Iterative phase estimation

被引：13

作者：

O'Loan, C. J. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Math & Stat, St Andrews KY16 9SS, Fife, Scotland

来源：

JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL | 2010年 / 43卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

QUANTUM; ENTANGLEMENT; GEOMETRY; CHANNELS;

D O I：

10.1088/1751-8113/43/1/015301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We give an iterative algorithm for phase estimation of a parameter., which is within a logarithmic factor of the Heisenberg limit. Unlike other methods, we do not need any entanglement or an extra rotation gate which can perform arbitrary rotations with almost perfect accuracy: only a single copy of the unitary channel and basic measurements are needed. Simulations show that the algorithm is successful. We also look at iterative phase estimation when depolarizing noise is present. It is seen that the algorithm is still successful provided the number of iterative stages is below a certain threshold.

引用

页数：15

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