Motional Dynamical Decoupling for Interferometry with Macroscopic Particles.,Physical Review Letters

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Motional Dynamical Decoupling for Interferometry with Macroscopic Particles.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-09 , DOI: 10.1103/physrevlett.125.023602
Julen S Pedernales ₁ , Gavin W Morley ₂ , Martin B Plenio ₁

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We extend the concept of dynamical decoupling from spin to mechanical degrees of freedom of macroscopic objects, for application in interferometry. In this manner, the superposition of matter waves can be made resilient to many important sources of noise when these are driven along suitable paths in space. As a concrete implementation, we present the case of levitated (or free falling) nanodiamonds hosting a color center in a magnetic field gradient. We point out that these interferometers are inherently affected by diamagnetic forces, which restrict the separation of the superposed states to distances that scale with the inverse of the magnetic field gradient. Periodic forcing of the mechanical degree of freedom is shown to overcome this limitation, achieving a linear-in-time growth of the separation distance independent of the magnetic field gradient, while simultaneously protecting the coherence of the superposition from environmental perturbations.

中文翻译：

宏观粒子干涉测量的动态耦合。

我们将动态去耦的概念从自旋扩展到了宏观物体的机械自由度，以用于干涉测量。以这种方式，当沿着空间中的适当路径驱动许多重要的噪声源时，可以使它们的叠加具有弹性。作为具体的实现，我们介绍了悬浮（或自由下落）纳米金刚石在磁场梯度中具有色心的情况。我们指出，这些干涉仪固有地受到抗磁力的影响，这将叠加状态的分离限制在与磁场梯度成反比的距离范围内。周期性地强迫机械自由度可以克服这一限制，

更新日期：2020-07-09

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