Interacting two-electron model of a coherent quantum-dot single-electron turnstile

We show how coherent single-electron turnstile action in a picosecond time scale can be achieved with high probability in a triple-well semiconductor structure by means of an applied time-dependent, long-wavelength electric h eld. We demonstrate the turnstile behavior by studying the exact temporal e volution of two electrons, including their Coulomb interaction, and conside ring birth triplet and singlet states.