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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/135367
Title: 
Protecting the √SWAP operation from general and residual errors by continuous dynamical decoupling
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Universidade Estadual de Campinas (UNICAMP)
ISSN: 
1050-2947
Sponsorship: 
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Instituto Nacional de Ciência e Tecnologia em Informação Quântica (INCT-IQ)
Sponsorship Process Number: 
  • FAPESP: 2012/50464-0
  • FAPESP: 2014/21792-5
Abstract: 
We study the occurrence of errors in a continuously decoupled two-qubit state during a √SWAP quantum operation under decoherence. We consider a realization of this quantum gate based on the Heisenberg exchange interaction, which alone suffices for achieving universal quantum computation. Furthermore, we introduce a continuous-dynamical-decoupling scheme that commutes with the Heisenberg Hamiltonian to protect it from the amplitude damping and dephasing errors caused by the system-environment interaction. We consider two error-protection settings. One protects the qubits from both amplitude damping and dephasing errors. The other features the amplitude damping as a residual error and protects the qubits from dephasing errors only. In both settings, we investigate the interaction of qubits with common and independent environments separately. We study how errors affect the entanglement and fidelity for different environmental spectral densities.
Issue Date: 
2015
Citation: 
Physical Review. A, v. 91, p. 1-8, 2015.
Time Duration: 
1-8
Publisher: 
American Physical Society
Source: 
http://dx.doi.org/10.1103/PhysRevA.91.042325
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/135367
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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