Multipartite entanglement detection with nonsymmetric probing

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We show that spin-squeezing criteria commonly used for entanglement detection can be erroneous if the probe is not symmetric. We then derive a lower bound on squeezing for separable states in spin systems probed asymmetrically. Using this we further develop a procedure that allows us to verify the degree of entanglement of a quantum state in the spin system. Finally, we apply our method for entanglement verification to existing experimental data, and use it to prove the existence of tripartite entanglement in a spin-squeezed atomic ensemble.

Original languageEnglish
Article number040301
JournalPhysical Review A
Issue number4
Publication statusPublished - 10 Apr 2017


ID: 176851538