  Since their inception, superconducting nanowire single-photon detectors have
been enabling quantum optical applications and the rise of the photonic quantum
industry. The evolution in the detector design and read-out strategies has led
to the introduction of devices with a plurality of independent pixels, which
have been able to operate with high system detection efficiency at high speed
while also supporting photon number resolution capabilities. However, this
comes at the cost of a complex readout that requires one coaxial cable for each
pixel of the array. Here, we report a 28-pixel SNSPD with a dedicated parallel
architecture that, while maintaining a simple readout with a single coaxial
line, enables the detector to operate at high speed with low-performance
degradation. The device shows a maximum single-photon efficiency (SDE) of 88%
and is able to maintain its SDE above 50%, coupled with a timing jitter lower
than 80~ps, up to a detection rate of 200 million counts per second (Mcps). The
detector also provides state-of-the-art PNR performances with a 2-photon
efficiency of 75% and a 3-photon efficiency of 60%.
