Normally, the environment of a quantum system could be supposed to be a thermal state, or a squeezed vacuum state or a squeezed thermal state. Then can these baths be realized or simulated in experiments?
Yes they can. An atom that is in an optical cavity is a quantum system that interacts with the optical field modes of the cavity. The field in the cavity can be prepared in the state you are interested in. A thermal state describes the light emitted by a discharge lamp. A squeezed vacuum can be generated using an optical parametric amplifier (a special nonlinear crystal) with a vacuum input. The amplifier is driven using a stable laser at twice the optical frequency. For a squeezed thermal state the input mode of the optical parametric amplifier would be a thermal field. Does that help?
@Joan Vaccaro
Dear Ma,am,
what is this special nonlinear crystal? i hope it would act as a squeezing operator.but i want to know about this.
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