Detecting Multipartite Classical States and their Resemblances

Details Detecting Multipartite Classical States and their Resemblances Detecting Multipartite Classical States and their Resemblances

2010-05-24

arxiv.org/abs/1005.4348v2

Phys. Rev. A 83, 020101 (Rapid Communication) (2011)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.83.020101

We study various types of multipartite states lying near the quantum-classical boundary. The class of so-called classical states are precisely those in which each party can perform a projective measurement to identify a locally held state without disturbing the global state, a task known as non-disruptive local state identification (NDLID). We introduce a new class of states called generalized-classical states which allow for NDLID when the most general quantum measurements are permitted. A simple analytic method as well as a physical criterion are presented for detecting whether a multipartite state is classical. To decide whether a state is generalized-classical, we provide a semi-definite programming algorithm which can be adapted for use in other unrelated contexts such as signal processing.

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