Deterministic entanglement generation from driving through quantum phase transitions
Deterministic entanglement generation from driving through quantum phase transitions
复制标题
通过量子相变驱动产生确定性纠缠
DOI：
10.1126/science.aag1106
复制
发表时间：
2017-02-10
期刊：
影响因子：
56.9
通讯作者：
You, Li
中科院分区：
文献类型：
--
作者：
Luo, Xin-Yu;Zou, Yi-Quan;You, Li
多体纠缠通常是通过系统的演化产生的，并借助于组成粒子之间的非线性相互作用。然而，如果相互作用无法控制，这些动力学也会导致纠缠的波动和退化。在这里，我们证明了近确定性的纠缠双福克凝聚体的产生类似于11,000个原子驱动铷-87玻色-爱因斯坦凝聚体进行自旋混合通过两个连续的量子相变（QPT）。我们直接观察到10.7 +/- 0.6分贝的数压缩和0.99 +/- 0.01的归一化集体自旋长度。总之，这些观察使我们能够推断出纠缠增强的相位灵敏度接近标准量子极限6分贝，纠缠宽度接近910个原子。我们的工作突出了利用QPT分离的不同纠缠景观产生大规模有用纠缠的力量。
Many-body entanglement is often created through the system evolution, aided by nonlinear interactions between the constituting particles. These very dynamics, however, can also lead to fluctuations and degradation of the entanglement if the interactions cannot be controlled. Here, we demonstrate near-deterministic generation of an entangled twin-Fock condensate of similar to 11,000 atoms by driving a rubidium-87 Bose-Einstein condensate undergoing spin mixing through two consecutive quantum phase transitions (QPTs). We directly observe number squeezing of 10.7 +/- 0.6 decibels and normalized collective spin length of 0.99 +/- 0.01. Together, these observations allow us to infer an entanglement-enhanced phase sensitivity of similar to 6 decibels beyond the standard quantum limit and an entanglement breadth of similar to 910 atoms. Our work highlights the power of generating large-scale useful entanglement by taking advantage of the different entanglement landscapes separated by QPTs.