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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.
This separation of the physical application of the gate from the target qubit can be useful in cases where applying the gate directly to the target qubit may be more likely to destroy it than to apply the desired operation.
For example, the
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.
This separation of the physical application of the gate from the target qubit can be useful in cases where applying the gate directly to the target qubit may be more likely to destroy it than to apply the desired operation.
For example, the KLM protocol
The KLM scheme or KLM protocol is an implementation of linear optical quantum computing (LOQC), developed in 2000 by Emanuel Knill, Raymond Laflamme and Gerard J. Milburn. This protocol makes it possible to create universal quantum computers sol ...
can be used to implement a Controlled NOT gate
In computer science, the controlled NOT gate (also C-NOT or CNOT), controlled-''X'' gate'','' controlled-bit-flip gate, Feynman gate or controlled Pauli-X is a quantum logic gate that is an essential component in the construction of a gate-based ...
gate on a photonic quantum computer, but the process can be prone to errors that destroy the target qubits.
By using gate teleportation, the CNOT operation can be applied to a state that can be easily recreated if it is destroyed, allowing the KLM CNOT to be used in long-running quantum computations without risking the rest of the computation.
Additionally, gate teleportation is a key component of magic state distillation
Magic state distillation is a method for creating more accurate quantum states from multiple noisy ones, which is important for building fault tolerant quantum computers. It has also been linked to quantum contextuality, a concept thought to contr ...
, a technique that can be used to overcome the limitations of the Eastin-Knill theorem.
Quantum gate teleportation has been demonstrated in various types of quantum computers, including linear optical,
superconducting quantum computing
Superconducting quantum computing is a branch of solid state quantum computing which implements superconducting electronic circuits using superconducting qubits as artificial atoms, or quantum dots. For superconducting qubits, the two logic states ...
,
and trapped ion quantum computing.
References
{{Quantum information Quantum information science Quantum_gates