  Squeezing of the quadratures of the electromagnetic field has been
extensively studied in optics and microwaves. However, previous works focused
on the generation of squeezed states in a low impedance ($Z_0 \approx 50
\Omega$) environment. We report here on the demonstration of the squeezing of
bosonic edge magnetoplasmon modes in a quantum Hall conductor whose
characteristic impedance is set by the quantum of resistance ($R_K \approx 25 k
\Omega$), offering the possibility of an enhanced coupling to low-dimensional
quantum conductors. By applying a combination of dc and ac drives to a quantum
point contact, we demonstrate squeezing and observe a noise reduction 18\%
below the vacuum fluctuations. This level of squeezing can be improved by using
more complex conductors, such as ac driven quantum dots or mesoscopic
capacitors.
