On the fidelity of mixed states of two qubits

Preprint

3 March 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.quant-ph/0203073

Abstract

We consider a single copy of a mixed state of two qubits and show how its fidelity or maximal singlet fraction is related to the entanglement measures concurrence and negativity. We characterize the extreme points of the convex set of states with constant fidelity, and use this to prove tight lower and upper bounds on the fidelity for a given amount of entanglement.

Keywords

MEASURES CONCURRENCE
CONSTANT FIDELITY
SINGLET FRACTION
MIXED STATES
SINGLE COPY
PROVE TIGHT
TWO QUBITS

All Related Versions

Version 1, 2002-03-15, ArXiv
Version 2, 2002-03-17, ArXiv
Version 3, 2003-03-03, ArXiv
Published version: Physical Review A, 66 (2), 022307.

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