Article (Scientific journals)
Absolute-separability witnesses for symmetric multiqubit states
Serrano Ensástiga, Eduardo; Denis, Jérôme; Martin, John
2024In Physical Review. A, 109 (2)
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Abstract :
[en] The persistent separability of certain quantum states, known as symmetric absolutely separable (SAS), under symmetry-preserving global unitary transformations is of key significance in the context of quantum resources for bosonic systems. In this paper, we develop criteria for detecting SAS states of any number of qubits. Our approach is based on the Glauber-Sudarshan P representation for finite-dimensional quantum systems. We introduce three families of SAS witnesses, one linear and two nonlinear in the eigenvalues of the state, formulated respectively as an algebraic inequality or a quadratic optimization problem. These witnesses are capable of identifying more SAS states than previously known counterparts. We also explore the geometric properties of the subsets of SAS states detected by our witnesses, shedding light on their distinctions.
Disciplines :
Physics
Author, co-author :
Serrano Ensástiga, Eduardo  ;  Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Denis, Jérôme  ;  Université de Liège - ULiège > Département de physique > Optique quantique
Martin, John  ;  Université de Liège - ULiège > Département de physique
Language :
English
Title :
Absolute-separability witnesses for symmetric multiqubit states
Publication date :
22 February 2024
Journal title :
Physical Review. A
ISSN :
2469-9926
eISSN :
2469-9934
Publisher :
American Physical Society (APS)
Volume :
109
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ULiège - Université de Liège [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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