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High-fidelity single-qubit gates for two-electron spin qubits in GaAs.

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Achieving high-fidelity quantum gates for singlet-triplet qubits in GaAs is crucial. This study theoretically demonstrates 99.9% fidelity quantum gates by minimizing decoherence and proposes a tuning protocol for experimental implementation.

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Area of Science:

  • Quantum computing
  • Solid-state quantum information

Background:

  • Single-qubit operations on singlet-triplet qubits in GaAs double quantum dots currently lack the fidelity for fault-tolerant quantum information processing.
  • Decoherence, particularly high-frequency 1/f-like noise, poses a significant challenge.

Purpose of the Study:

  • To theoretically demonstrate the achievability of high-fidelity quantum gates for singlet-triplet qubits.
  • To investigate methods for minimizing decoherence effects under experimentally relevant constraints.
  • To propose a protocol for experimental gate error elimination.

Main Methods:

  • Numerical minimization of decoherence effects using measured noise spectra.
  • Theoretical analysis of quantum gate performance in GaAs double quantum dots.
  • Development of a self-consistent tuning protocol.

Main Results:

  • Theoretical demonstration that quantum gates with fidelities exceeding 99.9% are achievable.
  • Effective minimization of decoherence, including 1/f-like noise, is shown to be possible.
  • A self-consistent tuning protocol is presented for eliminating systematic gate errors.

Conclusions:

  • High-fidelity single-qubit operations ( > 99.9%) are theoretically possible for singlet-triplet qubits in GaAs.
  • Minimizing decoherence using measured noise spectra is a viable strategy.
  • The proposed tuning protocol offers a pathway for experimental realization and error correction.