Long-distance entanglement distribution using individual atoms in optical cavities
Sørensen, A. S.Note: Order does not necessarily reflect citation order of authors.
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CitationBorregaard, J., P. Kómár, E. M. Kessler, M. D. Lukin, and A. S. Sørensen. 2015. “Long-Distance Entanglement Distribution Using Individual Atoms in Optical Cavities.” Physical Review A 92 (1) (July). doi:10.1103/physreva.92.012307.
AbstractIndividual atoms in optical cavities can provide an efficient interface between stationary qubits and flying qubits (photons), which is an essential building block for quantum communication. Furthermore, cavity-assisted controlled-not (cnot) gates can be used for swapping entanglement to long distances in a quantum repeater setup. Nonetheless, dissipation introduced by the cavity during the cnot may increase the experimental difficulty in obtaining long-distance entanglement distribution using these systems. We analyze and compare a number of cavity-based repeater schemes combining various entanglement generation schemes and cavity-assisted cnot gates. We find that a scheme, where high-fidelity entanglement is first generated in a two-photon detection scheme and then swapped to long distances using a recently proposed heralded controlled-Z (cz) gate, exhibits superior performance compared to the other schemes. The heralded gate moves the effect of dissipation from the fidelity to the success probability of the gate thereby enabling high-fidelity entanglement swapping. As a result, high-rate entanglement distribution can be achieved over long distances even for low cooperativities of the atom-cavity systems. This high-fidelity repeater is shown to outperform the other cavity-based schemes by up to two orders of magnitude in the rate for realistic parameters and large distances (1000 km).
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:27726997
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