dorsal/arxiv
View SchemaQuantum Time Evolution in Terms of Nonredundant Expectation Values
| Authors | Stefan Weigert |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9903103 |
| URL | https://arxiv.org/abs/quant-ph/9903103 |
| DOI | 10.1103/PhysRevLett.84.802 |
| Journal | Phys.Rev.Lett.84:802,2000 |
Abstract
Each scheme of state reconstruction comes down to parametrize the state of a quantum system by expectation values or probabilities directly measurable in an experiment. It is argued that the time evolution of these quantities provides an unambiguous description of the quantal dynamics. This is shown explicitly for a single spin s, using a quorum of expectation values which contains no redundant information. The quantum mechanical time evolution of the system is rephrased in terms of a closed set of linear first-order differential equations coupling (2s+1)^2 expectation values. This `realization' of the dynamical law refers neither to the wavefunction of the system nor to its statistical operator.
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"abstract": "Each scheme of state reconstruction comes down to parametrize the state of a\nquantum system by expectation values or probabilities directly measurable in an\nexperiment. It is argued that the time evolution of these quantities provides\nan unambiguous description of the quantal dynamics. This is shown explicitly\nfor a single spin s, using a quorum of expectation values which contains no\nredundant information. The quantum mechanical time evolution of the system is\nrephrased in terms of a closed set of linear first-order differential equations\ncoupling (2s+1)^2 expectation values. This `realization\u0027 of the dynamical law\nrefers neither to the wavefunction of the system nor to its statistical\noperator.",
"arxiv_id": "quant-ph/9903103",
"authors": [
"Stefan Weigert"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.84.802",
"journal_ref": "Phys.Rev.Lett.84:802,2000",
"title": "Quantum Time Evolution in Terms of Nonredundant Expectation Values",
"url": "https://arxiv.org/abs/quant-ph/9903103"
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