Optimal scheme for estimating a pure qubit state via local measurements
Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física)
Baig i Aleu, Marià, 1955-
(Universitat Autònoma de Barcelona. Departament de Física)
Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society
Date: |
2002 |
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. |
Rights: |
Tots els drets reservats. |
Language: |
Anglès |
Document: |
Article ; Versió publicada |
Published in: |
Physical review letters, Vol. 89, Issue 27 (December 2002) , p. 277904, ISSN 1079-7114 |
DOI: 10.1103/PhysRevLett.89.277904
The record appears in these collections:
Articles >
Published articles
Record created 2014-01-21, last modified 2022-02-13