Quasideterministic realization of a universal quantum gate in a single scattering process
arXiv:1107.4394 · doi:10.1103/PhysRevA.85.050305
Abstract
We show that a flying particle, such as an electron or a photon, scattering along a one-dimensional waveguide from a pair of static spin-1/2 centers, such as quantum dots, can implement a CZ gate (universal for quantum computation) between them. This occurs quasi-deterministically in a single scattering event, hence with no need for any post-selection or iteration, {and} without demanding the flying particle to bear any internal spin. We show that an easily matched hard-wall boundary condition along with the elastic nature of the process are key to such performances.
7 pages, 3 figures (including Suppl. Mater.)
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