Quantum NOT operation and integrability in two-level systems |
| |
Authors: | RM Angelo WF Wreszinski |
| |
Institution: | a Universidade Federal do Paraná, Departamento de Física, Caixa Postal 19044, Curitiba 81531 990, PR, Brazil b Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo 05315 970, SP, Brazil |
| |
Abstract: | We demonstrate the surprising integrability of the classical Hamiltonian associated to a spin 1/2 system under periodic external fields. The one-qubit rotations generated by the dynamical evolution is, on the one hand, close to that of the rotating wave approximation (RWA), on the other hand to two different “average” systems, according to whether a certain parameter is small or large. Of particular independent interest is the fact that both the RWA and the averaging theorem are seen to hold well beyond their expected region of validity. Finally, we determine conditions for the realization of the quantum NOT operation by means of classical stroboscopic maps. |
| |
Keywords: | 03 67 Lx 42 50 Ct 05 45-a |
本文献已被 ScienceDirect 等数据库收录! |
|