A coherent beam splitter for electronic spin states

J. R. Petta, H. Lu, A. C. Gossard

Research output: Contribution to journalArticlepeer-review

233 Scopus citations


Rapid coherent control of electron spin states is required for implementation of a spin-based quantum processor. We demonstrated coherent control of electronic spin states in a double quantum dot by sweeping an initially prepared spin-singlet state through a singlet-triplet anticrossing in the energy-level spectrum. The anticrossing serves as a beam splitter for the incoming spin-singlet state. When performed within the spin-dephasing time, consecutive crossings through the beam splitter 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 singleelectron spin rotations on nanosecond time scales.

Original languageEnglish (US)
Pages (from-to)669-672
Number of pages4
Issue number5966
StatePublished - Feb 5 2010

All Science Journal Classification (ASJC) codes

  • General


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