Strong spin squeezing induced by weak squeezing of light inside a cavity
Strong spin squeezing induced by weak squeezing of light inside a cavity
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DOI：
10.1515/nanoph-2020-0513
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发表时间：
2019-12
期刊：
影响因子：
7.5
通讯作者：
W. Qin;Ye‐Hong Chen;Xin Wang;A. Miranowicz;F. Nori
中科院分区：
文献类型：
--
作者：
W. Qin;Ye‐Hong Chen;Xin Wang;A. Miranowicz;F. Nori
摘要：我们提出了一种简单的方法，用于在弱失谐双光子驱动的 Floquet 腔中产生原子系综的自旋挤压。我们证明，与直觉相反，腔内光的微弱挤压会引起强烈的自旋挤压。这是通过利用光子对与原子相互作用的反斯托克斯散射过程来实现的。具体来说，光子对中的一个光子通过部分吸收另一个光子的能量而被散射到腔谐振中，该另一个光子的剩余能量激发原子。散射与 Floquet 边带相结合，提供了实现海森堡有限自旋压缩的替代机制。我们的方案不需要对系综中的原子应用多个经典和腔光子驱动，因此与其他基于腔的方案相比，其实验可行性大大提高。作为一个例子，我们展示了一种将超导谐振器与氮空位电子自旋系综耦合的可能实现方式。
Abstract We propose a simple method for generating spin squeezing of atomic ensembles in a Floquet cavity subject to a weak, detuned two-photon driving. We demonstrate that the weak squeezing of light inside the cavity can, counterintuitively, induce strong spin squeezing. This is achieved by exploiting the anti-Stokes scattering process of a photon pair interacting with an atom. Specifically, one photon of the photon pair is scattered into the cavity resonance by absorbing partially the energy of the other photon whose remaining energy excites the atom. The scattering, combined with a Floquet sideband, provides an alternative mechanism to implement Heisenberg-limited spin squeezing. Our proposal does not need multiple classical and cavity-photon drivings applied to atoms in ensembles, and therefore its experimental feasibility is greatly improved compared to other cavity-based schemes. As an example, we demonstrate a possible implementation with a superconducting resonator coupled to a nitrogen-vacancy electronic-spin ensemble.