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Quantum Teleportation

Quantum teleportation destroys quantum information so it can appear elsewhere. Its name was inspired by similarities with teleportation in science fiction, but quantum teleportation doesn’t break any laws of physics.

Physics dictates that the qubits that carry quantum information cannot be copied, so teleportation offers a way to move quantum data around networks, or quantum processors.

To teleport quantum information, we need to share a pair of entangled qubits between a sender and receiver. One of the entangled qubits is destroyed, together with the input qubit, which teleports the input data onto the receivers remaining qubit.

The destruction of the qubits reveals no information about the information encoded on the input, but does indicate if any adjustment to the target qubit is necessary, so teleportation is not faster than light speed.

 

Entangled LEDs

Entangled photon pairs can generated by a device similar to our Single Photon LED, by controlling the shape of the quantum dot inside. In our research, we use entangled photons from these devices to teleport optical qubits.

 

An input photon is destroyed together with an entangled photon so the quantum information reappears at the target.

References:
[Technical]  J. Nilsson et al. “Quantum teleportation using a light-emitting diode” Nature Photonics, vol 7, no 4, pp. 311-315 (2013) 
[Technical] R. M. Stevenson et al. “Indistinguishable Entangled Photons Generated by a Light-Emitting Diode” Phys. Rev. Lett., vol 108, no 4, 040503 (2012)
[Technical] C. L. Salter et al. “An entangled-light-emitting diode” Nature, vol 465, no 7298, pp. 594-597 (2010)