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5 papers · 2 filters
Single-electron transistors in electromagnetic environments
Michio Watanabe
The current-voltage (I-V) characteristics of single-electron transistors (SETs) have been measured in various electromagnetic environments. Some SETs were biased with one-dimension…
Quantum Spin Pump in S=1/2 antiferromagnetic chains -Holonomy of phase operators in sine-Gordon theory-
Ryuichi Shindou
In this paper, we propose the quantum spin pumping in quantum spin systems where an applied electric field () and magnetic field () cause a finite spin gap to its critical gr…
Electronic states and quantum transport in double-wall carbon nanotubes
Seiji Uryu
Electronic states and transport properties of double-wall carbon nanotubes without impurities are studied in a systematic manner. It is revealed that scattering in the bulk is negl…
Demonstration of conditional gate operation using superconducting charge qubits
T. Yamamoto, Yu. A. Pashkin, O. Astafiev +2
Since the first demonstration of coherent control of a quantum state of a superconducting charge qubit a variety of Josephson-junction-based qubits have been implemented with remar…
Quantum Effects in Small-Capacitance Single Josephson Junctions
Michio Watanabe, David B. Haviland
We have measured the current-voltage (I-V) characteristics of small-capacitance single Josephson junctions at low temperatures (T=0.02-0.6 K), where the strength of the coupling be…