Qubit Utilizing Charge-number State in Superconducting Nanostructure

Tsai, J. S. and Nakamura, Y. and Pashkin, Yu (2001) Qubit Utilizing Charge-number State in Superconducting Nanostructure. Quantum Info. Comput., 1 (4). pp. 124-128. ISSN 1533-7146

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In single-Cooper-pair box, the number of electrons in the box is quantized and they form a single macroscopic quantum charge-number state, corresponding to the number of excess electrons in the box. By making all the electrodes superconducting, we can couple two neighboring charge-number states coherently. In this way one can create an artificial two-level system. Qubit operations were demonstrated in two different control techniques, dc electric-field gate bias and ac field bias. The dc method was unique compared with the commonly used Rabi-oscillation-type operation. Here the system was biased at the degenerate point of the two states so that the dynamical phase does not develop during the operation. This was the first time that the quantum coherent oscillation was observed in a solid-state device whose quantum states involved a macroscopic number of quantum particles. Multiple-pulse experiments were also carried out and phase control was also demonstrated.

Item Type:
Journal Article
Journal or Publication Title:
Quantum Info. Comput.
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?? general physics and astronomycomputational theory and mathematicsmathematical physicstheoretical computer sciencestatistical and nonlinear physicsnuclear and high energy physicsphysics and astronomy(all) ??
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22 Jan 2019 12:00
Last Modified:
16 Jul 2024 10:57