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28 March 2024
 
  » arxiv » quant-ph/9808026

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Continuous quantum measurement with particular output: pure wavefunction evolution instead of decoherence
Alexander N. Korotkov ;
Date 17 Aug 1998
Subject Quantum Physics; Mesoscopic Systems and Quantum Hall Effect | quant-ph cond-mat.mes-hall
AbstractWe consider a continuous measurement of a two-level system (double-dot) by weakly coupled detector (tunnel point contact nearby). While usual treatment leads to the gradual system decoherence due to the measurement, we show that the knowledge of the measurement result can restore the pure wavefunction at any time (this can be experimentally verified). The formalism allows to write a simple Langevin equation for the random evolution of the system density matrix which is reflected and caused by the stochastic detector output. Gradual wavefunction ``collapse’’ and quantum Zeno effect are naturally described by the equation.
Source arXiv, quant-ph/9808026
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