Engineering topics

Jingtao, Zhang

Publications and source records attributed to Jingtao, Zhang.

3 records

DOE OSTI2011

Extracting the information of scattering potential using angular distributions of rescattered photoelectrons

Rescattered photoelectrons are greatly affected by the binding potential of the parent core, while directly emitted photoelectrons not. They are of comparable probability amplitudes at the onset of the plateau in the kinetic energy spectra of photoelectrons, which leads to the photoelectron angular distributions varying distinctively with binding potential of the targets. We exhibit such variations and propose that the variations can be used to extract potential information of the target core.

74 ATOMIC AND MOLECULAR PHYSICS↗

DOE OSTI2011

Comment on ''Teleportation of two-mode squeezed states''

We investigate the teleportation scheme of two-mode squeezed states proposed by Adhikari et al.[S. Adhikari et al., Phys. Rev. A 77, 012337 (2008)]. It uses four-mode entangled states to teleport two-mode squeezed states. The fidelity between the original two-mode squeezed states and teleported ones is calculated. The maximal fidelity value of Adhikari's protocol is 0.38, which is incompatible with the fidelity definition with the maximal value 1. In our opinion, one reason is that they calculate the fidelity for multimodes Gaussian states using the fidelity formula for single-mode ones. Another reason is that the covariance matrix of output states should be what is obtained after applying the linear unitary Bogoliubov operations (two cascaded Fourier transformations) on the covariance matrix given in Eq. (12) in their paper. These two reasons result in the incomparable results. In addition, Adhikari's protocol can be simplified to be easily implemented.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗

DOE OSTI2011

Continuous-variable quantum teleportation in bosonic structured environments

The effects of dynamics of continuous-variable entanglement under the various kinds of environments on quantum teleportation are quantitatively investigated. Only under assumption of the weak system-reservoir interaction, the evolution of teleportation fidelity is analytically derived and is numerically plotted in terms of environment parameters including reservoir temperature and its spectral density, without Markovian and rotating wave approximations. We find that the fidelity of teleportation is a monotonically decreasing function for Markovian interaction in Ohmic-like environments, while it oscillates for non-Markovian ones. According to the dynamical laws of teleportation, teleportation with better performances can be implemented by selecting the appropriate time.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗