Quantum / CONCEPT
The constraint polynomials of the two-photon Rabi model at and beyond the critical coupling
The constraint polynomials of the two-photon asymmetric quantum Rabi model factor into linear terms y + 2n(2n + 2rho - 1) at the critical coupling x = 1, and for x > 1 and nonnegative bias all their coefficients are positive, because the tridiagonal matrix behind them is positive definite.
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Proof of the conjecture for nonnegative bias
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