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A decoherence-free subspace in a charge quadrupole qubit.

Mark Friesen1, Joydip Ghosh1, M A Eriksson1

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

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|June 24, 2017
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Researchers developed a new quadrupole charge qubit to protect solid-state qubits from noise. This innovation significantly improves gate fidelities for quantum computing, overcoming current limitations in qubit coherence.

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Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Solid-State Physics

Background:

  • Semiconducting qubits are crucial for quantum computing, but charge noise limits their coherence during gate operations.
  • Overcoming electric field fluctuations is essential for robust quantum computation implementations.

Purpose of the Study:

  • To propose a novel scheme for protecting solid-state qubits from uniform electric field fluctuations.
  • To introduce a specific physical implementation: a quadrupole charge qubit in a triple quantum dot.

Main Methods:

  • Generalizing the concept of a decoherence-free subspace for spins.
  • Designing a quadrupole charge qubit utilizing Coulomb interactions within a triple quantum dot.
  • Developing a simple pulse sequence for noise suppression during gate operations.

Main Results:

  • Simulations show gate fidelities 10-1,000 times better than traditional charge qubits.
  • The quadrupole qubit design effectively suppresses the effects of environmental noise.
  • The proposed scheme offers enhanced coherence for quantum gate operations.

Conclusions:

  • The quadrupole charge qubit offers a promising solution to noise limitations in solid-state qubits.
  • This design can significantly improve the performance of quantum gates.
  • Future qubit schemes employing Coulomb interactions could benefit from this quadrupolar design for enhanced performance.