A controlled-NOT gate in a chain of qubits embedded in a spin field-effect transistor and its process tomographyMakoto Unoki, Hiromichi Nakazato, Kazuya Yuasa and Kanji YohEur. Phys. J. B, 86 9 (2013) 393DOI: https://doi.org/10.1140/epjb/e2013-40339-1