Quantum sensing promises to revolutionize sensing applications by employing
quantum states of light or matter as sensing probes. Photons are the clear
choice as quantum probes for remote sensing because they can travel to and
interact with a distant target. Existing schemes are mainly based on the
quantum illumination framework, which requires a quantum memory to store a
single photon of an initially entangled pair until its twin reflects off a
target and returns for final correlation measurements. Existing demonstrations
are limited to tabletop experiments, and expanding the sensing range faces
various roadblocks, including long-time quantum storage and photon loss and
noise when transmitting quantum signals over long distances. We propose a novel
quantum sensing framework that addresses these challenges using quantum
frequency combs with path identity for remote sensing of signatures
(qCOMBPASS"). The combination of one key quantum phenomenon and two quantum
resources, namely quantum induced coherence by path identity, quantum frequency
combs, and two-mode squeezed light, allows for quantum remote sensing without
requiring a quantum memory. The proposed scheme is akin to a quantum radar
based on entangled frequency comb pairs that uses path identity to
detect/range/sense a remote target of interest by measuring pulses of one comb
in the pair that never flew to target, but that contains target information
teleported” by quantum-induced coherence from the other comb in the pair that
did fly to target but is not detected.