Ancilla-Assisted Calibration of a Measuring Apparatus

被引：41

作者：

Brida, G. ^{[1
]}

Ciavarella, L. ^{[1
]}

Degiovanni, I. P. ^{[1
]}

Genovese, M. ^{[1
]}

Migdall, A. ^{[2
,3
]}

Mingolla, M. G. ^{[1
,4
]}

Paris, M. G. A. ^{[1
,5
,6
]}

Piacentini, F. ^{[1
]}

Polyakov, S. V. ^{[2
,3
]}

机构：

[1] Ist Nazl Ric Metrol, I-10135 Turin, Italy

[2] Joint Quantum Inst, Gaithersburg, MD 20899 USA

[3] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[4] Politecn Torino, Dipartimento Fis, I-10129 Turin, Italy

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

[6] Consorzio Nazl Interuniv Sci Fis Mat, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 25期

关键词：

EXPERIMENTAL REALIZATION; PHOTON STATISTICS; DENSITY-MATRIX; QUANTUM STATE; TOMOGRAPHY; DETECTORS; LIGHT; BEAMS;

D O I：

10.1103/PhysRevLett.108.253601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A quantum measurement can be described by a set of matrices, one for each possible outcome, which represents the positive operator-valued measure (POVM) of the sensor. Efficient protocols of POVM extraction for arbitrary sensors are required. We present the first experimental POVM reconstruction that takes explicit advantage of a quantum resource, i.e., nonclassical correlations with an ancillary state. A POVM of a photon-number-resolving detector is reconstructed by using strong quantum correlations of twin beams generated by parametric down-conversion. Our reconstruction method is more statistically robust than POVM reconstruction methods that use classical input states.

引用

页数：5

共 37 条

[1] Quantum and classical correlations of intense beams of light investigated via joint photodetection [J].