Fast Spin-Orbit Qubit in an Indium Antimonide Nanowire
Because of the strong spin-orbit interaction in indium antimonide, orbital motion and spin are no longer separated. This enables fast manipulation of qubit states by means of microwave electric fields. We report Rabi oscillation frequencies exceeding 100 MHz for spin-orbit qubits in InSb nanowires. Individual qubits can be selectively addressed due to intrinsic differences in their g factors. Based on Ramsey fringe measurements, we extract a coherence time T_2^*=8±1 ns at a driving frequency of 18.65 GHz. Applying a Hahn echo sequence extends this coherence time to 34 ns.
Additional Information© 2013 American Physical Society. Received 13 October 2012; published 8 February 2013. We thank V. E. Calado and M. Shafiei for discussions. Financial support for this work was given by ERC and The Netherlands Organisation for Scientific Research NWO/FOM.
Published - PhysRevLett.110.066806.pdf
Submitted - 1210.7229v1.pdf