Ciccarello, F and Browne, D E and Kwek, L C and Schomerus, Henning and Zarcone, M and Bose, S (2012) Quasideterministic realization of a universal quantum gate in a single scattering process. Physical Review A, 85 (5). ISSN 1050-2947
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 controlled-z gate (universal for quantum computation) between them. This occurs quasideterministically in a single scattering event, with no need for any postselection 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.
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