Ancilla-assisted sequential approximation of nonlocal unitary operations

URN to cite this document:: urn:nbn:de:bvb:355-epub-218336
DOI to cite this document:: 10.5283/epub.21833

Saberi, Hamed

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Date of publication of this fulltext: 22 Aug 2011 10:12

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Item type:	Article
Journal or Publication Title:	Phys. Rev. A
Publisher:	American Physical Society
Volume:	84
Number of Issue or Book Chapter:	3
Page Range:	032323
Date:	16 September 2011
Institutions:	Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni
Dewey Decimal Classification:	500 Science > 530 Physics
Status:	Published
Refereed:	Yes, this version has been refereed
Created at the University of Regensburg:	Yes
Item ID:	21833

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Abstract

We consider the recently proposed "no-go" theorem of Lamata et al [Phys. Rev. Lett. 101, 180506 (2008)] on the impossibility of sequential implementation of global unitary operations with the aid of an itinerant ancillary system and view the claim within the language of Kraus representation. By virtue of an extremely useful tool for analyzing entanglement properties of quantum operations, namely, ...