Quantum Communication Technologies
Quantum Key Distribution (QKD): Uses single photons or entangled photon pairs to negotiate symmetric cryptographic keys. Its sole purpose is secure key exchange, which is then used by classical encryption algorithms (like AES) to encrypt actual data.
Quantum Teleportation: Transfers an unknown quantum state (qubit) from one location to another using quantum entanglement and classical communication, without physically transmitting the quantum particle itself.
Direct Quantum Communication: Sends actual quantum information (qubits) directly between quantum computers to perform distributed quantum computing, rather than just using quantum states to generate secret keys.
Quantum Networks & Quantum Internet: Interconnected systems using quantum repeaters and routers to relay quantum information over long distances without collapsing or measuring the quantum states along the way.
