2021/04/30 by Jacob L. Beckey, N. Gigena, Patrick J. Coles +1
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.127.140501
published as Phys. Rev. Lett. 127, 140501 (2021) · 5+15 pages. 3+4 figures. Small errors in supplementary material corrected
arxiv created 2022/01/04 · arxiv updated 2022/01/05
Multipartite entanglement is an essential resource for quantum communication, quantum computing, quantum sensing, and quantum networks. The utility of a quantum state, |ψ⟩, for these applications is often directly related to the degree or type of entanglement present in |ψ⟩. 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.