Journal
PHYSICAL REVIEW A
Volume 83, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.83.020101
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Funding
- US NSF [0347078, 0622033]
- Singapore Ministry of Education
- National Research Foundation
- Direct For Computer & Info Scie & Enginr [0622033] Funding Source: National Science Foundation
- Division of Computing and Communication Foundations [0622033] Funding Source: National Science Foundation
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We study various types of multipartite states lying near the quantum-classical boundary. The so-called classical states are precisely those in which each party can perfectly identify a locally held state without disturbing the global state, a task known as nondisruptive local state identification (NDLID). We show NDLID to be closely related local broadcasting, and we introduce a class of states called generalized classical states which allow for both NDLID and multipartite broadcasting when the most general quantum measurements are permitted. Simple analytical methods and a physical criterion are given for detecting whether a multipartite state is classical or generalized classical. For deciding the latter, a semidefinite programming algorithm is presented which may find use in other fields such as signal processing.
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