Real-time observation of charge states and energy relaxation in a double quantum dot

Toshiaki Hayashi; Toshimasa Fujisawa; Ritsuya Tomita; Yoshiro Hirayama

doi:10.1143/JJAP.45.3629

Real-time observation of charge states and energy relaxation in a double quantum dot

Toshiaki Hayashi, Toshimasa Fujisawa, Ritsuya Tomita, Yoshiro Hirayama

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

2 Citations (Scopus)

Abstract

We performed real-time observation of charge states in a double quantum dot (QD) by monitoring the current passing through an adjacent quantum point contact (QPC). The position of the QPC was chosen in such a way that the Coulomb coupling of the QPC to one QD is made stronger than to the other QD, so that the QPC current can clearly resolve the charge states of the double QD. With a response time of ∼200 μs, we also investigated the energy relaxation time T₁ of the double QD by applying rectangular voltage pulses to the double QD. We confirmed that T₁ can be made sufficiently longer than the response time of the QPC.

Original language	English
Pages (from-to)	3629-3632
Number of pages	4
Journal	Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume	45
Issue number	4 B
DOIs	https://doi.org/10.1143/JJAP.45.3629
Publication status	Published - 2006 Apr 25
Externally published	Yes

Keywords

Charge qubit
Double quantum dot
Energy relaxation
Quantum point contact
Single-charge detection

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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10.1143/JJAP.45.3629

Cite this

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abstract = "We performed real-time observation of charge states in a double quantum dot (QD) by monitoring the current passing through an adjacent quantum point contact (QPC). The position of the QPC was chosen in such a way that the Coulomb coupling of the QPC to one QD is made stronger than to the other QD, so that the QPC current can clearly resolve the charge states of the double QD. With a response time of ∼200 μs, we also investigated the energy relaxation time T1 of the double QD by applying rectangular voltage pulses to the double QD. We confirmed that T1 can be made sufficiently longer than the response time of the QPC.",

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T1 - Real-time observation of charge states and energy relaxation in a double quantum dot

AU - Hayashi, Toshiaki

AU - Fujisawa, Toshimasa

AU - Tomita, Ritsuya

AU - Hirayama, Yoshiro

PY - 2006/4/25

Y1 - 2006/4/25

N2 - We performed real-time observation of charge states in a double quantum dot (QD) by monitoring the current passing through an adjacent quantum point contact (QPC). The position of the QPC was chosen in such a way that the Coulomb coupling of the QPC to one QD is made stronger than to the other QD, so that the QPC current can clearly resolve the charge states of the double QD. With a response time of ∼200 μs, we also investigated the energy relaxation time T1 of the double QD by applying rectangular voltage pulses to the double QD. We confirmed that T1 can be made sufficiently longer than the response time of the QPC.

AB - We performed real-time observation of charge states in a double quantum dot (QD) by monitoring the current passing through an adjacent quantum point contact (QPC). The position of the QPC was chosen in such a way that the Coulomb coupling of the QPC to one QD is made stronger than to the other QD, so that the QPC current can clearly resolve the charge states of the double QD. With a response time of ∼200 μs, we also investigated the energy relaxation time T1 of the double QD by applying rectangular voltage pulses to the double QD. We confirmed that T1 can be made sufficiently longer than the response time of the QPC.

KW - Charge qubit

KW - Double quantum dot

KW - Energy relaxation

KW - Quantum point contact

KW - Single-charge detection

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Real-time observation of charge states and energy relaxation in a double quantum dot

Abstract

Keywords

ASJC Scopus subject areas

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