Phys. Rev. Lett. 82, 4344–4347 (1999)

Optimal Purification of Single Qubits

Abstract

References

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J. I. Cirac¹, A. K. Ekert², and C. Macchiavello³
¹Institut für Theoretische Physik, Universität Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
²Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
³Dipartimento di Fisica “A. Volta” and INFM–Unità di Pavia, Via Bassi 6, 27100 Pavia, Italy

Received 28 December 1998; published in the issue dated 24 May 1999

We introduce a new decomposition of the multiqubit states of the form ρ^⊗N 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.82.4344

DOI:

10.1103/PhysRevLett.82.4344

PACS:

03.67.-a, 03.65.Bz

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Phys. Rev. Lett. 82, 4344–4347 (1999)

Optimal Purification of Single Qubits