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In physics, a squeezed coherent state is any state of the quantum mechanical Hilbert space such that the uncertainty principle is saturated. That is, the product of the corresponding two operators takes on its minimum value: :\Delta x \Delta p = \frac{\hbar}2 The simplest such state is the ground state |0\rangle of the quantum harmonic oscillator. The next simple class of states that satisfies this identity are the family of coherent states |\alpha\rangle. Often, the term ''squeezed state'' is used for any such state with \Delta x \neq \Delta p. The idea behind this is that the circle denoting a coherent state in a quadrature diagram (see below) has been "squeezed" to an ellipse of the same area.
[edit] About Squeezing
Squeezing is the act of gripping and pressing something firmly. It is a technique used to test the ripeness of some fruits and vegetables like apples and tomatoes, and it is also used to extract juices.



