Universität zu Köln

Preti, Francesco, Calarco, Tommaso, Torres, Juan Mauricio ORCID: 0000-0002-7947-6962 and Bernad, Jozsef Zsolt ORCID: 0000-0002-2043-3423 (2022). Optimal two-qubit gates in recurrence protocols of entanglement purification. Phys. Rev. A, 106 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9934

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Abstract

We propose and investigate a method to optimize recurrence entanglement purification protocols. The approach is based on a numerical search in the whole set of SU(4) matrices with the aid of a quasi-Newton algorithm. Our method evaluates average concurrences where the probabilistic occurrence of mixed entangled states is also taken into account. We show for certain families of states that optimal protocols are not necessarily achieved by bilaterally applied controlled-NOT gates. As we discover several optimal solutions, the proposed method offers some flexibility in experimental implementations of entanglement purification protocols and interesting perspectives in quantum information processing.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Preti, Francesco UNSPECIFIED UNSPECIFIED UNSPECIFIED Calarco, Tommaso UNSPECIFIED UNSPECIFIED UNSPECIFIED Torres, Juan Mauricio UNSPECIFIED orcid.org/0000-0002-7947-6962 UNSPECIFIED Bernad, Jozsef Zsolt UNSPECIFIED orcid.org/0000-0002-2043-3423 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-674699
DOI:	10.1103/PhysRevA.106.022422
Journal or Publication Title:	Phys. Rev. A
Volume:	106
Number:	2
Date:	2022
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9934
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language QUANTUM; PARAMETRIZATION Multiple languages Optics; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67469