40 citations · 40 across the 1 of their papers we have counts for
7 papers
Geometric phase in open systems: beyond the Markov approximation and weak coupling limit
X. X. Yi, D. M. Tong, L. C. Wang +2
Beyond the quantum Markov approximation and the weak coupling limit, we present a general theory to calculate the geometric phase for open systems with and without conserved energy…
Quantitative conditions do not guarantee the validity of the adiabatic approximation
D. M. Tong, K. Singh, L. C. Kwek +1
In this letter, we point out that the widely used quantitative conditions in the adiabatic theorem are insufficient in that they do not guarantee the validity of the adiabatic appr…
Operator-sum representation of time-dependent density operators and its applications
D. M. Tong, L. C. Kwek, C. H. Oh +2
We show that any arbitrary time-dependent density operator of an open system can always be described in terms of an operator-sum representation regardless of its initial condition…
General formalism of Hamiltonians for realizing a prescribed evolution of a qubit
D. M. Tong, Jing-Ling Chen, L. C. Kwek +2
We investigate the inverse problem concerning the evolution of a qubit system, specifically we consider how one can establish the Hamiltonians that account for the evolution of a q…
A note on the geometric phase in adiabatic approximation
D. M. Tong, K. Singh, L. C. Kwek +1
The adiabatic theorem shows that the instantaneous eigenstate is a good approximation of the exact solution for a quantum system in adiabatic evolution. One may therefore expect th…
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…