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Quantum control in dissipative systems

Grant number: 15/05581-7
Support type:Regular Research Grants
Duration: August 01, 2015 - July 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Physics
Principal Investigator:Felipe Fernandes Fanchini
Grantee:Felipe Fernandes Fanchini
Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil


In this research project we will study the dynamics of important quantum properties, such as fidelity, quantum correlations, entanglement, and non-Markovianity in open quantum systems. Our main objective is to develop efficient and realistic strategies to protect quantum information and operations against the harmful effects of the environment.We will study protective strategies based on (i) dynamic decoupling and (ii) quantum optimal control theory. We will determine and compare the efficiency of these two different control methods and, in addition, to concatenate them in order to increase the protective efficiency.Two particular cases will be studied. First we will study physical systems where the relative distance of the qubits can vary over time. In this case, we will focus our attention on time dependent interaction Hamiltonian since that the interaction with the environment behaves independently, when the qubits are separated, and collectively, when they are close. Finally, we will include physical systems with more energy levels as qutrits and ququarts. In this case we will study the dissipative dynamics and control of one of the simplest quantum algorithms recently introduced by Zafer Gedik. (AU)

Matéria(s) publicada(s) na Agência FAPESP sobre o auxílio:
Quantum algorithm shown to be more efficient than any classical equivalent 

Scientific publications (6)
(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)
RIVERA-RUIZ, C. M.; DE LIMA, E. F.; FANCHINI, F. F.; LOPEZ-RICHARD, V.; CASTELANO, L. K. Optimal control of hybrid qubits: Implementing the quantum permutation algorithm. Physical Review A, v. 97, n. 3 MAR 21 2018. Web of Science Citations: 1.
DEBARBA, TIAGO; FANCHINI, FELIPE F. Non-Markovianity quantifier of an arbitrary quantum process. Physical Review A, v. 96, n. 6 DEC 12 2017. Web of Science Citations: 2.
CASTELANO, L. K.; FANCHINI, F. F.; BERRADA, K. Open quantum system description of singlet-triplet qubits in quantum dots. Physical Review B, v. 94, n. 23 DEC 23 2016. Web of Science Citations: 5.
LIU, BI-HENG; HU, XIAO-MIN; CHEN, JIANG-SHAN; ZHANG, CHAO; HUANG, YUN-FENG; LI, CHUAN-FENG; GUO, GUANG-CAN; KARPAT, GOKTUG; FANCHINI, FELIPE F.; PIILO, JYRKI; MANISCALCO, SABRINA. Time-invariant entanglement and sudden death of nonlocality. Physical Review A, v. 94, n. 6 DEC 9 2016. Web of Science Citations: 7.
NETO, ALAOR CERVATI; KARPAT, GOKTUG; FANCHINI, FELIPE FERNANDES. Inequivalence of correlation-based measures of non-Markovianity. Physical Review A, v. 94, n. 3 SEP 6 2016. Web of Science Citations: 8.
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 MAY 24 2016. Web of Science Citations: 38.

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