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9 papers · 2 filters
Spin torque and force due to current for general spin textures
Gen Tatara, Hiroshi Kohno, Junya Shibata +2
Non-adiabatic correction to spin transfer torque arising from fast-varying spin texture is calculated treating conduction electron fully quantum mechanically. The torque is non-loc…
Spectroscopy of three strongly coupled flux qubits
A. O. Niskanen, K. Harrabi, F. Yoshihara +2
We have carried out spectroscopic measurements of a system of three strongly coupled four-junction flux qubits. The samples studied cover a wide range of parameters with the coupli…
Decoherence of flux qubits due to 1/f flux noise
F. Yoshihara, K. Harrabi, A. O. Niskanen +2
We have investigated decoherence in Josephson-junction flux qubits. Based on the measurements of decoherence at various bias conditions, we discriminate contributions of different…
Full Counting Statistics of Interacting Electrons
D. A. Bagrets, Y. Utsumi, D. S. Golubev +1
In order to fully characterize the noise associated with electron transport, with its severe consequences for solid-state quantum information systems, the theory of full counting s…
Microscopic Calculation of Spin Torques in Disordered Ferromagnets
Hiroshi Kohno, Gen Tatara, Junya Shibata
Effects of conduction electrons on magnetization dynamics, represented by spin torques, are calculated microscopically in the first order in spatial gradient and time derivative of…
Parity effect in superconducting aluminum single electron transistors with spatial gap profile controlled by film thickness
T. Yamamoto, Y. Nakamura, Yu. A. Pashkin +2
We propose a novel method for suppression of quasiparticle poisoning in Al Coulomb blockade devices. The method is based on creation of a proper energy gap profile along the device…