Generalized limits for single-parameter quantum estimation

被引：310

作者：

Boixo, Sergio ^{[1
]}

Flammia, Steven T. ^{[1
]}

Caves, Carlton M. ^{[1
]}

Geremia, J. M. ^{[1
]}

机构：

[1] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 09期

关键词：

STATES;

D O I：

10.1103/PhysRevLett.98.090401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop generalized bounds for quantum single-parameter estimation problems for which the coupling to the parameter is described by intrinsic multisystem interactions. For a Hamiltonian with k-system parameter-sensitive terms, the quantum limit scales as 1/N-k, where N is the number of systems. These quantum limits remain valid when the Hamiltonian is augmented by any parameter-independent interaction among the systems and when adaptive measurements via parameter-independent coupling to ancillas are allowed.

引用

页数：4

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