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15 papers · 1 filter
Parametric control of a superconducting flux qubit
S. Saito, T. Meno, M. Ueda +3
Parametric control of a superconducting flux qubit has been achieved by using two-frequency microwave pulses. We have observed Rabi oscillations stemming from parametric transition…
Large-scale electronic-structure theory and nanoscale defects formed in cleavage process of silicon
T. Hoshi, R. Takayama, Y. Iguchi +1
Several methods are constructed for large-scale electronic structure calculations. Test calculations are carried out with up to 10^7 atoms. As an application, cleavage process of s…
Comment on "Quantum Key Distribution with the Blind Polarization Bases"
Qiang Zhang, Xiang-Bin Wang, Yu-Ao Chen +2
We show an eavesdropping scheme, by which the eavesdropper can achieve the full information of the key against the protocol [Kye et al., PRL 95 040501 (2005)] with a probability of…
Optical Magnetoelectric Effect in Multiferroic Materials: Evidence for a Lorentz Force Acting on a Ray of Light
Kei Sawada, Naoto Nagaosa
We theoretically propose that the optical analog of a Lorentz force acting on a ray of light is realized in multiferroic materials such as GaFeO showing the magnetoelectric eff…
Nonlinear Optical Response of Spin Density Wave Insulators
S. A. Jafari, T. Tohyama, S. Maekawa
We calculate the third order nonlinear optical response in the Hubbard model within the spin density wave (SDW) mean field ansatz in which the gap is due to onsite Coulomb repulsio…
Generating functional analysis of CDMA detection dynamics
Kazushi Mimura, Masato Okada
We investigate the detection dynamics of the parallel interference canceller (PIC) for code-division multiple-access (CDMA) multiuser detection, applied to a randomly spread, fully…