Deterministic realization of a universal quantum gate in a single scattering process

Details Deterministic realization of a universal quantum gate in a single scattering process Deterministic realization of a universal quantum gate in a single scattering process

2011-07-21

arxiv.org/abs/1107.4394v1

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

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 or superconducting qubits, can implement a CZ gate (universal for quantum computation) between them. This occurs 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.

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