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4 papers · 2 filters
Geometric phase and gauge theory structure in quantum computing
A. Bruno, A. Capolupo, S. Kak +2
We discuss the presence of a geometrical phase in the evolution of a qubit state and its gauge structure. The time evolution operator is found to be the free energy operator, rathe…
Gauge theory and two level systems
A. Bruno, A. Capolupo, S. Kak +2
We consider the time evolution of a two level system (a two level atom or a qubit) and show that it is characterized by a local (in time) gauge invariant evolution equation. The co…
Entanglement between two atoms in a damping Jaynes-Cummings model
Guo-Feng Zhang, Xin-Chen Xie
The entanglement between two atoms in a damping Jaynes-Cummings model is investigated with different decay coefficients of the atoms from the upper level to other levels under detu…
Measurement-induced disturbance and thermal entanglement in spin models
Guo-Feng Zhang, Zhao-Tan Jiang, Ahmad Abliz
Quantum correlation in two-qubit spin models is investigated by use of measurement-induced disturbance [S. Luo, Phys. Rev. A, 77(2008) 022301]. Its dependences on external magnetic…