  The ability to precisely discriminate multiple quantum channels is
fundamental to achieving quantum enhancements in data-readout, target
detection, pattern recognition, and more. Optimal discrimination protocols
often rely on entanglement shared between an incident probe and a protected
idler-mode. While these protocols can be highly advantageous over classical
ones, the storage of idler-modes is extremely challenging in practice. In this
work, we explicitly define idler-free protocols based on the use of
multipartite entangled probe states. We show that using non-disjoint
distributions of multipartite probe states over multi-channels can be described
by dynamic discrimination protocols. Analytical bounds for their error
probabilities are derived for arbitrary pattern size, revealing idler-free
protocols that display performance close to idler-assistance for powerful,
near-term quantum sensing applications.
