Boffins at UCSB (University of California, Santa Barbara) have made a breakthrough in quantum cryptography, and put together a gadget that is capable of emitting a single photon. The device is being heralded as an important step towards secure quantum communications since it will render any signal invulnerable to snooping.
According to LaboratoryNetwork, at the moment quantum communications depends on two photon systems. These can be encrypted, but eavesdroppers can't be detected.
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