  We investigate the problem of an infinitely heavy impurity interacting with a
dilute Bose gas at zero temperature. When the impurity-boson interactions are
short ranged, we show that boson-boson interactions induce a quantum blockade
effect, where a single boson can effectively block or screen the impurity
potential. Since this behavior depends on the quantum granular nature of the
Bose gas, it cannot be captured within a standard classical-field description.
Using a combination of exact quantum Monte Carlo methods and a truncated basis
approach, we show how the quantum correlations between bosons lead to universal
few-body bound states and a logarithmically slow dependence of the polaron
ground-state energy on the boson-boson scattering length. Moreover, we expose
the link between the polaron energy and the spatial structure of the quantum
correlations, spanning the infrared to ultraviolet physics.
