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Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins.

Haifeng Qiao1, Yadav P Kandel1, Saeed Fallahi2,3

  • 1Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.

Physical Review Letters
|January 22, 2021
PubMed
Summary
This summary is machine-generated.

We demonstrate long-distance coupling between semiconductor quantum-dot spin qubits using a spin chain. This superexchange interaction overcomes connectivity challenges for scalable quantum computing.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Quantum Computing

Background:

  • Semiconductor quantum-dot spin qubits offer long coherence times and scalability for quantum information processing.
  • High connectivity between qubits is crucial for large-scale quantum computing but challenging for linear quantum-dot arrays.

Purpose of the Study:

  • To investigate long-distance coupling between electron spin qubits in semiconductor quantum dots.
  • To explore the potential of spin-chain-mediated superexchange for enhancing qubit connectivity.

Main Methods:

  • Weakly coupling two electron spins to the ends of a two-site spin chain.
  • Observing spin oscillations between distant end spins influenced by the chain's spin state.
  • Resolving the dynamics of both the end spins and the spin chain.

Main Results:

  • Evidence for long-distance spin-chain-mediated superexchange coupling between electron spin qubits.
  • Observed spin oscillations between distant spins, dependent on the spin chain's state.
  • Experimental measurements align with theoretical simulations, validating the observed dynamics.

Conclusions:

  • Superexchange coupling via a spin chain is a viable method for achieving long-distance interactions between quantum-dot spin qubits.
  • This technique addresses the connectivity challenge in scalable quantum computing architectures.
  • The findings pave the way for more complex and interconnected quantum systems.