Priority choice experimental two-qubit tomography: measuring one by one all elements of density matrices

0463819 - FZÚ 2017 RIV GB eng J - Journal Article
Bartkiewicz, K. - Černoch, Antonín - Lemr, K. - Miranowicz, A.
Priority choice experimental two-qubit tomography: measuring one by one all elements of density matrices.
Scientific Reports. Roč. 6, Jan (2016), 1-7, č. článku 19610. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR GAP205/12/0382
Institutional support: RVO:68378271
Keywords : entangled photons * state tomography
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 4.259, year: 2016

In standard optical tomographic methods, the off-diagonal elements of a density matrix. are measured indirectly. Thus, the reconstruction of., even if it is based on linear inversion, typically magnifies small errors in the experimental data. Recently, an optimal tomography solution measuring all the elements of. one-by-one without error magnification has been theoretically proposed. We implemented this method for two-qubit polarization states. For comparison, we also experimentally implemented other well-known tomographic protocols, either based solely on local measurements (of, e.g., the Pauli operators and James-Kwiat-Munro-White projectors) or with mutually unbiased bases requiring both local and global measurements. We reconstructed seventeen separable, partially and maximally entangled two-qubit polarization states.
Permanent Link: http://hdl.handle.net/11104/0262919