltonian H(g) is varied across the transition point. People think that structures of the ground-state wavefunction become qualitatively different across the transition point. That is, if we calculate the fidelity, a concept emer...

A not on modular hyperconvex space

Stochastic Inflation: The Quantum Phase Space Approach

In this paper a quantum mechanical phase space picture is constructed for coarsegrained free quantum fields in an inflationary Universe. The appropriate stochastic quantum Liouville equation is derived. Explicit solutions for the phase space quantum distribution function are found for the cases of power law and exponential expansions. The expectation values of dynamical variables with respect t...

A note on modular hyperconvex space