We present a scheme to realize entangled states, swap gate and quantum-information transfer for two atoms in cavity QED. The scheme does not require the transfer of quantum information between the atoms and cavity and that the cavity field is only virtually excited, thus the requirement on the quality factor of the cavity is greatly loosened.
In this paper, we present a scheme of controlling chaos in an Er-doped fiber dual-ring laser with one polarized mode by using the linear feedback method. Numerical results show that under some stiffness of feedback the controlled system has negative maximum Lyapunov exponents (MLE) and separate spectra, which demonstrate that controlling the chaotic system into the stable states could be realized by adjusting the feedback stiffness.
We have developed a dual-beam magneto-optical (MO) recording system to test the dynamical properties of MO disks. Magnetic field modulated direct overwrite is realized on this system. The effect of light intensity, linear velocity of disk, modulating frequency and magnetic field intensity on carrier-to-noise ratio is investigated.
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