squeezed state

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A quantum state in a system in which the product in the Heisenberg uncertainty principle takes the lowest possible value, i.e. the product δx δp, where δx is the uncertainty in position and δp is the uncertainty in momentum, is equal to h/(4π), where h is the Planck constant, rather than greater than h/(4π), with analogous results for the uncertainty principle for other pairs of variables. The concept of a squeezed state is used extensively in quantum optics and in precision measurements.

Subjects: Physics.

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