  The realization of large-scale photonic circuit for quantum optics
experiments at telecom wavelengths requires an increasing number of integrated
detectors. Superconductive nanowire single photon detectors (SNSPDs) can be
easily integrated on chip and they can efficiently detect the light propagating
inside waveguides. The thermal budget of cryostats poses a limit on the maximum
number of elements that can be integrated on the same chip due to the thermal
impact of the readout electronics. In this paper, we propose and implement a
novel scheme able for an efficient reading of several SNSPDs with only one
readout port, enabling the realization of photonic circuits with a large number
of modes.
