Preparing, manipulating, and measuring quantum states on a chip

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

doi:10.1016/j.physe.2006.08.020

Preparing, manipulating, and measuring quantum states on a chip

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

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

6 Scopus citations

Abstract

We use gate voltage control of the exchange interaction to prepare, manipulate, and measure two-electron spin states in a GaAs double quantum dot. By placing two electrons in a single dot at low temperatures we prepare the system in a spin singlet state. The spin singlet is spatially separated by transferring an electron to an adjacent dot. The spatially separated spin singlet state dephases in ∼ 10 ns due to the contact hyperfine interaction with the GaAs host nuclei. To combat the hyperfine dephasing, we develop quantum control techniques based on fast electrical control of the exchange interaction. We demonstrate coherent spin-state rotations in a singlet-triplet qubit and harness the coherent rotations to implement a singlet-triplet spin echo refocusing pulse sequence. The singlet-triplet spin echo extends the spin coherence time to 1.2 μ s.

Original language	English (US)
Pages (from-to)	251-256
Number of pages	6
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	35
Issue number	2
DOIs	https://doi.org/10.1016/j.physe.2006.08.020
State	Published - Dec 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

Keywords

Coherent manipulation
Spin echo
Spin qubit

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10.1016/j.physe.2006.08.020

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title = "Preparing, manipulating, and measuring quantum states on a chip",

abstract = "We use gate voltage control of the exchange interaction to prepare, manipulate, and measure two-electron spin states in a GaAs double quantum dot. By placing two electrons in a single dot at low temperatures we prepare the system in a spin singlet state. The spin singlet is spatially separated by transferring an electron to an adjacent dot. The spatially separated spin singlet state dephases in ∼ 10 ns due to the contact hyperfine interaction with the GaAs host nuclei. To combat the hyperfine dephasing, we develop quantum control techniques based on fast electrical control of the exchange interaction. We demonstrate coherent spin-state rotations in a singlet-triplet qubit and harness the coherent rotations to implement a singlet-triplet spin echo refocusing pulse sequence. The singlet-triplet spin echo extends the spin coherence time to 1.2 μ s.",

keywords = "Coherent manipulation, Spin echo, Spin qubit",

author = "Petta, {J. R.} and Johnson, {A. C.} and Taylor, {J. M.} and Laird, {E. A.} 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 = dec,

doi = "10.1016/j.physe.2006.08.020",

language = "English (US)",

volume = "35",

pages = "251--256",

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

issn = "1386-9477",

publisher = "Elsevier",

number = "2",

}

TY - JOUR

T1 - Preparing, manipulating, and measuring quantum states on a chip

AU - Petta, J. R.

AU - Johnson, A. C.

AU - Taylor, J. M.

AU - Laird, E. A.

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 - 2006/12

Y1 - 2006/12

N2 - We use gate voltage control of the exchange interaction to prepare, manipulate, and measure two-electron spin states in a GaAs double quantum dot. By placing two electrons in a single dot at low temperatures we prepare the system in a spin singlet state. The spin singlet is spatially separated by transferring an electron to an adjacent dot. The spatially separated spin singlet state dephases in ∼ 10 ns due to the contact hyperfine interaction with the GaAs host nuclei. To combat the hyperfine dephasing, we develop quantum control techniques based on fast electrical control of the exchange interaction. We demonstrate coherent spin-state rotations in a singlet-triplet qubit and harness the coherent rotations to implement a singlet-triplet spin echo refocusing pulse sequence. The singlet-triplet spin echo extends the spin coherence time to 1.2 μ s.

AB - We use gate voltage control of the exchange interaction to prepare, manipulate, and measure two-electron spin states in a GaAs double quantum dot. By placing two electrons in a single dot at low temperatures we prepare the system in a spin singlet state. The spin singlet is spatially separated by transferring an electron to an adjacent dot. The spatially separated spin singlet state dephases in ∼ 10 ns due to the contact hyperfine interaction with the GaAs host nuclei. To combat the hyperfine dephasing, we develop quantum control techniques based on fast electrical control of the exchange interaction. We demonstrate coherent spin-state rotations in a singlet-triplet qubit and harness the coherent rotations to implement a singlet-triplet spin echo refocusing pulse sequence. The singlet-triplet spin echo extends the spin coherence time to 1.2 μ s.

KW - Coherent manipulation

KW - Spin echo

KW - Spin qubit

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SN - 1386-9477

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SP - 251

EP - 256

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

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ER -

Preparing, manipulating, and measuring quantum states on a chip

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All Science Journal Classification (ASJC) codes

Keywords

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