q4h555qh5

3 ms·

1.
by q4h555qh5 10y ago
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 information theory (QIT is a big part of QM). QIT is even o
2.
by q4h555qh5 10y ago
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 of states ("because waves"). There is a lot of
3.
by q4h555qh5 11y ago
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 unmodified, it means the rest of the key probably is too, up to
4.
by q4h555qh5 11y ago
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 Distribution is completely secure so on paper the device was to
5.
by q4h555qh5 11y ago
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). QKD allows you to distribute a one-time pad while on
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by q4h555qh5 11y ago
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 program.
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by q4h555qh5 11y ago
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 possible to have entropy reduction locally. E