  In dark matter axion searches, quantum uncertainty manifests as a fundamental
noise source, limiting the measurement of the quadrature observables used for
detection. We use vacuum squeezing to circumvent the quantum limit in a search
for a new particle. By preparing a microwave-frequency electromagnetic field in
a squeezed state and near-noiselessly reading out only the squeezed quadrature,
we double the search rate for axions over a mass range favored by recent
theoretical projections. We observe no signature of dark matter axions in the
combined $16.96-17.12$ and $17.14-17.28\space\mu\text{eV}/c^2$ mass window for
axion-photon couplings above $g_{\gamma} = 1.38\times g_{\gamma}^\text{KSVZ}$,
reporting exclusion at the 90% level.
