Manipulação coerente de spins em pontos quânticos semicondutores

Abstract

Spin states of an electron trapped in a quantum dot is a strong candidate for qubit implementation in solid-state systems. Here we use a sequence of polarized laser pulses to coherent manipulate the spin degree of freedom of one electron trapped in a quantum dot. To achieve that we use an external magnetic eld, and manipulate dierent parameters as pulse duration, relative pulse polarization and phase. Moreover, we show that one approximation frequently used in this system is not valid, neglecting one of the levels and making it a lambda system cannot be applied when a trion is created.