Journal
PHYSICAL REVIEW A
Volume 79, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.79.012105
Keywords
chaos; Heisenberg model; Ising model; perturbation theory; quantum entanglement
Categories
Funding
- New Century Excellent Talents in University (NCET)
- NSFC [10874151, 90503003, 10429401]
- State Key Program for Basic Research of China [2006CB921206, 2006CB921800]
- Specialized Research Fund [20050335087]
- RGC [HKU-3/05C, HKU7051/06P, HKU7049/07P, HKU7044/08P]
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We introduce an operator fidelity and propose to use its susceptibility for characterizing the sensitivity of quantum systems to perturbations. Two typical models are addressed: One is the transverse Ising model exhibiting a quantum phase transition, and the other is the one-dimensional Heisenberg spin chain with next-nearest-neighbor interactions, which has the degeneracy. It is revealed that the operator fidelity susceptibility is a good indicator of quantum criticality regardless of the system degeneracy.
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