三角踢挤压
Delta-kick Squeezing
摘要：
我们探索了在布拉格或拉曼散射光脉冲的两种相关情况下，使用玻色-爱因斯坦凝聚体（BEC）克服自由落体原子干涉仪中标准量子极限（SQL）的可能性。BEC中纠缠的产生通过外部陷阱的快速作用放大原子-原子相互作用而显着增强，该外部陷阱聚焦物质波以显着增加准备阶段的原子密度-我们称之为delta-kick压缩（DKS）的技术。在干涉测量序列结束时的第二DKS操作的动作允许实现非线性读出方案，使得子SQL灵敏度对不完美的原子计数检测高度鲁棒。我们预测超过30 dB的灵敏度增益超出SQL的方差，假设现实的参数和$10^6$原子。
英文摘要：
We explore the possibility to overcome the standard quantum limit (SQL) in a free-fall atom interferometer using a Bose-Einstein condensate (BEC) in either of the two relevant cases of Bragg or Raman scattering light pulses. The generation of entanglement in the BEC is dramatically enhanced by amplifying the atom-atom interactions via the rapid action of an external trap focusing the matter-waves to significantly increase the atomic densities during a preparation stage -- a technique we refer to as delta-kick squeezing (DKS). The action of a second DKS operation at the end of the interferometry sequence allows to implement a non-linear readout scheme making the sub-SQL sensitivity highly robust against imperfect atom counting detection. We predict more than 30 dB of sensitivity gain beyond the SQL for the variance, assuming realistic parameters and $10^6$ atoms.
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