Home > Search Results: Gill, R D.
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Articles, 2 records found
Articles 2 records found  
1.
18 p, 221.7 KB Optimal full estimation of qubit mixed states / Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Ballester, M. A. (University of Utrecht. Department of Mathematics) ; Gill, R. D. (University of Utrecht. Department of Mathematics) ; Monras Blasi, Àlex (Universitat Autònoma de Barcelona. Departament de Física) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We obtain the optimal scheme for estimating unknown qubit mixed states when an arbitrary number N of identically prepared copies is available. We discuss the case of states in the whole Bloch sphere as well as the restricted situation where these states are known to lie on the equatorial plane. [...]
2006 - 10.1103/PhysRevA.73.032301
Physical review. A, Vol. 73, Issue 3 (March 2006) , p. 032301-1-32301-18  
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2.
4 p, 111.3 KB Separable measurement estimation of density matrices and its fidelity gap with collective protocols / Bagán Capella, Emili (Universitat Autònoma de Barcelona. Departament de Física) ; Ballester, M. A. (Centrum voor Wiskunde en Informatica (Amsterdam, Països Baixos)) ; Gill, R. D. (University of Leiden. Department of Mathematics) ; Muñoz Tapia, Ramon (Universitat Autònoma de Barcelona. Departament de Física) ; Romero-Isart, Oriol (Universitat Autònoma de Barcelona. Departament de Física) ; American Physical Society
We show that there exists a gap between the performance of separable and collective measurements in the qubit mixed-state estimation that persists in the large sample limit. We characterize the gap with sharp asymptotic bounds on mean fidelity. [...]
2006 - 10.1103/PhysRevLett.97.130501
Physical review letters, Vol. 97, Issue 13 (September 2006) , p. 130501  
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See also: similar author names
1 Gill, R.
2 Gill, R. D.
1 Gill, Rosalind M.
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