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We demonstrate a new method for controlling single electrons in quantum dots using gate voltages. This technique allows for precise manipulation of electron spin (pseudospin) for quantum computing applications.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Quantum information science

Background:

  • Quantum dots are semiconductor nanostructures that confine electrons.
  • Controlling electron spin is crucial for quantum computing.
  • Existing methods often require complex magnetic fields or spin-orbit coupling.

Purpose of the Study:

  • To define and manipulate an effective two-level (qubit) system using a single electron in a quantum dot.
  • To explore coherent manipulation without external time-dependent magnetic fields or spin-orbit coupling.
  • To assess the feasibility of single-qubit rotations and controlled-NOT operations.

Main Methods:

  • Utilizing a static slanting Zeeman field in a 1D quantum dot.
  • Combining electron spin and orbital degrees of freedom to define a pseudospin qubit.
  • Applying voltage to gate electrodes for coherent manipulation.

Main Results:

  • An effective pseudospin qubit system was successfully defined.
  • Coherent manipulation was achieved using gate voltages alone.
  • Single-qubit rotations and controlled-NOT operations were demonstrated.
  • Relaxation (T1) and coherence (T2) times were estimated, along with a tunable quality factor.

Conclusions:

  • This scheme offers significant experimental advantages for single electron spin control.
  • The proposed method provides a viable pathway for building quantum processors.
  • Coherent manipulation of pseudospin qubits in quantum dots is achievable with high fidelity.