One of the main problem in Quantum Information Theory is to test whether a given state of a composite quantum system is entangled or separable. It turns out that within a class of states invariant under the action of the symmetry group this problem considerably simplifies. We analyze multipartite invariant states and the corresponding symmetric quantum channels.
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Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam, GermanyMax Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam, Germany
Singh, Sukhbinder
McMahon, Nathan A.
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Macquarie Univ, Ctr Engn Quantum Syst, Dept Phys & Astron, N Ryde, NSW 2109, Australia
Univ Queensland, Ctr Engn Quantum Syst, Sch Math & Phys, St Lucia, Qld 4072, AustraliaMax Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam, Germany
McMahon, Nathan A.
Brennen, Gavin K.
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Macquarie Univ, Ctr Engn Quantum Syst, Dept Phys & Astron, N Ryde, NSW 2109, AustraliaMax Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Potsdam, Germany