Open quantum system description of singlet-triplet qubits in quantum dots

Autor(es)

Castelano, L. K. ; Fanchini, F. F. ; Berrada, K.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW B; v. 94, n. 23, p. 5-pg., 2016-12-23.

Resumo

We develop a theoretical model to describe the dissipative dynamics of singlet-triplet qubits in GaAs quantum dots. Using the concurrence experimentally obtained [Shulman et al., Science 336, 202 (2012)] as a guide, we assume that each logical qubit fluctuates under the action of a random telegraph noise (RTN) that simulates the 1/f(alpha) noise. We also study the dynamics of concurrence as a function of the amplitude of the RTN, the correlation time of the RTN, the preparation time of states, and the two-qubit coupling. Furthermore, we show that the two-qubit coupling together with the preparation time strongly affect the entanglement dissipative dynamics and both physical quantities can be employed to enhance the entanglement between singlet-triplet qubits. (AU)

• Processo FAPESP: 15/05581-7 - Controle quântico em sistemas dissipativos
• Beneficiário: Felipe Fernandes Fanchini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/13052-6 - Propriedades de transporte e computação quântica em nanoestruturas
• Beneficiário: Leonardo Kleber Castelano
• Modalidade de apoio: Auxílio à Pesquisa - Regular