  We theoretically put forward the concept of a phase-controlled
superconducting heat-flux quantum modulator. Its operation relies on
phase-dependent heat current predicted to occur in temperature-biased Josephson
tunnel junctions. The device behavior is investigated as a function of
temperature bias across the junctions, bath temperature, and junctions
asymmetry as well. In a realistic Al-based setup the structure could provide
temperature modulation amplitudes up to ~50 mK with flux-to-temperature
transfer coefficients exceeding ~125 mK/Phi_0 below 1 K, and temperature
modulation frequency of the order of a few MHz. The proposed structure appears
as a promising building-block for the implementation of novel-concept
caloritronic devices operating at cryogenic temperatures.
