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5 papers · 2 filters
Quantum noise in the Josephson charge qubit
O. Astafiev, Yu. A. Pashkin, Y. Nakamura +2
We study decoherence of the Josephson charge qubit by measuring energy relaxation and dephasing with help of the single-shot readout. We found that the dominant energy relaxation p…
Four-electron shell structures and an interacting two-electron system in carbon nanotube quantum dots
S. Moriyama, T. Fuse, M. Suzuki +2
Low-temperature transport measurements have been carried out on single-wall carbon nanotube quantum dots in a weakly coupled regime in magnetic fields up to 8 Tesla. Four-electron…
Noncommutative geometry and nonabelian Berry phase in the wave-packet dynamics of Bloch electrons
Ryuichi Shindou, Ken-Ichiro Imura
Motivated by a recent proposal on the possibility of observing a monopole in the band structure, and by an increasing interest on the role of Berry phase in spintronics, we studied…
Effect of Spin Current on Uniform Ferromagnetism: Domain Nucleation
Junya Shibata, Gen Tatara, Hiroshi Kohno
Large spin current applied to a uniform ferromagnet leads to a spin-wave instability as pointed out recently. In this paper, it is shown that such spin-wave instability is absent i…
Single-shot measurement of the Josephson charge qubit
O. Astafiev, Yu. A. Pashkin, T. Yamamoto +2
We demonstrate single-shot readout of quantum states of the Josephson charge qubit. The quantum bits are transformed into and stored as classical bits (charge quanta) in a dynamic…