Quantum memory and cavity electrodynamics in quantum dots coupled by tunneling

• Grant number: 14/12740-1
• Support type: Scholarships in Brazil - Post-Doctorate
• Effective date (Start): November 01, 2014
• Effective date (End): January 15, 2018
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal researcher: Celso Jorge Villas-Bôas
• Grantee: Halyne Silva Borges
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

This project concentrates in the theoretical study of a system constituted by a double semiconductor quantum dots coupled by tunneling inside a high finesse optical cavity. This system is a promising candidate for applications in quantum memories based on slow light effect. Double quantum dots also called, quantum dots molecule have a great flexibility and experimental ability to change both their energy spectrum and their structural geometry through of external electric fields. In this way, the coherent optical control of charge carriers in these nanostructures allows an investigation of several process of quantum interference, such as tunneling induced transparency. In this case, the strong tunneling coupling parameter between the quantum dots plays the role of the optical control field in the electromagnetically induced transparency phenomenon, and it can be appropriately controlled through of a voltage applied in the growth direction of the nanostructure. Simultaneously, we consider the quantum dots isolated inside a resonant cavity, considering the intermediate and strong coupling regimes. In order to use this system for application in quantum memories, is very important we consider the interaction of the confined carriers in the dot with a localized ensemble of N nuclear spins by hyperfine interaction, which in turn is a major source in this kind of system. Due to the long lifetime of nuclear spins (on order of 1-5 ms), we are particularly interested in their potential in application in quantum memories, in which their interaction with the quantum fields are mediated by the hyperfine interaction between nuclear spins and electrons and hole spins on the quantum dots.

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)

OLIVEIRA, R. R.; BORGES, H. S.; SOUZA, J. A.; VILLAS-BOAS, C. J. A multitasking device based on electromagnetically induced transparency in optical cavities. QUANTUM INFORMATION PROCESSING, v. 17, n. 11 NOV 2018. Web of Science Citations: 0.

DINIZ, E. C.; BORGES, H. S.; VILLAS-BOAS, C. J. Multiple transparency windows and Fano interferences induced by dipole-dipole couplings. Physical Review A, v. 97, n. 4 APR 19 2018. Web of Science Citations: 2.

BORGES, HALYNE S.; ROSSATTO, DANIEL Z.; LUIZ, FABRICIO S.; VILLAS-BOAS, CELSO J. Heralded entangling quantum gate via cavity-assisted photon scattering. Physical Review A, v. 97, n. 1 JAN 18 2018. Web of Science Citations: 3.

BORGES, H. S.; OLIVEIRA, M. H.; VILLAS-BOAS, C. J. Influence of the asymmetric excited state decay on coherent population trapping. SCIENTIFIC REPORTS, v. 7, AUG 2 2017. Web of Science Citations: 3.

BORGES, HALYNE S.; VILLAS-BOAS, CELSO J. Quantum PHASE gate based on electromagnetically induced transparency in optical cavities. Physical Review A, v. 94, n. 5 NOV 30 2016. Web of Science Citations: 11.

BORGES, H. S.; SANZ, L.; ALCALDE, A. M. Excitonic entanglement of protected states in quantum dot molecules. Physics Letters A, v. 380, n. 38, p. 3111-3116, SEP 7 2016. Web of Science Citations: 3.