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Proceedings Paper

Quantum Fisher information and the qudit depolarization channel
Author(s): Michael Frey; David Collins
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Paper Abstract

The quantum Fisher information is derived for the task of identifying the qudit depolarizing channel with any dimension. The identification scheme in which a pure state channel input is entangled with an ancilla system is shown to dominate other schemes for all qudit depolarizing channels of any dimension and any depolarizing rate. This extends known results for the qubit depolarizing channel. This dominance, though, is not robust; if the ancilla system itself undergoes any degree of depolarization, no matter how small, entanglement with the ancilla is no longer necessarily optimal. The quantum score operator for the qudit depolarizing channel has a special "quasi-classical" form, readily yielding these various results.

Paper Details

Date Published: 27 April 2009
PDF: 7 pages
Proc. SPIE 7342, Quantum Information and Computation VII, 73420N (27 April 2009); doi: 10.1117/12.818668
Show Author Affiliations
Michael Frey, Bucknell Univ. (United States)
David Collins, Mesa State College (United States)

Published in SPIE Proceedings Vol. 7342:
Quantum Information and Computation VII
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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