Sensing intruders using entanglement: a photonic quantum fence
2009
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.
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