Scientific Results

Variational quantum process tomography of two-qubit maps

Year: 2013

Authors: Vianna R.O., Crespi A., Ramponi R., Osellame R., Sansoni L., Milani G., Mataloni P., Sciarrino F.

Autors Affiliation: Departamento de Fısica-ICEx-Universidade Federal de Minas Gerais, Avenida Presidente Antonio Carlos 6627,Belo Horizonte, Minas Gerais 31270-901, Brazil; Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche (IFN-CNR), Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy; Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci, 32, I-20133 Milano, Italy; Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro, 5, I-00185 Roma, Italy; Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (INO-CNR), Largo Enrico Fermi, 6, I-50125 Firenze, Italy

Abstract: Full characterization of quantum states and processes is a fundamental requirement for verification andbenchmarking of quantum devices. It has been realized in systems with few components, but for larger systems it becomes unfeasible because of the exponential growing with the system size of the number of measurements and the amount of computational power required to process them. A new approach for quantum state tomography and quantum process tomography, requiring a limited number of measurements, has been recently introduced by Maciel et al.[Quantum Inf. Comput. 12, 0442 (2012);Int. J. Mod. Phys. C22, 1361 (2011).], namely variational quantum-process tomography (VQT). Here we adopt the VQT approach for the experimental characterization of two-qubit quantum processes and compare the reconstructed maps with those obtained by standard tomographic methods. The results demonstrate the high performance of this approach and propose VQT as a powerful alternative to the standard quantum process tomography.


Volume: 87 (3)      Pages from: 032304  to: 032304

More Information: We acknowledge financial support from the Brazilian CNR-CNPq cooperation project, FAPEMIG, and INCT-IQ (National Institute of Science and Technology for Quantum Information) and from EU-Project CHISTERA-QUASAR, FIRB-Futuro in Ricerca HYTEQ, PRIN 2009, and ERC-Starting Grant 3D-QUEST (3D-Quantum Integrated Optical Simulation).
DOI: 10.1103/PhysRevA.87.032304

Citations: 2
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