Quantum Entanglement of Quantum Dot Spin Using Flying Qubits.

摘要

This report summarizes the two years of support we received under the QuEST Program. The objective of the work has been to advance the frontier of quantum entangled semiconductor electrons using ultrafast optical techniques. The approach is based on semiconductor quantum dots doped with a single electron, made possible by the Coulomb blockade in this system. The quantum dots confine both electrons and holes and hence are optically active, enabling control of the quantum dot electron through the use of two-photon (Raman) transitions driven between the prepared electronic state to the final electronic state using the trion as a means to optically control the electronic state. The goal of the work has been to use photon interference methods to entangle electrons from different dots with inevitable differences in the frequencies of the emitted photons. The impedance matching between these two dots is mediated by photon interference using two entangled photons produced by spontaneous photon down conversion (SPDC) that can produce two entangled photons with their wavelengths tuned to match the wavelength of the photon produced by each dot.