OPTIMAL QUANTUM MEASUREMENTS FOR PHASE ESTIMATION

被引:203
作者
SANDERS, BC [1 ]
MILBURN, GJ [1 ]
机构
[1] UNIV NEW MEXICO,CTR ADV STUDIES,ALBUQUERQUE,NM 87131
关键词
D O I
10.1103/PhysRevLett.75.2944
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Quantum information theory is applied to practical interferometer-based phase measurements to deduce the optimal phase measurement scheme with two optical modes. Optimal phase measurements, given ideal input states, reveal an asymptotic 1/n decrease in phase uncertainty Delta theta for n the mean photon number of the input state. In contradistinction to previous schemes for realizing the number-phase uncertainty limit, the 1/n limit achieved here is independent of the interferometer phase shift; prior information about the expected phase shift is not necessary to attain this limit. These results apply more generally to su(2) and so(3) phase parameter estimation.
引用
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页码:2944 / 2947
页数:4
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