Quantum gates | Quantum information science
Quantum gate teleportation
Quantum gate teleportation is a quantum circuit construction where a gate is applied to target qubits by first applying the gate to an entangled state and then teleporting the target qubits through that entangled state. Gate teleportation is useful because it allows the physical application of the gate to be separated from the involvement of the intended target qubits.For example, photonic quantum computers can implement a Controlled NOT gate using the KLM protocol, but this process is more likely to destroy the target qubits than it is to apply the intended CNOT operation.However, the success or failure of the KLM CNOT gate is heralded by the measurement results within the protocol (you can tell if it succeeded at applying the CNOT or if it destroyed the qubits).By using gate teleportation, the CNOT is applied to a state that can easily be recreated if destroyed.This makes it viable to use the KLM CNOT in long running quantum computations, because the fallible part of the process can be repeated until it succeeds without risking the rest of the computation. Gate teleportation is also a key component of magic state distillation, which can be used to circumvent the Eastin-Knill theorem. Quantum gate teleportation has been experimentally demonstrated in linear optical quantum computing,superconducting quantum computing,and trapped ion quantum computing. (Wikipedia).
