Squeezed coherent state
![Figure 1:
Measured quantum noise of the electric field of different squeezed states depends on the phase of the light field. For the first two states a 3π-interval is shown; for the last three states, belonging to a different set of measurements, it is a 4π-interval.[6]](/uploads/202502/12/Noise_squeezed_states1458.jpg)
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:
The simplest such state is the ground state 
of the quantum harmonic oscillator. The next simple class of states that satisfies this identity are the family of coherent states 
.