Resonant direct cnot in remote double quantum dot spin qubits

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2023
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A critical element towards the realization of scalable quantum processors is nonlocal coupling between nodes. Scaling connectivity beyond nearest-neighbor interactions requires the implementation of a mediating interaction often termed a quantum bus. Cavity photons have long been used as a bus by the superconducting qubit community, but it has only recently been demonstrated that spin-based qubits in double quantum dot architectures can reach the strong coupling regime and exhibit spin-spin interactions via the exchange of real or virtual photons. Two-qubit gate operations are predicted in the dispersive regime where cavity loss plays a less prominent role. In this work we combine a cross-resonance entangling drive with simultaneous local rotations to propose a framework for a resonant direct-cnot operation, between two nonlocal single-spin qubits dispersively coupled to a common mode of a superconducting resonator. We expect gate times near 100 ns and fidelities above 90% with existing technology.

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ISO 690MCMILLAN, Stephen, Guido BURKARD, 2023. Resonant direct cnot in remote double quantum dot spin qubits. In: Physical Review B. American Physical Society (APS). 2023, 108(12), 125414. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/physrevb.108.125414
BibTex
@article{McMillan2023Reson-68034,
  year={2023},
  doi={10.1103/physrevb.108.125414},
  title={Resonant direct cnot in remote double quantum dot spin qubits},
  number={12},
  volume={108},
  issn={2469-9950},
  journal={Physical Review B},
  author={McMillan, Stephen and Burkard, Guido},
  note={Article Number: 125414}
}
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