Single-electron charge qubit in a double quantum dot

Toshimasa Fujisawa; Toshiaki Hayashi; Sung Woo Jung; Yoon Ha Jeong; Yoshiro Hirayama

doi:10.1007/0-387-31143-2_34

Single-electron charge qubit in a double quantum dot

Toshimasa Fujisawa, Toshiaki Hayashi, Sung Woo Jung, Yoon Ha Jeong, Yoshiro Hirayama

Research output: Chapter in Book/Report/Conference proceeding › Chapter

3 Citations (Scopus)

Abstract

A semiconductor double quantum dot provides a simple artificial two-level system (qubit) that can be manipulated by electronic signals. Full one-qubit operation is demonstrated with a high-speed voltage pulse. In addition, strength of decoherence can be controlled to allow efficient initialization of the qubit. Remaining uncontrolled decoherence is discussed with background charge fluctuations, cotunneling, and electron-phonon coupling. Moreover, charge detection of a double dot is demonstrated with a quantum-point-contact charge detector.

Original language	English
Title of host publication	Quantum Computing in Solid State Systems
Publisher	Springer New York
Pages	279-287
Number of pages	9
ISBN (Print)	0387263322, 9780387263328
DOIs	https://doi.org/10.1007/0-387-31143-2_34
Publication status	Published - 2006 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1007/0-387-31143-2_34

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AU - Fujisawa, Toshimasa

AU - Hayashi, Toshiaki

AU - Jung, Sung Woo

AU - Jeong, Yoon Ha

AU - Hirayama, Yoshiro

PY - 2006/12/1

Y1 - 2006/12/1

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AB - A semiconductor double quantum dot provides a simple artificial two-level system (qubit) that can be manipulated by electronic signals. Full one-qubit operation is demonstrated with a high-speed voltage pulse. In addition, strength of decoherence can be controlled to allow efficient initialization of the qubit. Remaining uncontrolled decoherence is discussed with background charge fluctuations, cotunneling, and electron-phonon coupling. Moreover, charge detection of a double dot is demonstrated with a quantum-point-contact charge detector.

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BT - Quantum Computing in Solid State Systems

PB - Springer New York

ER -

Single-electron charge qubit in a double quantum dot

Abstract

ASJC Scopus subject areas

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