Experimental estimation of one-parameter qubit gates in the presence of phase diffusion

被引：75

作者：

Brivio, Davide ^{[1
,2
]}

Cialdi, Simone ^{[1
,2
]}

Vezzoli, Stefano ^{[1
,2
]}

Gebrehiwot, Berihu Teklu ^{[1
,3
]}

Genoni, Marco G. ^{[1
,3
]}

Olivares, Stefano ^{[1
,3
]}

Paris, Matteo G. A. ^{[1
,3
,4
]}

机构：

[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[2] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[3] Univ Milan, CNISM UdR, I-20133 Milan, Italy

[4] ISI Fdn, I-10133 Turin, Italy

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 01期

关键词：

QUANTUM ESTIMATION; OBSERVABLES; DISTANCE;

D O I：

10.1103/PhysRevA.81.012305

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We address estimation of one-parameter qubit gates in the presence of phase diffusion. We evaluate the ultimate quantum limits to precision, seek optimal probes and measurements, and demonstrate an optimal estimation scheme for polarization encoded optical qubits. An adaptive method to achieve optimal estimation in any working regime is also analyzed in detail and experimentally implemented.

引用

页数：7

共 35 条

[1]

[Anonymous], 2004, LECT NOTES PHYS

[2] Maximum-likelihood estimation of the density matrix [J].