An Exactly Solvable Model of an Avalanche-Type Measuring Device: Macroscopic Distinctiveness and Wavefunction Collapse

Details An Exactly Solvable Model of an Avalanche-Type Measuring Device: Macroscopic Distinctiveness and Wavefunction Collapse An Exactly Solvable Model of an Avalanche-Type Measuring Device: Macroscopic Distinctiveness and Wavefunction Collapse

2005-07-26

arxiv.org/abs/quant-ph/0507250v1

Physics

Quantum Physics

Scientific paper

A quantum many-body model is presented with features similar to those of certain particle detectors. The energy spectrum contains a single metastable 'ready'-state and macroscopically-distinct 'pointer' states. Measurements do not pose paradoxes or require interventions outside the field theory formalism. Transitions into classical-like states can be triggered by a single particle with help of the thermal bath. Schroedinger cat states are associated with superpositions of inequivalent vacua, thus relating wavefunction collapse to the dynamics of symmetry breaking in phase transformations.

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