A Discrete Phase-Space Calculus for Quantum Spins based on a Reconstruction Method using Coherent States
| dc.creator | Weigert, Stefan | |
| dc.date | 1999-04-28 | |
| dc.date.accessioned | 2026-07-07T06:16:27Z | |
| dc.date.available | 2026-07-07T06:16:27Z | |
| dc.description | To reconstruct a mixed or pure quantum state of a spin s is possible through coherent states: its density matrix is fixed by the probabilities to measure the value s along 4s(s+1) appropriately chosen directions in space. Thus, after inverting the experimental data, the statistical operator is parametrized entirely by expectation values. On this basis, a symbolic calculus for quantum spins is developed, the `expectation-value representation.' It resembles the Moyal representation for SU(2) but two important differences exist. On the one hand, the symbols take values on a discrete set of points in phase space only. On the other hand, no quasi-probabilities - that is, phase-space distributions with negative values - are encountered in this approach. | |
| dc.description | Latex2e, 9 pages | |
| dc.identifier | https://arxiv.org/abs/quant-ph/9904095 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/9904095 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/94065 | |
| dc.subject | Quantum Physics | |
| dc.title | A Discrete Phase-Space Calculus for Quantum Spins based on a Reconstruction Method using Coherent States | |
| dc.type | text |