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Coherent Spin-State Transfer via Heisenberg Exchange

ORAL

Abstract

Spin qubits in semiconductors are a promising scalable architecture for quantum computing. Long chains of spin qubits have already been realized in different semiconductor platforms but transferring quantum information throughout such chains is still a challenge. Here we present the first experimental demonstration of the coherent transfer of electron spin states back and forth across a chain of four quantum-dot spin qubits using Heisenberg exchange coupling between neighboring electrons, which arises from the overlap of their wavefunctions. We swap the spin states of a pair of electrons via precisely-controlled exchange pulses. Successive SWAP operations between different pairs can transfer a quantum spin state to a distant qubit, without moving any electrons. Because this method is scalable to long chains of spin qubits, coherent spin -state transfer using Heisenberg exchange will be useful in multi qubit operations, measurement-based entanglement swapping and gate teleportation, and error correction in spin-based quantum computers.

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Presenters

  • Yadav Kandel

    University of Rochester

Authors

  • Yadav Kandel

    University of Rochester

  • Haifeng Qiao

    University of Rochester

  • Saeed Fallahi

    Physics and Astronomy, Purdue University, Purdue University, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • Geoffrey C. Gardner

    Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, Microsoft Quantum at Station Q Purdue, Materials Engineering, Purdue University, Purdue University, Microsoft Quantum at Station Q Purdue, Purdue University

  • Michael Manfra

    Physics and Astronomy, Purdue Univ, Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, School of Materials Engineering, School of Electrical and Computer Engineering, Purdue, Purdue Univ, Purdue University, Microsoft Quantum at Station Q Purdue, Department of Physics and Astronomy, Birck Nanotechnology Center, Microsoft Quantum Purdue, School og Materials Engineering & School of Electrical and Computer Engineering, P, Physics and Astronomy, Purdue University, Department of Physics and Astronomy and Station Q Purdue, Purdue University, Department of Physics and Astronomy and Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA, Department of Physics and Astronomy, PURDUE UNIVERSITY, Department of Physics and Astronomy, Microsoft Quantum Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA, Physics, Purdue University

  • John Nichol

    University of Rochester