Ancilla-Assisted Calibration of a Measuring Apparatus
Quantum Physics
2015-06-05 v2
Abstract
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.
Keywords
Cite
@article{arxiv.1205.0798,
title = {Ancilla-Assisted Calibration of a Measuring Apparatus},
author = {G. Brida and L. Ciavarella and I. P. Degiovanni and M. Genovese and A. Migdall and M. G. Mingolla and M. G. A. Paris and F. Piacentini and S. V. Polyakov},
journal= {arXiv preprint arXiv:1205.0798},
year = {2015}
}
Comments
5 pages, 4 figures, close to published version