Vacuum-induced Stark shifts for quantum logic using a collective system in a high-quality dispersive cavity Academic Article uri icon


  • A collective system of atoms in a high-quality cavity can be described by a nonlinear interaction which arises due to the Lamb shift of the energy levels due to the cavity vacuum [Agarwal, Phys. Rev. A 56, 2249 (1997)]. We show how this collective interaction can be used to perform quantum logic. In particular we produce schemes to realize controlled-NOT gates not only for two-qubit but also for three-qubit systems. We also discuss realizations of Toffoli gates. Our effective Hamiltonian is also realized in other systems such as trapped ions or magnetic molecules. 2005 The American Physical Society.

published proceedings

  • Physical Review A

author list (cited authors)

  • Gbris, A., & Agarwal, G. S.

citation count

  • 26

complete list of authors

  • Gábris, A||Agarwal, GS

publication date

  • May 2005