|
| related topics |
| {energy, state, states} |
| {entanglement, phys, rev} |
| {phase, path, phys} |
| {temperature, thermal, energy} |
| {classical, space, random} |
| {observables, space, algebra} |
| {state, algorithm, problem} |
| {spin, pulse, spins} |
| {level, atom, field} |
| {cos, sin, state} |
| {state, states, entangled} |
|
Entanglement in quantum critical spin systems
Tommaso Roscilde, Paola Verrucchi, Andrea Fubini, Stephan Haas, Valerio Tognetti
abstract: We study the field dependence of the entanglement of formation in anisotropic
S=1/2 antiferromagnetic chains and two-leg ladders displaying a T=0
field-driven quantum phase transition. The analysis is carried out via Quantum
Monte Carlo simulations. At zero temperature the entanglement estimators show
abrupt changes at and around criticality, vanishing below the critical field,
in correspondence with an exactly factorized state, and then immediately
recovering a finite value upon passing through the quantum phase transition. At
the quantum critical point, a deep minimum in the pairwise-to-global
entanglement ratio shows that multi-spin entanglement is strongly enhanced;
moreover this signature represents a novel way of detecting the quantum phase
transition of the system, relying entirely on entanglement estimators.
- oai_identifier:
- oai:arXiv.org:quant-ph/0412056
- categories:
- quant-ph cond-mat.str-el
- comments:
- 5 pages, 4 figures. Contributed paper to the MQC2 conference, Naples
2004
- arxiv_id:
- quant-ph/0412056
- created:
- 2004-12-07
Full article ▸
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