|
| related topics |
| {states, state, optimal} |
| {measurement, state, measurements} |
| {state, phys, rev} |
| {information, entropy, channel} |
| {cos, sin, state} |
| {equation, function, exp} |
| {temperature, thermal, energy} |
| {state, states, entangled} |
| {bell, inequality, local} |
| {alice, bob, state} |
| {classical, space, random} |
| {time, wave, function} |
|
Optimal scheme for estimating a pure qubit state via local measurements
E. Bagan, M. Baig, R. Munoz-Tapia
abstract: We present the optimal scheme for estimating a pure qubit state by means of
local measurements on N identical copies. We give explicit examples for low N.
For large N, we show that the fidelity saturates the collective measurement
bound up to order 1/N. When the signal state lays on a meridian of the Bloch
sphere, we show that this can be achieved without classical communication.
- oai_identifier:
- oai:arXiv.org:quant-ph/0205026
- categories:
- quant-ph
- comments:
- Version to appear in PRL (minor changes, title changed)
- doi:
- 10.1103/PhysRevLett.89.277904
- arxiv_id:
- quant-ph/0205026
- journal_ref:
- Phys. Rev. Lett. 89, 277904 (2002)
- created:
- 2002-05-06
- updated:
- 2002-11-05
Full article ▸
|
|
| related documents |
| 0612123v2 |
| 0107085v1 |
| 9806011v1 |
| 0307132v1 |
| 0406077v1 |
| 9801005v1 |
| 0406104v1 |
| 0407120v1 |
| 0701079v1 |
| 9907101v1 |
| 0605213v2 |
| 0501093v1 |
| 0205195v1 |
| 0701198v1 |
| 0412083v1 |
| 9911056v1 |
| 0403188v1 |
| 0011043v1 |
| 0307193v1 |
| 0310121v1 |
| 9912016v1 |
| 0007101v4 |
| 0507194v1 |
| 0703193v2 |
| 0507218v1 |
|