Measuring polynomial functions of states
| dc.creator | Brun, Todd A. | |
| dc.date | 2004-01-12 | |
| dc.date | 2004-08-30 | |
| dc.date.accessioned | 2026-07-07T06:08:47Z | |
| dc.date.available | 2026-07-07T06:08:47Z | |
| dc.description | In this paper I show that any $m$th-degree polynomial function of the elements of the density matrix $ρ$ can be determined by finding the expectation value of an observable on $m$ copies of $ρ$, without performing state tomography. Since a circuit exists which can approximate the measurement of any observable, in principle one can find a circuit which will estimate any such polynomial function by averaging over many runs. I construct some simple examples and compare these results to existing procedures. | |
| dc.description | Minor revisions in response to referee comments | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0401067 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0401067 | |
| dc.identifier | Quantum Information and Computation 4, 401 (2004). | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/91751 | |
| dc.subject | Quantum Physics | |
| dc.title | Measuring polynomial functions of states | |
| dc.type | text |