dorsal/arxiv
View SchemaContinuous quantum measurement with observer: pure wavefunction evolution instead of decoherence
| Authors | Alexander N. Korotkov |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9807051 |
| URL | https://arxiv.org/abs/quant-ph/9807051 |
Abstract
We 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.
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"abstract": "We consider a continuous measurement of a two-level system (double-dot) by\nweakly coupled detector (tunnel point contact nearby). While usual treatment\nleads to the gradual system decoherence due to the measurement, we show that\nthe knowledge of the measurement result can restore the pure wavefunction at\nany time (this can be experimentally verified). The formalism allows to write a\nsimple Langevin equation for the random evolution of the system density matrix\nwhich is reflected and caused by the stochastic detector output. Gradual\nwavefunction ``collapse\u0027\u0027 and quantum Zeno effect are naturally described by\nthe equation.",
"arxiv_id": "quant-ph/9807051",
"authors": [
"Alexander N. Korotkov"
],
"categories": [
"quant-ph",
"cond-mat.mes-hall"
],
"title": "Continuous quantum measurement with observer: pure wavefunction evolution instead of decoherence",
"url": "https://arxiv.org/abs/quant-ph/9807051"
},
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