dorsal/arxiv
View SchemaSpin squeezing as a measure of entanglement in a two qubit system
| Authors | A. Messikh, Z. Ficek, M. R. B. Wahiddin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0305166 |
| URL | https://arxiv.org/abs/quant-ph/0305166 |
| DOI | 10.1103/PhysRevA.68.064301 |
Abstract
We show that two definitions of spin squeezing extensively used in the literature [M. Kitagawa and M. Ueda, Phys. Rev. A {\bf 47}, 5138 (1993) and D.J. Wineland {\it et al.}, Phys. Rev. A {\bf 50}, 67 (1994)] give different predictions of entanglement in the two-atom Dicke system. We analyze differences between the definitions and show that the Kitagawa and Ueda's spin squeezing parameter is a better measure of entanglement than the commonly used spectroscopic spin squeezing parameter. We illustrate this relation by examining different examples of a driven two-atom Dicke system in which spin squeezing and entanglement arise dynamically. We give an explanation of the source of the difference in the prediction of entanglement using the negativity criterion for entanglement. For the examples discussed, we find that the Kitagawa and Ueda's spin squeezing parameter is the sufficient and necessary condition for entanglement.
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"abstract": "We show that two definitions of spin squeezing extensively used in the\nliterature [M. Kitagawa and M. Ueda, Phys. Rev. A {\\bf 47}, 5138 (1993) and\nD.J. Wineland {\\it et al.}, Phys. Rev. A {\\bf 50}, 67 (1994)] give different\npredictions of entanglement in the two-atom Dicke system. We analyze\ndifferences between the definitions and show that the Kitagawa and Ueda\u0027s spin\nsqueezing parameter is a better measure of entanglement than the commonly used\nspectroscopic spin squeezing parameter. We illustrate this relation by\nexamining different examples of a driven two-atom Dicke system in which spin\nsqueezing and entanglement arise dynamically. We give an explanation of the\nsource of the difference in the prediction of entanglement using the negativity\ncriterion for entanglement. For the examples discussed, we find that the\nKitagawa and Ueda\u0027s spin squeezing parameter is the sufficient and necessary\ncondition for entanglement.",
"arxiv_id": "quant-ph/0305166",
"authors": [
"A. Messikh",
"Z. Ficek",
"M. R. B. Wahiddin"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.68.064301",
"title": "Spin squeezing as a measure of entanglement in a two qubit system",
"url": "https://arxiv.org/abs/quant-ph/0305166"
},
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