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Long distance coupling of resonant exchange qubits

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2015

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https://doi.org/10.1103/PhysRevB.92.205412
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Physical Review B. 2015, 92(20), 205412. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.92.205412

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We investigate the effectiveness of a microwave cavity as a mediator of interactions between two resonant exchange (RX) qubits in semiconductor quantum dots (QDs) over long distances, limited only by the extension of the cavity. Our interaction model includes the orthonormalized Wannier orbitals constructed from Fock-Darwin states under the assumption of a harmonic QD confinement potential. We calculate the qubit-cavity coupling strength in a Jaynes-Cummings Hamiltonian and find that dipole transitions between two states with an asymmetric charge configuration constitute the relevant RX qubit-cavity coupling mechanism. The effective coupling between two RX qubits in a shared cavity yields a universal two-qubit iswap gate with gate times on the order of nanoseconds over distances on the order of up to a millimeter.

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ISO 690RUSS, Maximilian, Guido BURKARD, 2015. Long distance coupling of resonant exchange qubits. In: Physical Review B. 2015, 92(20), 205412. ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.92.205412
BibTex
@article{Russ2015-11-09dista-32318,
  year={2015},
  doi={10.1103/PhysRevB.92.205412},
  title={Long distance coupling of resonant exchange qubits},
  number={20},
  volume={92},
  issn={1098-0121},
  journal={Physical Review B},
  author={Russ, Maximilian and Burkard, Guido},
  note={Article Number: 205412}
}
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