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quant-ph2003
Quantum nonlocality of Heisenberg XX model with Site-dependent Coupling Strength
Chunfeng Wu, Jing-Ling Chen, D. M. Tong +2
We show that the generalized Bell inequality is violated in the extended Heisenberg model when the temperature is below a threshold value. The threshold temperature values are obta…
quant-ph2003
Geometric phases for non-degenerate and degenerate mixed states
K. Singh, D. M. Tong, K. Basu +2
This paper focuses on the geometric phase of general mixed states under unitary evolution. Here we analyze both non-degenerate as well as degenerate states. Starting with the non-d…