Generating Long-Lived Macroscopically Distinct Superposition States in Atomic Ensembles
Generating Long-Lived Macroscopically Distinct Superposition States in Atomic Ensembles
复制标题
在原子系综中生成长期存在的宏观上不同的叠加态
DOI：
10.1103/physrevlett.127.093602
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发表时间：
2021
影响因子：
8.6
通讯作者：
Nori Franco
中科院分区：
文献类型：
--
作者：
Qin Wei;Miranowicz Adam;Jing Hui;Nori Franco
我们提出了在原子系综中建立和稳定长寿命宏观量子叠加态的方法。我们表明，使用全量子参量放大器可以导致两个原子的同时衰变，反过来，创建稳定的原子薛定谔猫态。值得注意的是，即使在适当的参数下，这些腔内原子猫态也可以具有极长的寿命，比相同参数条件下的腔内光子猫态的寿命长4个数量级，达到几十毫秒。由于极弱的自旋弛豫和热噪声，原子猫态的寿命最终被限制在几秒之内。我们的工作为实现产生大尺寸和长寿命猫态的长期目标开辟了一条新途径，在基础研究和抗噪声量子技术方面都具有直接利益。
We propose to create and stabilize long-lived macroscopic quantum superposition states in atomic ensembles. We show that using a fully quantum parametric amplifier can cause the simultaneous decay of two atoms and, in turn, create stabilized atomic Schrödinger cat states. Remarkably, even with modest parameters these intracavity atomic cat states can have an extremely long lifetime, up to4 orders of magnitudelonger than that of intracavity photonic cat states under the same parameter conditions, reachingtens of milliseconds. This lifetime of atomic cat states is ultimately limited toseveral secondsby extremely weak spin relaxation and thermal noise. Our work opens up a new way toward the long-standing goal of generating large-size and long-lived cat states, with immediate interests both in fundamental studies and noise-immune quantum technologies.