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Related Experiment Videos

Selective spin coupling through a single exciton.

A Nazir1, B W Lovett, S D Barrett

  • 1Department of Materials, Oxford University, Oxford OX1 3PH, UK. ahsan.nazir@materials.oxford.ac.uk

Physical Review Letters
|November 5, 2004
PubMed
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We developed a new method for high-fidelity quantum computing using spin qubits in semiconductor quantum dots. This approach enables conditional phase gates and single-qubit rotations with existing technology.

Area of Science:

  • Quantum computing
  • Semiconductor physics
  • Quantum information science

Background:

  • Spin qubits in semiconductor quantum dots are promising for quantum computation.
  • Implementing controlled quantum gates is crucial for building quantum computers.
  • Förster interaction offers a pathway for qubit coupling.

Purpose of the Study:

  • To present a novel scheme for a conditional phase gate between two spin qubits.
  • To demonstrate the feasibility of high-fidelity single- and two-qubit gates using semiconductor technology.

Main Methods:

  • Utilizing delocalized single exciton states formed via interdot Förster interaction.
  • Considering two resonant quantum dots, each with a single excess conduction band electron spin qubit.
  • Leveraging current semiconductor and laser technology for gate implementation.

Related Experiment Videos

Main Results:

  • A novel scheme for a conditional phase gate between two spin qubits was successfully presented.
  • High-fidelity realization of both two-qubit gates and arbitrary single-qubit rotations is demonstrated.
  • The proposed method is compatible with existing semiconductor and laser technologies.

Conclusions:

  • The proposed scheme offers a viable route for high-fidelity quantum gate operations in semiconductor quantum dots.
  • This work contributes to the advancement of scalable quantum computing architectures.
  • The findings pave the way for practical implementation of quantum processors based on spin qubits.