Cross-Kerr coupling in the two-photon bosonic regime of a SQUID-coupled phase qubit never vanishes due to potential asymmetry and coupler nonlinearity, with explicit limits on the number of coherent states needed for the approximation.
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Steady-state entanglement with concurrence above 0.9 is generated between optical emitters by optically tuning Rabi-split dressed states to couple via a THz channel and collective dissipation.
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Two-photon coupling via Josephson element II: Interaction dressing, cross-Kerr coupling, and limits of low-energy bosonic model
Cross-Kerr coupling in the two-photon bosonic regime of a SQUID-coupled phase qubit never vanishes due to potential asymmetry and coupler nonlinearity, with explicit limits on the number of coherent states needed for the approximation.
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Entanglement of two optical emitters mediated by a terahertz channel
Steady-state entanglement with concurrence above 0.9 is generated between optical emitters by optically tuning Rabi-split dressed states to couple via a THz channel and collective dissipation.