dorsal/arxiv
View SchemaEntanglement in a Two-Qubit Ising Model Under a Site-Dependent External Magnetic Field
| Authors | Andreas F. Terzis, Emmanuel Paspalakis |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0407230 |
| URL | https://arxiv.org/abs/quant-ph/0407230 |
| DOI | 10.1016/j.physleta.2004.10.063 |
Abstract
We investigate the ground state and the thermal entanglement in the two-qubit Ising model interacting with a site-dependent magnetic field. The degree of entanglement is measured by calculating the concurrence. For zero temperature and for certain direction of the applied magnetic field, the quantum phase transition observed under a uniform external magnetic field disappears once a very small non-uniformity is introduced. Furthermore, we have shown analytically and confirmed numerically that once the direction of one of the magnetic field is along the Ising axis then no entangled states can be produced, independently of the degree of non-uniformity of the magnetic fields on each site.
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"abstract": "We investigate the ground state and the thermal entanglement in the two-qubit\nIsing model interacting with a site-dependent magnetic field. The degree of\nentanglement is measured by calculating the concurrence. For zero temperature\nand for certain direction of the applied magnetic field, the quantum phase\ntransition observed under a uniform external magnetic field disappears once a\nvery small non-uniformity is introduced. Furthermore, we have shown\nanalytically and confirmed numerically that once the direction of one of the\nmagnetic field is along the Ising axis then no entangled states can be\nproduced, independently of the degree of non-uniformity of the magnetic fields\non each site.",
"arxiv_id": "quant-ph/0407230",
"authors": [
"Andreas F. Terzis",
"Emmanuel Paspalakis"
],
"categories": [
"quant-ph"
],
"doi": "10.1016/j.physleta.2004.10.063",
"title": "Entanglement in a Two-Qubit Ising Model Under a Site-Dependent External Magnetic Field",
"url": "https://arxiv.org/abs/quant-ph/0407230"
},
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