Physics – Quantum Physics
Scientific paper
2010-03-05
Physical Review A 81, 012116 (2010)
Physics
Quantum Physics
13 pages
Scientific paper
It is known that an interacting bipartite system evolves as an entangled state in general, even if it is initially in a separable state. Due to the entanglement of the state, the geometric phase of the system is not equal to the sum of the geometric phases of its two subsystems. However, there may exist a set of states in which the nonlocal interaction does not affect the separability of the states, and the geometric phase of the bipartite system is then always equal to the sum of the geometric phases of its subsystems. In this paper, we illustrate this point by investigating a well known physical model. We give a necessary and sufficient condition in which a separable state remains separable so that the geometric phase of the system is always equal to the sum of the geometric phases of its subsystems.
Kang Lei
Kwek Leong Chuan
Liu Longjiang
Niu C. W.
Tong Dian-Min
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