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Entropy and information theory in general as discovered was Shannon has been generalized to the quantum case and a lot of the mathematical tools Shannon created are used in quantum…

I'll try to answer this by presenting two types of computations a quantum computer is good at. 1) Quantum Simulation. So in a quantum system, your state can be in a superposition o…

If someone intercepts the quantum key, it will modify it 25% of the time. If you randomly measure (and verify publicly with the sender) a fraction of your total key and find it unm…

Maybe it was for a particular implementation? Funny story: the first toy impletementation of Quantum Key Distribution used a device with rotating photon polarizers. Quantum Key Dis…

Quantum crypto is a large field. One aspect is Quantum Key Distribution (QKD). It opened the door to the whole field of quantum computing (it was discovered before Shor's algorithm…

Quantum cryptography is still applied in some places. Switzerland is using quantum crypto below lake Geneva using optic fiber. Recently, China announced a quantum crypto satellite …

QECC takes "logical qubits on a larger space" to "corrected qubits on a smaller space". So while there is entropy production on the entire space (2nd law thermo), it is still possi…