|
| related topics |
| {entanglement, phys, rev} |
| {energy, state, states} |
| {temperature, thermal, energy} |
| {operator, operators, space} |
| {cos, sin, state} |
|
Thermal and ground-state entanglement in Heisenberg XX qubit rings
Xiaoguang Wang
abstract: We study the entanglement of thermal and ground states in Heisernberg $XX$
qubit rings with a magnetic field. A general result is found that for
even-number rings pairwise entanglement between nearest-neighbor qubits is
independent on both the sign of exchange interaction constants and the sign of
magnetic fields. As an example we study the entanglement in the four-qubit
model and find that the ground state of this model without magnetic fields is
shown to be a four-body maximally entangled state measured by the $N$-tangle.
- oai_identifier:
- oai:arXiv.org:quant-ph/0203141
- categories:
- quant-ph cond-mat.mes-hall
- comments:
- Four pages and one figure, small changes
- doi:
- 10.1103/PhysRevA.66.034302
- arxiv_id:
- quant-ph/0203141
- journal_ref:
- Phys. Rev. A 66, 034302 (2002).
- created:
- 2002-03-28
- updated:
- 2002-05-26
Full article ▸
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