Quantum theory of successive projective measurements
| dc.creator | Johansen, Lars M. | |
| dc.date | 2007-05-02 | |
| dc.date.accessioned | 2026-07-07T08:43:51Z | |
| dc.date.available | 2026-07-07T08:43:51Z | |
| dc.description | We show that a quantum state may be represented as the sum of a joint probability and a complex quantum modification term. The joint probability and the modification term can both be observed in successive projective measurements. The complex modification term is a measure of measurement disturbance. A selective phase rotation is needed to obtain the imaginary part. This leads to a complex quasiprobability, the Kirkwood distribution. We show that the Kirkwood distribution contains full information about the state if the two observables are maximal and complementary. The Kirkwood distribution gives a new picture of state reduction. In a nonselective measurement, the modification term vanishes. A selective measurement leads to a quantum state as a nonnegative conditional probability. We demonstrate the special significance of the Schwinger basis. | |
| dc.description | 6 pages | |
| dc.identifier | https://arxiv.org/abs/0705.0229 | |
| dc.identifier | http://arxiv.org/abs/0705.0229 | |
| dc.identifier | Phys. Rev. A76, 012119 (2007) | |
| dc.identifier | doi:10.1103/PhysRevA.76.012119 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/142460 | |
| dc.subject | Quantum Physics | |
| dc.title | Quantum theory of successive projective measurements | |
| dc.type | text |