Optimal Purification of Single Qubits

1998/12/26 by J. I. Cirac, Artur Ekert, A. K. Ekert +2 · 10 citations
Computer Science · Physics and Astronomy · #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #quant-ph

paper · pdf · doi:10.1103/physrevlett.82.4344

published as Phys.Rev.Lett. 82 (1999) 4344-4347 · 4 pages, 1 figure

arxiv created 1998/12/26 · openalex publication_date 1999/05/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We introduce a new decomposition of the multiqubit states of the form \ensuremathρ^\ensuremath\bigotimesN and employ it to construct the optimal single qubit purification procedure. The same decomposition allows us to study optimal quantum cloning and state estimation of mixed states.

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