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
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.
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页数:5
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