A coherent beam splitter for electronic spin states

Details A coherent beam splitter for electronic spin states A coherent beam splitter for electronic spin states

2010-10-04

arxiv.org/abs/1010.0659v1

Science 327, 669 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Related papers at http://pettagroup.princeton.edu

Scientific paper

10.1126/science.1183628

Rapid coherent control of electron spin states is required for implementation of a spin-based quantum processor. We demonstrate coherent control of electronic spin states in a double quantum dot by sweeping an initially prepared spin singlet state through a singlet-triplet anti-crossing in the energy level spectrum. The anti-crossing serves as a beam splitter for the incoming spin singlet state. Consecutive crossings through the beam splitter, when performed within the spin dephasing time, result in coherent quantum oscillations between the singlet state and a triplet state. The all-electrical method for quantum control relies on electron-nuclear spin coupling and drives single electron spin rotations on nanosecond timescales.

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