We study a qubit-oscillator system, with a time-dependent coupling coefficient, and present a fast scheme for generating entangled Schrödinger-cat states with large mean photon numbers and also a scheme that protects the cat states against dephasing caused by the nonlinearity in the system. We focus on the case where the qubit frequency is small compared to the oscillator frequency. We first present the exact quantum state evolution in the limit of infinitesimal qubit frequency. We then analyze the first-order effect of the nonzero qubit frequency. Our scheme works for a wide range of coupling strength values, including the recently achieved deep-strong-coupling regime.
In the title compound, C11H11N2O2S+·ClO4
−, the dihedral angle between the benzene and pyridinium rings is 87.33 (10)°. An intramolecular N—H⋯O interaction, with an S=O-bonded O atom as receptor, occurs in the cation. In the crystal structure, ion pairs occur, being linked by strong N—H⋯O hydrogen bonds. The perchlorate anion plays a further role in the molecular packing by accepting several weak C—H⋯O interactions.
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