Online adaptive quantum characterization of a nuclear spin

Joas Timo; Schmitt Simon; Santagati Raffaele; Gentile Antonio Andrea; Bonato Cristian; Laing Anthony; McGuinness Liam P.; Jelezko Fedor

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Online adaptive quantum characterization of a nuclear spin

机译：核旋转的在线自适应量子特征

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The characterization of quantum systems is both a theoretical and technical challenge. Theoretical because of the exponentially increasing complexity with system size and the fragility of quantum states under observation. Technical because of the requirement to manipulate and read out individual atomic or photonic elements. Adaptive methods can help to overcome these challenges by optimizing the amount of information each measurement provides and reducing the necessary resources. Their implementation, however, requires fast-feedback and complex processing algorithms. Here, we implement online adaptive sensing with single spins and demonstrate close to photon shot noise limited performance with high repetition rate, including experimental overheads. We further use fast feedback to determine the hyperfine coupling of a nuclear spin to the nitrogen-vacancy sensor with a sensitivity of $$445,{mathrm{nT}}{sqrt{mathrm{Hz}}}^{- 1}$$ . Our experiment is a proof of concept that online adaptive techniques can be a versatile tool to enable faster characterization of the spin environment.

机译：量子系统的表征是理论和技术挑战。理论因子由于对系统尺寸和量子状态的脆弱性呈指数上增加的复杂性。技术原因是要求操纵和读出单个原子或光子元素。自适应方法可以通过优化每个测量提供和减少必要资源的信息量来帮助克服这些挑战。然而，它们的实现需要快速反馈和复杂的处理算法。在这里，我们用单旋转实施在线自适应感测，并逐步靠近光子射击噪声有限的性能，具有高重复率，包括实验开销。我们进一步使用快速反馈来确定核旋转到氮空位传感器的高血清耦合，具有$ 445 ，{ mathrm {nt}} { sqrt { mathrm {hz}} ^ {-1 $$。我们的实验是一个概念证明，即在线自适应技术可以是多功能工具，以实现旋转环境的更快表征。

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《Npj Quantum Information》 |2021年第1期|共8页
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Joas Timo; Schmitt Simon; Santagati Raffaele; Gentile Antonio Andrea; Bonato Cristian; Laing Anthony; McGuinness Liam P.; Jelezko Fedor;
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Online adaptive quantum characterization of a nuclear spin

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