Protecting the root SWAP operation from general and residual errors by continuous dynamical decoupling

Autor(es)

Fanchini, F. F. ^[1] ; Napolitano, R. D. J. ^[2] ; Cakmak, B. ^[3] ; Caldeira, A. O. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Fac Ciencias, BR-17033360 Bauru, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review A; v. 91, n. 4 APR 22 2015.
• Citações Web of Science: 4

Resumo

We study the occurrence of errors in a continuously decoupled two-qubit state during a root 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. (AU)

• Processo FAPESP: 14/21792-5 - Proteção de algoritmos quânticos e portas lógicas em sistemas quânticos abertos
• Beneficiário: Baris Cakmak
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/50464-0 - Estudo das correlações quânticas em sistemas quânticos abertos
• Beneficiário: Felipe Fernandes Fanchini
• Modalidade de apoio: Auxílio à Pesquisa - Regular