1. A system for monitoring the integrity of a boundary comprising: a source apparatus for generating a first and a second quantum system, the first and the second quantum systems being quantum mechanically entangled in at least one monitored physical property; a transmission medium disposed adjacent the boundary; a first receiver and a second receiver; a transmission apparatus for directing the first quantum system through the transmission medium to the first receiver and for directing the second quantum system to the second receiver; an evaluation apparatus for assessing a first verifying quantum system received by the first receiver and for assessing a second verifying quantum system received by the second receiver and for estimating whether the first verifying quantum system and the second verifying quantum system are quantum mechanically entangled in the at least one monitored physical property; and an alarm apparatus for indicating a possible compromise of the boundary if the first verifying quantum system and the second verifying quantum system are not likely quantum mechanically entangled in the at least one monitored physical property.