We know that quantum key distribution is the only real and practical way to communicate securely. Several disadvantages are still limiting this technology, it is actually quite expensive to establish a quantum communication channel for Bob and Alice, unless... The same secure quantum communication can take place even if only one of the two sides is using a quantum communication device! The news appeared on NewScientist one month ago:

"It has been an article of faith among cryptographers that the only way for two parties to transmit sensitive information completely securely is to use quantum cryptography to share the key they use to encrypt the information.

 

Now it seems that the same degree of security is possible even if one party remains firmly rooted in the world of classical physics. The finding could mean simpler and cheaper secure cryptographic systems."

Unfortunately the article is not available, subscription is needed to read the rest. As far as I know there is no public paper on this specific topic, I hope information will soon become available. Of course whoever has any link to any resource is more than welcome to share it in the comments.

Stay tuned for further news!