Feng X N, Zhang M, Wei L F
Information Quantum Technology Laboratory, International Cooperation Research Center of China Communication and Sensor Networks for Modern Transportation, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.
Phys Rev Lett. 2024 May 31;132(22):220801. doi: 10.1103/PhysRevLett.132.220801.
Quantum entanglement and quantum squeezing are two typical approaches to beat the standard quantum limit (SQL) for the sensitive phase estimations in quantum metrology. Each of them has already been utilized individually and sequentially to improve the sensitivity of electric field sensing with the trapped ion platform. However, the upper bound of the demonstrated sensitivity gain is still limited, i.e., the theoretical 6 dB and experimental 3 dB over the corresponding SQL, for electric field sensing. By simultaneously using the internal (spin)-external (oscillator) state entanglement and the oscillator squeezing to effectively amplify the accumulation phase, we show here that such a theoretical sensitivity gain upper bound can be significantly surpassed. The proposal provides a novel approach to implement the stronger beat of the SQL and even approach the Heisenberg limit, for the sensitive sensings of the desired electric field and also the other metrologies.
量子纠缠和量子压缩是量子计量学中用于敏感相位估计以突破标准量子极限（SQL）的两种典型方法。它们各自已被单独和相继用于提高基于囚禁离子平台的电场传感灵敏度。然而，已证明的灵敏度增益上限仍然有限，即对于电场传感，相对于相应的SQL在理论上为6分贝，实验上为3分贝。通过同时使用内部（自旋）-外部（振荡器）态纠缠和振荡器压缩来有效放大累积相位，我们在此表明，这样的理论灵敏度增益上限可以被显著超越。该提议为实现对SQL更强的突破甚至接近海森堡极限提供了一种新颖方法，可用于所需电场以及其他计量学的敏感传感。
