Operation of the qubit based on photon-assisted tunneling in a coupled quantum-dot system and the influence of dephasing

Z. T. Jiang; J. Peng; J. Q. You; H. Z. Zheng

Operation of the qubit based on photon-assisted tunneling in a coupled quantum-dot system and the influence of dephasing

Z. T. Jiang^*, J. Peng, J. Q. You, H. Z. Zheng

^*Corresponding author for this work

CAS - Institute of Semiconductors

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We derive the generalized rate equation for the coupled quantum-dot (QD) system irradiated by a microwave field in the presence of a quantum point contact. It is shown that when a microwave field is tuned in resonance with the energy difference between the ground states of two QD's, the photon-assisted tunneling occurs and, as a result, the coupled QD system may be used as the single qubit. Furthermore, we show that the oscillating current through the detector decays drastically as the dephasing rate increases, indicating clearly the influence of the dephasing effect induced by the quantum point contact used as a detecting device.

Original language	English
Article number	153308
Pages (from-to)	1533081-1533084
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	15
Publication status	Published - 15 Apr 2002
Externally published	Yes

Cite this

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title = "Operation of the qubit based on photon-assisted tunneling in a coupled quantum-dot system and the influence of dephasing",

abstract = "We derive the generalized rate equation for the coupled quantum-dot (QD) system irradiated by a microwave field in the presence of a quantum point contact. It is shown that when a microwave field is tuned in resonance with the energy difference between the ground states of two QD's, the photon-assisted tunneling occurs and, as a result, the coupled QD system may be used as the single qubit. Furthermore, we show that the oscillating current through the detector decays drastically as the dephasing rate increases, indicating clearly the influence of the dephasing effect induced by the quantum point contact used as a detecting device.",

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T1 - Operation of the qubit based on photon-assisted tunneling in a coupled quantum-dot system and the influence of dephasing

AU - Jiang, Z. T.

AU - Peng, J.

AU - You, J. Q.

AU - Zheng, H. Z.

PY - 2002/4/15

Y1 - 2002/4/15

N2 - We derive the generalized rate equation for the coupled quantum-dot (QD) system irradiated by a microwave field in the presence of a quantum point contact. It is shown that when a microwave field is tuned in resonance with the energy difference between the ground states of two QD's, the photon-assisted tunneling occurs and, as a result, the coupled QD system may be used as the single qubit. Furthermore, we show that the oscillating current through the detector decays drastically as the dephasing rate increases, indicating clearly the influence of the dephasing effect induced by the quantum point contact used as a detecting device.

AB - We derive the generalized rate equation for the coupled quantum-dot (QD) system irradiated by a microwave field in the presence of a quantum point contact. It is shown that when a microwave field is tuned in resonance with the energy difference between the ground states of two QD's, the photon-assisted tunneling occurs and, as a result, the coupled QD system may be used as the single qubit. Furthermore, we show that the oscillating current through the detector decays drastically as the dephasing rate increases, indicating clearly the influence of the dephasing effect induced by the quantum point contact used as a detecting device.

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M3 - Article

AN - SCOPUS:0037089284

SN - 0163-1829

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 15

M1 - 153308

ER -

Operation of the qubit based on photon-assisted tunneling in a coupled quantum-dot system and the influence of dephasing

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