Gaussian Quantum Integrated Sensing and Communication

arXiv:2611.04047v1 Announce Type: new Abstract: We consider a quantum integrated sensing and communication problem over an optical link in which a low-power transmitter simultaneously communicates with a receiver and identifies the range of a defect producing a backscattered signal. We model the system as a lossy thermal-noise bosonic channel, in which the target, modeled as a beamsplitter, affects the timing of the backscattered signal through its location. Motivated by the envisioned deployment of entanglement-enabled quantum networks, we develop two protocols that allow the transmitter to leverage shared Gaussian entanglement, in the form of independent two-mode squeezed vacuum states or coupled three-mode squeezed vacuum states, to assist both sensing and communication.