Remark on multi-particle observables and entangled states with constant complexity
| dc.creator | Janzing, Dominik | |
| dc.creator | Beth, Thomas | |
| dc.date | 2000-03-24 | |
| dc.date.accessioned | 2026-07-07T05:59:46Z | |
| dc.date.available | 2026-07-07T05:59:46Z | |
| dc.description | We show that every density matrix of an n-particle system prepared by a quantum network of constant depth is asymptotically commuting with the mean-field observables. We introduce certain pairs of hypersurfaces in the space of density matrices and give lower bounds for the depth of a network which prepares states lying outside those pairs. The measurement of an observable which is not asymptotically commuting with the mean-field observables requires a network of depth in the order of log n, if one demands the measurement to project the state into the eigenspace of the measured observable. | |
| dc.description | 7 pages, Revtex | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0003117 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0003117 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/88804 | |
| dc.subject | Quantum Physics | |
| dc.title | Remark on multi-particle observables and entangled states with constant complexity | |
| dc.type | text |