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Quantum teleportation is a technique for transferring quantum information from a sender at one location to a receiver some distance away. While teleportation is commonly portrayed in science fiction as a means to transfer physical objects from one location to the next, quantum teleportation only transfers quantum information.
For example, the KLM protocol can be used to implement a Controlled NOT 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 ...
Diagram for quantum teleportation of a photon. A true quantum repeater allows the end to end generation of quantum entanglement, and thus – by using quantum teleportation – the end to end transmission of qubits. In quantum key distribution protocols one can test for such entanglement. This means that when making encryption keys, the sender ...
Quantum teleportation promises a leap into the next great era of computing -- but first we've got to get it working consistently. Scientists at the Kavli Institute of Nanoscience Delft say they've ...
For example, measuring qubits as early as possible can reduce the maximum number of simultaneously stored qubits; potentially enabling an algorithm to be run on a smaller quantum computer or to be simulated more efficiently. Alternatively, deferring all measurements until the end of circuits allows them to be analyzed using only pure states.
In quantum teleportation, a sender wishes to transmit an arbitrary quantum state of a particle to a possibly distant receiver. Consequently, the teleportation process is a quantum channel. The apparatus for the process itself requires a quantum channel for the transmission of one particle of an entangled-state to the receiver.
Entanglement swapping is a form of quantum teleportation. In quantum teleportation, the unknown state of a particle can be sent from one location to another using the combination of a quantum and classical channel. The unknown state is projected by Alice onto a Bell state and the result is communicated to Bob through the classical channel. [4]
[citation needed] In 1999, Gottesman and Chuang pointed out that one can prepare the probabilistic gates offline from the quantum circuit by using quantum teleportation. [4] The basic idea is that each probabilistic gate is prepared offline, and the successful event signal is teleported back to the quantum circuit.