Abstract
We describe the use of quantum-mechanically entangled photons for sensing intrusions across a physical perimeter. Our approach to intrusion detection uses the no-cloning principle of quantum information science as protection against an intruder�s ability to spoof a sensor receiver using a �classical� intercept-resend attack. Moreover, we employ the correlated measurement outcomes from polarization-entangled photons to protect against �quantum� intercept-resend attacks, i.e., attacks using quantum teleportation. We explore the bounds on detection using quantum detection and estimation theory, and we experimentally demonstrate the underlying principle of entanglement-based detection using the visibility derived from polarization-correlation measurements.
