Abstract
We consider the problem of the time-dependent degenerate parametric amplifier. We obtain the quadratic invariant and use it to derive the wave function via its su(1, 1) algebraic basis and a unitary transformation to the time-dependent Schrödinger equation for the parametric amplifier. We obtain the real and the complex invariants, which we use to solve the time-dependent Cauchy problem. Using different integrability conditions, we find the most general solution, which we analyze extensively, providing details of the calculations.
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Prepared from an English manuscript submitted by the authors; for the Russian version, see Teoreticheskaya i Matematicheskaya Fizika, Vol. 159, No. 1, pp. 142–161, April, 2009.
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Abdalla, M.S., Leach, P.G.L. Lie algebraic treatment of the quadratic invariants for a quantum system. Theor Math Phys 159, 535–550 (2009). https://doi.org/10.1007/s11232-009-0043-1
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DOI: https://doi.org/10.1007/s11232-009-0043-1