Physics – Quantum Physics
Scientific paper
2009-02-09
Phys. Rev. A 79, 022304 (2009)
Physics
Quantum Physics
10 pages with 8 figures, extended version of arXiv:0807.3645
Scientific paper
10.1103/PhysRevA.79.022304
We demonstrate theoretically a scheme for cluster state generation, based on atomic ensembles and the dipole blockade mechanism. In the protocol, atomic ensembles serve as single qubit systems. Therefore, we review single-qubit operations on qubit defined as collective states of atomic ensemble. Our entangling protocol requires nearly identical single-photon sources, one ultra-cold ensemble per physical qubit, and regular photodetectors. The general entangling procedure is presented, as well as a procedure that generates in a single step Q-qubit GHZ states with success probability p_success ~ eta^{Q/2}, where eta is the combined detection and source efficiency. This is significantly more efficient than any known robust probabilistic entangling operation. GHZ states form the basic building block for universal cluster states, a resource for the one-way quantum computer.
Kok Pieter
Zwierz Marcin
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