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Optics Communications

System control by variation of the squeezing phase

P. Galatola, Luigi A. Lugiato, M. G. Porreca, P. Tombesi, Gerd Leuchs

Published Aug 1, 1991• 83 citations
Publisher
DOI
10.1016/0030-4018(91)90056-j

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Control protocols known as shortcuts to adiabaticity allow to drive a quantum system from an initial to a final state arbitrarily fast. These techniques have recently been proposed for open quantum systems, thus extending their application to allow for fast thermalization. Here, we engineer dynamical schemes for the fast preparation of squeezed thermal states at controlled temperature. We derive the equations of motion of squeezed thermal states in harmonic oscillators under unitary and open dynamics, allowing for temperature and entropy variations between the initial and final states. The counter-diabatic Hamiltonians and associated dissipators are provided, and whenever possible, given in a form relevant to experimental application.The technique is detailed in the setting of trapped-ion experiments with two-photon Raman interaction, where the desired open dynamics is obtained from stochastically shaking the trapping potential, or driving the system with a laser of stochastic amplitude. In this context, we find solutions for the control parameters---namely laser amplitude, phase, and dephasing strength---that allow creating a squeezed thermal state at controlled temperature in arbitrary time.