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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Postselection on continuous monitoring of spontaneous emission slows entanglement decay in a two-transmon system and reveals exceptional points with PT-symmetric phases in the interaction frame.
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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 Dynamics in a Two Transmon Qubit System under Continuous Measurement and Postselection
Postselection on continuous monitoring of spontaneous emission slows entanglement decay in a two-transmon system and reveals exceptional points with PT-symmetric phases in the interaction frame.