Retinal photon / Rétine par les photons
(2017 Apr) It is known that the eye’s scotopic photodetectors, rhodopsin molecules and their associated phototransduction mechanism leading to light perception, are efficient single photon counters. We here use the photon counting principles of human rod vision to propose a secure quantum biometric identification based on the quantum-statistical properties of retinal photon detection. The photon path along the human eye until its detection by rod cells is modeled as a filter having a specific transmission coefficient. Precisely determining its value from the photodetection statistics registered by the conscious observer is a quantum parameter estimation problem that leads to quantum secure identification method. The probabilities for a false positive and a false negative identification of this biometric technique can readily approach 10-10 and 10-4, respectively. The security of the biometric method can be further quantified by the physics of quantum measurements. An impostor must be able to perform quantum thermometry and quantum magnetometry with energy resolution better than 10-9~, in order to foil the device by non-invasively monitoring the biometric activity of a user.
(my explanation -less complicated I hope-)
This is a very attractive biometric modality, because it involves the brain, and so we should have quite a natural aliveness detection -at first sight- (if I can say that, speaking of retina :)
From a security point of view, there are some important details:
Unprecedented level of security: maybe or maybe not. Yes if some aliveness detection is added to check that the source is sending photons to a real eye.
That said, I have been impressed by this proposal, likely one of the most potentially secure biometric modality I have ever seen, because the brain is involved (and I think I know a little bit about this topic :).
The tongue and its taste sensors, connected to the brain, should work the same... but well, not that pratical.