  The evolution of quantum networking requires architectures capable of
dynamically reconfigurable entanglement distribution to meet diverse user needs
and ensure tolerance against transmission disruptions. We introduce multihop
quantum networks to improve network reach and resilience by enabling quantum
communications across intermediate nodes, thus broadening network connectivity
and increasing scalability. We present multihop two-qubit
polarization-entanglement distribution within a quantum network at the Oak
Ridge National Laboratory campus. Our system uses wavelength-selective switches
for adaptive bandwidth management on a software-defined quantum network that
integrates a quantum data plane with classical data and control planes,
creating a flexible, reconfigurable mesh. Our network distributes entanglement
across six nodes within three subnetworks, each located in a separate building,
optimizing quantum state fidelity and transmission rate through adaptive
resource management. Additionally, we demonstrate the network's resilience by
implementing a link recovery approach that monitors and reroutes quantum
resources to maintain service continuity despite link failures -- paving the
way for scalable and reliable quantum networking infrastructures.
