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quant-ph2004
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…
quant-ph2004
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…
quant-ph2004
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…