Charge and spin manipulation in a few-electron double dot

J. R. Petta; A. C. Johnson; J. M. Taylor; A. Yacoby; M. D. Lukin; C. M. Marcus; M. P. Hanson; A. C. Gossard

doi:10.1016/j.physe.2006.02.033

Charge and spin manipulation in a few-electron double dot

J. R. Petta, A. C. Johnson, J. M. Taylor, A. Yacoby, M. D. Lukin, C. M. Marcus, M. P. Hanson, A. C. Gossard

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

9 Scopus citations

Abstract

We demonstrate high-speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used to drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T₁ ∼ 16 ns and also provides a lower bound estimate for T₂ ^*of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.

Original language	English (US)
Pages (from-to)	42-46
Number of pages	5
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	34
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physe.2006.02.033
State	Published - Aug 2006

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

Keywords

Charge qubit
Coherent manipulation
Rabi oscillation
Spin qubit

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10.1016/j.physe.2006.02.033

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title = "Charge and spin manipulation in a few-electron double dot",

abstract = "We demonstrate high-speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used to drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T1 ∼ 16 ns and also provides a lower bound estimate for T2 *of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.",

keywords = "Charge qubit, Coherent manipulation, Rabi oscillation, Spin qubit",

author = "Petta, {J. R.} and Johnson, {A. C.} and Taylor, {J. M.} and A. Yacoby and Lukin, {M. D.} and Marcus, {C. M.} and Hanson, {M. P.} and Gossard, {A. C.}",

note = "Funding Information: We acknowledge useful discussions with Sankar Das Sarma, Hans-Andreas Engel, Xuedong Hu, Daniel Loss, Emmanuel Rashba, and Peter Zoller. Funding was provided through the ARO under DAAD55-98-1-0270 and DAAD19-02-1-0070, the DARPA-QuIST program, and the NSF under DMR-0072777, the Harvard Center for Nanoscale Systems, and the Sloan and Packard Foundations.",

year = "2006",

month = aug,

doi = "10.1016/j.physe.2006.02.033",

language = "English (US)",

volume = "34",

pages = "42--46",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Charge and spin manipulation in a few-electron double dot

AU - Petta, J. R.

AU - Johnson, A. C.

AU - Taylor, J. M.

AU - Yacoby, A.

AU - Lukin, M. D.

AU - Marcus, C. M.

AU - Hanson, M. P.

AU - Gossard, A. C.

N1 - Funding Information: We acknowledge useful discussions with Sankar Das Sarma, Hans-Andreas Engel, Xuedong Hu, Daniel Loss, Emmanuel Rashba, and Peter Zoller. Funding was provided through the ARO under DAAD55-98-1-0270 and DAAD19-02-1-0070, the DARPA-QuIST program, and the NSF under DMR-0072777, the Harvard Center for Nanoscale Systems, and the Sloan and Packard Foundations.

PY - 2006/8

Y1 - 2006/8

N2 - We demonstrate high-speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used to drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T1 ∼ 16 ns and also provides a lower bound estimate for T2 *of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.

AB - We demonstrate high-speed manipulation of a few-electron double quantum dot. In the one-electron regime, the double dot forms a charge qubit. Microwaves are used to drive transitions between the (1,0) and (0,1) charge states of the double dot. A local quantum point contact charge detector measures the photon-induced change in occupancy of the charge states. Charge detection is used to measure T1 ∼ 16 ns and also provides a lower bound estimate for T2 *of 400 ps for the charge qubit. In the two-electron regime we use pulsed-gate techniques to measure the singlet-triplet relaxation time for nearly-degenerate spin states. These experiments demonstrate that the hyperfine interaction leads to fast spin relaxation at low magnetic fields. Finally, we discuss how two-electron spin states can be used to form a logical spin qubit.

KW - Charge qubit

KW - Coherent manipulation

KW - Rabi oscillation

KW - Spin qubit

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JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1-2

ER -

Charge and spin manipulation in a few-electron double dot

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