Controllable anisotropic exchange coupling between spin qubits in quantum dots

Yun Pil Shim, Sangchul Oh, Xuedong Hu, Mark Friesen

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate maximally entangled Greenberger-Horne-Zeilinger states or universal gate sets for exchange-only quantum computing. We exploit the XXZ couplings to propose a qubit scheme, based on double dots.

Original languageEnglish
Article number180503
JournalPhysical Review Letters
Volume106
Issue number18
DOIs
Publication statusPublished - 6 May 2011
Externally publishedYes

Fingerprint

Quantum Dots
Motor Vehicles
Magnetic Fields
quantum dots
quantum computation
broken symmetry
interactions
geometry
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Controllable anisotropic exchange coupling between spin qubits in quantum dots. / Shim, Yun Pil; Oh, Sangchul; Hu, Xuedong; Friesen, Mark.

In: Physical Review Letters, Vol. 106, No. 18, 180503, 06.05.2011.

Research output: Contribution to journalArticle

Shim, Yun Pil ; Oh, Sangchul ; Hu, Xuedong ; Friesen, Mark. / Controllable anisotropic exchange coupling between spin qubits in quantum dots. In: Physical Review Letters. 2011 ; Vol. 106, No. 18.
@article{80c7b96b75884f23acff6016d17db43a,
title = "Controllable anisotropic exchange coupling between spin qubits in quantum dots",
abstract = "The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate maximally entangled Greenberger-Horne-Zeilinger states or universal gate sets for exchange-only quantum computing. We exploit the XXZ couplings to propose a qubit scheme, based on double dots.",
author = "Shim, {Yun Pil} and Sangchul Oh and Xuedong Hu and Mark Friesen",
year = "2011",
month = "5",
day = "6",
doi = "10.1103/PhysRevLett.106.180503",
language = "English",
volume = "106",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",

}

TY - JOUR

T1 - Controllable anisotropic exchange coupling between spin qubits in quantum dots

AU - Shim, Yun Pil

AU - Oh, Sangchul

AU - Hu, Xuedong

AU - Friesen, Mark

PY - 2011/5/6

Y1 - 2011/5/6

N2 - The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate maximally entangled Greenberger-Horne-Zeilinger states or universal gate sets for exchange-only quantum computing. We exploit the XXZ couplings to propose a qubit scheme, based on double dots.

AB - The exchange coupling between quantum dot spin qubits is isotropic, which restricts the types of quantum gates that can be formed. Here, we propose a method for controlling anisotropic interactions between spins arranged in a bus geometry. The symmetry is broken by an external magnetic field, resulting in XXZ-type interactions that can efficiently generate maximally entangled Greenberger-Horne-Zeilinger states or universal gate sets for exchange-only quantum computing. We exploit the XXZ couplings to propose a qubit scheme, based on double dots.

UR - http://www.scopus.com/inward/record.url?scp=79960624827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79960624827&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.106.180503

DO - 10.1103/PhysRevLett.106.180503

M3 - Article

AN - SCOPUS:79960624827

VL - 106

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 18

M1 - 180503

ER -