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2015 ; 5
(ä): 12918
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Hybrid quantum gates between flying photon and diamond nitrogen-vacancy centers
assisted by optical microcavities
#MMPMID26271899
Wei HR
; Long GL
Sci Rep
2015[Aug]; 5
(ä): 12918
PMID26271899
show ga
Hybrid quantum gates hold great promise for quantum information processing since
they preserve the advantages of different quantum systems. Here we present
compact quantum circuits to deterministically implement controlled-NOT, Toffoli,
and Fredkin gates between a flying photon qubit and diamond nitrogen-vacancy (NV)
centers assisted by microcavities. The target qubits of these universal quantum
gates are encoded on the spins of the electrons associated with the diamond NV
centers and they have long coherence time for storing information, and the
control qubit is encoded on the polarizations of the flying photon and can be
easily manipulated. Our quantum circuits are compact, economic, and simple.
Moreover, they do not require additional qubits. The complexity of our schemes
for universal three-qubit gates is much reduced, compared to the synthesis with
two-qubit entangling gates. These schemes have high fidelities and efficiencies,
and they are feasible in experiment.