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Proceedings Paper

Coupled Josephson quantum bits
Author(s): Jaw-Shen Tsai; T. Yamamoto; Yu. A. Pashkin; O. Astafiev; Y. Nakamura
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Paper Abstract

The technologies of Josephson-junction-based qubits have been progressing rapidly, ever since its first demonstration by a superconducting charge qubit1. A variety of systems have been implemented with remarkable progress in coherence time and read-out schemes. Although the current level of this solid-state device is still not as advanced as that of the most advanced microscopic-system-based qubits, these developments, together with the potential scalability, have renewed its position as a strong candidate as a building block for the quantum computer. Recently, coherent oscillation and microwave spectroscopy in capacitively-coupled superconducting qubits have been reported. The next challenging step toward quantum computation is a realization of logic gates. Here we demonstrate a conditional gate operation using a pair of coupled superconducting charge qubits. Using a pulse technique, we prepare different input states and show that they can be transformed by controlled-NOT (C-NOT) gate operation in the amplitude of the states. Although the phase evolution during the gate operation is still to be clarified, the present results are a major step toward the realization of a universal solid-state quantum gate.

Paper Details

Date Published: 25 May 2004
PDF: 8 pages
Proc. SPIE 5472, Noise and Information in Nanoelectronics, Sensors, and Standards II, (25 May 2004); doi: 10.1117/12.547408
Show Author Affiliations
Jaw-Shen Tsai, NEC Corp. (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)
T. Yamamoto, NEC Corp. (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)
Yu. A. Pashkin, RIKEN-The Institute of Physical and Chemical Research (Japan)
O. Astafiev, RIKEN-The Institute of Physical and Chemical Research (Japan)
Y. Nakamura, NEC Corp. (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)


Published in SPIE Proceedings Vol. 5472:
Noise and Information in Nanoelectronics, Sensors, and Standards II
Janusz M. Smulko; Yaroslav Blanter; Mark I. Dykman; Laszlo B. Kish, Editor(s)

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