Araujo-Ferreira, Arthur G.
Andreeta, Jose P.
Bonagamba, Tito J.
Total Authors: 6
 Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, Caixa Postal 153, BR-13600970 Araras, SP - Brazil
 Univ Estadual Ponta Grossa, Dept Fis, Av Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, PR - Brazil
 Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
QUANTUM INFORMATION PROCESSING;
Web of Science Citations:
Recently, we reported an experimental implementation of quantum information processing (QIP) by nuclear quadrupole resonance (NQR). In this work, we present the first quantum state tomography (QST) experimental implementation in the NQR QIP context. Two approaches are proposed, employing coherence selection by temporal and spatial averaging. Conditions for reduction in the number of cycling steps are analyzed, which can be helpful for larger spin systems. The QST method was applied to the study of spin coherent states, where the alignment-to-orientation phenomenon and the evolution of squeezed spin states show the effect of the nonlinear quadrupole interaction intrinsic to the NQR system. The quantum operations were implemented using a single-crystal sample of KCIO3 and observing (CI)-C-35 nuclei, which posses spin 3/2. (AU)