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Flying electron spin control gates.

Paul L J Helgers1,2, James A H Stotz3,4, Haruki Sanada2

  • 1Paul-Drude-Institut für Festkörperelektronik, Leibniz-Institut im Forschungsverbund Berlin e.V., Hausvogteiplatz 5-7, 10117, Berlin, Germany.

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Summary
This summary is machine-generated.

We demonstrate dynamic control of moving electron spins using contactless gates. This breakthrough enables precise manipulation of quantum information for on-chip spin processing with a photonic interface.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Acoustoelectronics

Background:

  • Controlling mobile spin qubits is crucial for quantum information processing.
  • Existing methods use electric or magnetic fields for global or localized control.
  • Need for advanced techniques to manipulate spins during transport.

Purpose of the Study:

  • To demonstrate dynamic control of moving electron spins using contactless gates.
  • To explore the use of surface acoustic waves (SAWs) for spin manipulation.
  • To develop a key element for on-chip spin information processing with a photonic interface.

Main Methods:

  • Electron spins trapped and transported by moving potential dots generated by SAWs.
  • SAW strain used as a contactless, tunable gate to control spin precession.
  • Investigated spin-orbit interaction modulated by SAW-induced strain.

Main Results:

  • Achieved dynamic control of flying electron spins via SAW-induced strain.
  • Demonstrated an order of magnitude improvement in precession control compared to previous methods.
  • Developed a theoretical model accurately describing strain's effect on spin-orbit interaction.

Conclusions:

  • Contactless control of moving spins is feasible using SAW technology.
  • This method significantly enhances spin precession control during transport.
  • Enables the creation of acoustically driven optical polarization modulators for quantum computing.