  We report the design and implementation of a high-performance superconducting
quantum interference proximity transistor (SQUIPT) based on aluminum-copper
(Al-Cu) technology. With the adoption of a thin and short copper nanowire we
demostrate full phase-driven modulation of the proximity-induced minigap in the
normal metal density of states. Under optimal bias we record unprecedently high
flux-to-voltage (up to 3 mV/$\Phi_0$) and flux-to-current (exceeding 100
nA/$\Phi_0$) transfer function values at sub-Kelvin temperatures, where
$\Phi_0$ is the flux quantum. The best magnetic flux resolution (as low as 500
n$\Phi_0/\sqrt{Hz}$ at 240 mK, being limited by the room temperature
pre-amplification stage) is reached under fixed current bias. These figures of
merit combined with ultra-low power dissipation and micrometer-size dimensions
make this mesoscopic interferometer attractive for low-temperature applications
such as the investigation of the magnetization of small spin populations.
