Enhancing the Precision of Phase Estimation by Weak Measurement and Quantum Measurement Reversal in High Dimensional Quantum System
- 44 Downloads
We investigate the effect of the weak measurement (WM) and quantum measurement reversal (QMR) on the improvement of the parameter-estimation precision for a qurit interacting with a zero-temperature reservoir with both spontaneous emission and dephasing. We derive the exact expressions of the optimal quantum Fisher information (QFI), show explicitly that the WM and QMR operation indeed helps for enhancing the precision of parameter estimation from spontaneous emission damping, but not for dephasing damping. In particular, we found that the enhancement effect is work in high dimensional quantum system, which extends the applicable scope of the WM and QMR approach.
KeywordsThe precision of parameter estimation Weak measurement and quantum measurement reversal Spontaneous emission and dephasing
This work is financially supported by the National Natural Science Foundation of China (Grants No. 61605019 and No. 61505053), the China Postdoctoral Science Foundation (Grant No. 2017M622582).