Computable and operationally meaningful multipartite entanglement measures

Abstract

Multipartite entanglement is an essential resource for quantum communication, quantum computing, quantum sensing, and quantum networks. The utility of a quantum state, $|\psi ⟩$, for these applications is often directly related to the degree or type of entanglement present in $|\psi ⟩$. Therefore, efficiently quantifying and characterizing multipartite entanglement is of paramount importance. In this work, we introduce a family of multipartite entanglement measures, called Concentratable Entanglements. Several well-known entanglement measures are recovered as special cases of our family of measures, and hence we provide a general framework for quantifying multipartite entanglement. We prove that the entire family does not increase, on average, under Local Operations and Classical Communications. We also provide an operational meaning for these measures in terms of probabilistic concentration of entanglement into Bell pairs. Finally, we show that these quantities can be efficiently estimated on a quantum computer by implementing a parallelized SWAP test, opening up a research direction for measuring multipartite entanglement on quantum devices.

5+15 pages. 3+4 figures. Small errors in supplementary material corrected

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• Theory for Equivariant Quantum Neural Networks
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• On the practical usefulness of the Hardware Efficient Ansatz
• Multi-Neutrino Entanglement and Correlations in Dense Neutrino Systems
• Detecting entanglement in quantum many-body systems via permutation moments
• Entangled Datasets for Quantum Machine Learning
• Classical Splitting of Parametrized Quantum Circuits
• Testing symmetry on quantum computers
• Multipartite entanglement measures via Bell basis measurements
• A Hierarchy of Multipartite Correlations Based on Concentratable Entanglement
• Complete Genuine Multipartite Entanglement Monotone
• Geometric genuine multipartite entanglement for four-qubit systems
• Generalising multipartite concentratable entanglement for practical applications: mixed, qudit, and optical states