Multipartite entanglement detection with nonsymmetric probing

TY - JOUR

T1 - Multipartite entanglement detection with nonsymmetric probing

AU - Dellantonio, Luca

AU - Das, Sumanta

AU - Appel, Jürgen

AU - Sørensen, Anders S.

PY - 2017/4/10

Y1 - 2017/4/10

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevA.95.040301

DO - 10.1103/PhysRevA.95.040301

M3 - Journal article

AN - SCOPUS:85017304964

SN - 2469-9926

VL - 95

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

IS - 4

M1 - 040301

ER -