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Protection of quantum algorithms and logic gates in open quantum systems

Grant number: 14/21792-5
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): April 01, 2015
Effective date (End): October 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics
Acordo de Cooperação: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Amir Ordacgi Caldeira
Grantee:Baris Cakmak
Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil


Throughout this research project, our main goal is to study and develop strategies to protect different quantum gates through the dynamic decoupling techniques. One of the topics of this project is based on more realistic models, where the relative distance of qubits can vary during the quantum gate. In this case, we will focus our attention on time-dependent interaction Hamiltonians where the interaction with the environment behaves independently, when the qubits are separated, and collectively, when they are close. In this sense, our goal is to determine the efficiency of the protective method through the fidelity, entanglement and quantum correlations dynamics, considering the relative positions of the qubits. In addition, we will expand our protective method to include physical systems with additional energy levels, as qutrits and ququarts. In this case we intend to study the dissipative dynamics of one of the simplest quantum algorithms, recently introduced by Zafer Gedik, besides presenting a protective method through the dynamic decoupling technique. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MALVEZZI, A. L.; KARPAT, G.; CAKMAK, B.; FANCHINI, F. F.; DEBARBA, T.; VIANNA, R. O.. Quantum correlations and coherence in spin-1 Heisenberg chains. PHYSICAL REVIEW B, v. 93, n. 18, p. 8-pg., . (08/57856-6, 14/21792-5, 14/20941-7, 12/18558-5, 15/05581-7)
FANCHINI, F. F.; NAPOLITANO, R. D. J.; CAKMAK, B.; CALDEIRA, A. O.. Protecting the root SWAP operation from general and residual errors by continuous dynamical decoupling. Physical Review A, v. 91, n. 4, . (14/21792-5, 12/50464-0)
MALVEZZI, A. L.; KARPAT, G.; CAKMAK, B.; FANCHINI, F. F.; DEBARBA, T.; VIANNA, R. O.. Quantum correlations and coherence in spin-1 Heisenberg chains. Physical Review B, v. 93, n. 18, . (15/05581-7, 12/18558-5, 14/20941-7, 14/21792-5, 08/57856-6)
GEDIK, Z.; SILVA, I. A.; CAKMAK, B.; KARPAT, G.; VIDOTO, E. L. G.; SOARES-PINTO, D. O.; DEAZEVEDO, E. R.; FANCHINI, F. F.. Computational speed-up with a single qudit. SCIENTIFIC REPORTS, v. 5, . (14/20941-7, 14/21792-5, 12/50464-0)

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