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Fast spin exchange across a multielectron mediator.

Filip K Malinowski1, Frederico Martins1, Thomas B Smith2

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Researchers increased the range of fast, coherent spin qubit couplings using a multielectron quantum dot mediator. This advance enables scalable, voltage-controlled quantum gates for quantum processors.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics

Background:

  • Scalable quantum processors need tunable two-qubit gates that are fast, coherent, and long-range.
  • The Heisenberg exchange interaction provides fast, coherent coupling for spin qubits but is limited by its short range.

Purpose of the Study:

  • To demonstrate a method for extending the range of the Heisenberg exchange interaction.
  • To investigate the use of a multielectron quantum dot as a mediator for spin qubit coupling.

Main Methods:

  • A large multielectron quantum dot (50-100 electrons) was placed between two-electron double quantum dots.
  • Simultaneous operation and measurement of the double quantum dots were performed.
  • Two-spin correlations were analyzed to identify spin-exchange processes.

Main Results:

  • Coherent spin-exchange processes were observed across the multielectron quantum dot, effectively increasing the coupling range.
  • The mediated exchange interaction exhibited reduced susceptibility to charge noise at sweet spots.
  • Positive and negative coupling strengths up to several gigahertz were achieved.

Conclusions:

  • Multielectron quantum dots serve as effective mediators for long-range, coherent spin-spin coupling.
  • These mediated couplings are tunable and robust against charge noise.
  • Multielectron dots are promising scalable, voltage-controlled coupling elements for quantum computing architectures.