Quantum Communication
Moving quantum information across distance, and the obstacles involved.
Quantum Communication
What is quantum communication?
Quantum communication transmits quantum states between locations, usually encoded in photons over fibre or free space.
Loss is the central obstacle, since unknown quantum states cannot be copied and therefore cannot be amplified conventionally.
Trusted-node networks are deployed today; quantum repeaters remain a research goal.
Recommended learning sequence
- Quantum CommunicationMoving quantum information across distance, and the obstacles involved.
Frequently asked questions
- What is quantum communication used for?
- Quantum key distribution, entanglement distribution between distant nodes, and protocols such as teleportation.
Lessons in this topic
Related subjects
Quantum Cryptography
Quantum cryptography uses quantum physics — chiefly the disturbance caused by measurement — to secure tasks such as key exchange.
Quantum Teleportation
Quantum teleportation transfers a quantum state between locations using shared entanglement and two classical bits.
Entanglement
Entanglement is a link between quantum systems in which the whole has a definite description while its parts do not.