Quantum cryptography involves using quantum mechanical properties to perform cryptographic tasks. It includes Quantum Key Distribution (QKD), which allows two parties to produce a shared random secret key known only to them, which can be used for secure communication.
It addresses the fundamental limitations of classical cryptography by providing a method for secure key exchange that cannot be intercepted without detection.
Quantum cryptography works by encoding information in the state of quantum particles like photons. Any attempt to intercept or measure these states will alter their properties, thus alerting the communicating parties that their security has been compromised. This is based on Heisenberg's uncertainty principle and the no-cloning theorem.
Quantum cryptographic devices, such as QKD systems, require precise control over quantum states. This involves complex optical setups and sensitive detectors to maintain coherence and minimize noise.
The build process includes designing and fabricating components like lasers, photodetectors, and modulators, followed by integration into a coherent system that can operate in real-world environments.
Field units draw low hundreds of watts; fabrication is energy-intensive due to vacuum baking and cooling requirements.
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