Quantum phase transitions in coupled two-level atoms in a single-mode cavity

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.053841· OSTI ID:21528757

Qinghu, Chen ^[1]; Tao, Liu ^[2]; Yuyu, Zhang ^[3]; Kelin, Wang ^[4]

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1. Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004 (China)
2. Department of Physics, Southwest University of Science and Technology, Mianyang 621010 (China)
3. Department of Physics, Zhejiang University, Hangzhou 310027 (China)
4. Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)

The dipole-coupled two-level atoms (qubits) in a single-mode resonant cavity are studied by extended bosonic coherent states. The numerical solution is presented. The first-order quantum phase transitions may occur in finite systems, in contrast to the original Dicke model. This system also exhibits a second-order quantum phase transition from the normal to the superradiant phase, as in the original Dicke model. Finite-size scaling for several observables - such as average fidelity susceptibility, order parameter, and concurrence - is performed for different interatomic interactions. The scaling exponents obtained suggest that interatomic interactions do not change the universality class.

• OSTI ID: 21528757
• Journal Information: Physical Review. A, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevA.82.053841; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ANNIHILATION OPERATORS
ATOMS
CAVITY RESONATORS
DIPOLES
EIGENSTATES
INTERACTIONS
NUMERICAL SOLUTION
ORDER PARAMETERS
PHASE TRANSFORMATIONS
QUBITS
SCALING
DIMENSIONLESS NUMBERS
ELECTRONIC EQUIPMENT
EQUIPMENT
INFORMATION
MATHEMATICAL OPERATORS
MATHEMATICAL SOLUTIONS
MULTIPOLES
QUANTUM INFORMATION
QUANTUM OPERATORS
RESONATORS