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Quantum teleportation
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Transfers a quantum state using entanglement.
An unknown qubit state can be transferred to a distant location using an entangled pair plus two classical bits; the original is destroyed. No matter is transported.
Demonstrated over 1400 km via satellite.
Cannot exceed light speed since classical bits are needed.
In more detail
Quantum teleportation transfers the quantum state of one particle to another using entanglement and classical communication. The original state is destroyed in the process, so no copy is made.
Real-world uses
- Teleportation experiments are used to test quantum communication.
- It is a building block for quantum networks.
- Physicists have demonstrated teleportation of quantum states between atoms and photons, using entanglement as a resource.
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Frequently asked questions
Does teleportation move matter instantly?
No. Classical communication is required to complete the process, and no faster-than-light signal is sent.
Is the particle itself transported?
No, only the quantum state is transferred to another particle.
Does teleportation copy the particle?
No. The original state is destroyed in the process, and classical information must be sent for the receiver to recover it.
Related topics in Quantum Mechanics
Quantum computing: qubits · Quantum gates · Quantum cryptography · Lasers · Population inversion · Einstein coefficients