Nonlocality of tripartite orthogonal product states

• URL: http://arxiv.org/abs/2011.03830v1
• Date: Sat, 7 Nov 2020 18:46:24 GMT
• Title: Nonlocality of tripartite orthogonal product states
• Authors: Atanu Bhunia, Indrani Chattopadhyay and Debasis Sarkar
• Abstract summary: We construct a locally indistinguishable subset in $mathbbC2dbigotimesmathbbC2dbigotimesmathbbC2d$. We generalize our method to arbitrary tripartite quantum systems. We prove that a three-qubit GHZ state is sufficient as a resource to distinguish each of the above classes of states.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Local distinguishability of orthogonal product states is an area of active research in quantum information theory. However, most of the relevant results about local distinguishability found in bipartite quantum systems and very few are known in multipartite systems. In this work, we construct a locally indistinguishable subset in ${\mathbb{C}}^{2d}\bigotimes{\mathbb{C}}^{2d}\bigotimes{\mathbb{C}}^{2d}$, $d\geq2$ that contains $18(d-1)$ orthogonal product states. Further, we generalize our method to arbitrary tripartite quantum systems ${\mathbb{C}}^{k}\bigotimes{\mathbb{C}}^{l}\bigotimes{\mathbb{C}}^{m}$. This result enables us to understand further the role of nonlocality without entanglement in multipartite quantum systems. Finally, we prove that a three-qubit GHZ state is sufficient as a resource to distinguish each of the above classes of states.

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