Propagation of local decohering action in distributed quantum systems

Details Propagation of local decohering action in distributed quantum systems Propagation of local decohering action in distributed quantum systems

1999-09-09

arxiv.org/abs/quant-ph/9909028v3

Phys. Rev. A 62, 022118 (July 2000)

Physics

Quantum Physics

6 REVTeX pages, no figures. Introduction and discussion sections are extended

Scientific paper

10.1103/PhysRevA.62.022118

We study propagation of the decohering influence caused by a local measurement performed on a distributed quantum system. As an example, the gas of bosons forming a Bose-Einstein condensate is considered. We demonstrate that the local decohering perturbation exerted on the measured region propagates over the system in the form of a decoherence wave, whose dynamics is governed by elementary excitations of the system. We argue that the post-measurement evolution of the system (determined by elementary excitations) is of importance for transfer of decoherence, while the initial collapse of the wave function has negligible impact on the regions which are not directly affected by the measurement.

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