dorsal/arxiv
View SchemaNote on reversibility of quantum jumps
| Authors | Michael B. Mensky |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0007095 |
| URL | https://arxiv.org/abs/quant-ph/0007095 |
| DOI | 10.1016/0375-9601(96)00636-6 |
| Journal | Physics Letters A 222 (1996) 137-140 |
Abstract
It has been recently proved that a quantum jump may be reversed by a unitary process provided the initial state is restricted by some conditions. The application of such processes for preventing decoherence, for example in quantum computers, was suggested. We shall show that in the situation when the quantum jump is reversible it supplies no information about the initial state additional to the information known beforehand. Therefore the reversibility of this type does not contradict the general statement of quantum measurement theory: a measurement cannot be reversed. As a consequence of this, the coherence of a state (say, in a quantum computer) cannot be restored after it is destroyed by dissipative processes having a character of measurement.
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"abstract": "It has been recently proved that a quantum jump may be reversed by a unitary\nprocess provided the initial state is restricted by some conditions. The\napplication of such processes for preventing decoherence, for example in\nquantum computers, was suggested. We shall show that in the situation when the\nquantum jump is reversible it supplies no information about the initial state\nadditional to the information known beforehand. Therefore the reversibility of\nthis type does not contradict the general statement of quantum measurement\ntheory: a measurement cannot be reversed. As a consequence of this, the\ncoherence of a state (say, in a quantum computer) cannot be restored after it\nis destroyed by dissipative processes having a character of measurement.",
"arxiv_id": "quant-ph/0007095",
"authors": [
"Michael B. Mensky"
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"doi": "10.1016/0375-9601(96)00636-6",
"journal_ref": "Physics Letters A 222 (1996) 137-140",
"title": "Note on reversibility of quantum jumps",
"url": "https://arxiv.org/abs/quant-ph/0007095"
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