Scholarlink

<p>Recent experiments demonstrated that the spin state of individual atoms on surfaces can be quantum-coherently controlled through all-electric electron spin resonance. By constructing interacting arrays of atoms, this results in an atomic-scale qubit platform. However, the static exchange coupling between qubits, limited lifetime, and polarization of the initial state impose significant limits on high-fidelity quantum control. We address this issue using open quantum systems simulation and quantum optimal control theory. We demonstrate the conditions under which high-fidelity operations (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\mathcal{F}}\,\gtrsim\, 0.9\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi class="MJX-tex-caligraphic" mathvariant="script">F</mi> <mspace width="0.25em" /> <mo>≳</mo> <mspace width="0.25em" /> <mn>0.9</mn> </mrow> </math></EquationSource> </InlineEquation>) are feasible in this qubit platform, and show how the Krotov method of quantum optimal control theory adapts to specific noise sources to outperform the conventional Rabi drivings. Finally, we re-examine the experimental setup used in the initial demonstration of this qubit platform and propose optimized experimental designs to maximize gate fidelity in this platform.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Overcoming limitations on gate fidelity in noisy static exchange-coupled surface qubits

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年3月7日

查看全文
  • Hoang-Anh Le,
  • Saba Taherpour,
  • Denis Janković,
  • Christoph Wolf

摘要

Recent experiments demonstrated that the spin state of individual atoms on surfaces can be quantum-coherently controlled through all-electric electron spin resonance. By constructing interacting arrays of atoms, this results in an atomic-scale qubit platform. However, the static exchange coupling between qubits, limited lifetime, and polarization of the initial state impose significant limits on high-fidelity quantum control. We address this issue using open quantum systems simulation and quantum optimal control theory. We demonstrate the conditions under which high-fidelity operations ( \({\mathcal{F}}\,\gtrsim\, 0.9\) F ≳ 0.9 ) are feasible in this qubit platform, and show how the Krotov method of quantum optimal control theory adapts to specific noise sources to outperform the conventional Rabi drivings. Finally, we re-examine the experimental setup used in the initial demonstration of this qubit platform and propose optimized experimental designs to maximize gate fidelity in this platform.