SPATIAL ROTATION AND TIME-EVOLUTION OPERATOR OF TWO-LEVEL SYSTEMS
2000 ◽
Vol 14
(01)
◽
pp. 101-112
Keyword(s):
All the six kinds of rotation approach with the same form to the evolution problem of arbitrarily time-dependent two-level system are investigated in this paper. A time-dependent two-level system can be viewed as a spin-1/2 system in a time-varying magnetic field. It is shown that for each kind of rotation approach, we can always find a rotating frame in which the direction of the effective magnetic field is fixed. This property reduces the problem of finding the time-evolution operator to the solution of a second-order differential equation. Applications are made to the J C model in quantum optics and the L and au–Zener model in resonance physics.
1994 ◽
Vol 08
(14n15)
◽
pp. 917-927
◽
Keyword(s):
1996 ◽
Vol 10
(14)
◽
pp. 643-651
◽
Keyword(s):
Keyword(s):
1987 ◽
Vol 28
(12)
◽
pp. 2908-2908
◽
Keyword(s):
1989 ◽
Vol 30
(7)
◽
pp. 1522-1524
◽
Keyword(s):
2017 ◽
Vol 839
◽
pp. 012015
◽