Quantum Crypt is not the answer
For many reasons Quantum Cryptography is not the solution to the problem in question (when properly implemented QC is realy only applicable to crypto key distrubution etc due to it's many inherant limitations).
One problem with practical Quantum Crytpo systems is that to get it to work over any sizable distance at a reasonable bit rate you end up sending more than a single photon per bit...
So this tap may well work against Quantum Crypto if it is put close to the emitter (there is also one hell of a lot of other things you would have to do as well but hey it's enough to hang your hat on and get down to work).
Also very slowly bending the QC cable in a tight cure to increase the "line loss" is a way by which you can get somebody to change their threshold on quantum crypto systems.
Although quantum crypto is a nice idea real world implementations have to take into account a whole host of other issues (not least the same laws of physics by which it works,) that for practical purposes make QC (effectivly) a theoretical system only.
