Experimental set-up of the quantum teleportation device including an entangled light-emitting diode (ELED) and an assortment of beam splitters polarization controllers, detectors, and photodiodes. The researchers demonstrated that the device can generate single pairs of entangled photons with advantages compared with using a laser due to the electrical control provided by the ELED. Credit: J. Nilsson, et al. ©2013 Macmillan Publishers Limited. All rights reserved.

 

Quantum teleportation performed with light from a quantum dot embedded in an LED

March 15, 2013 by Lisa Zyga

(Phys.org) —In a new study, physicists have teleported photonic qubits made of pairs of entangled photons that are generated by an LED containing an embedded quantum dot. The novel set-up has advantages compared to the conventional method of generating entangled photons using a laser, and could lead to a simplified technique for implementing quantum teleportation in quantum information applications.

The researchers, J. Nilsson, et al., at Toshiba Research Europe Limited and the University of Cambridge, both in Cambridge, UK, have published their paper on demonstrating quantum teleportation using an LED in a recent issue of Nature Photonics.

As the scientists explain, quantum teleportation—a process in which quantum information is destroyed so that it may be transferred simultaneously to another location—has been proposed as a way to create quantum communication networks and quantum computing protocols despite the no-cloning theorem. According to the no-cloning theorem, quantum information cannot be copied. Although no-cloning enables quantum cryptography to have a high degree of security, it also limits the options to create quantum communication networks and increases the losses in quantum computing due to imperfect measurements.

Teleporting the information may offer a solution for these two areas. In quantum communication networks, teleportation can establish a quantum channel between two nodes. In quantum computing, teleportation can transfer qubits from successful logic operations, while the other qubits can be thrown out. Although quantum teleportation can be implemented with different systems, the researchers here argue that photonic qubits are best suited for the largest number of applications.

One of the most important parts of the photonic teleportation process is having a light source that produces single pairs of entangled photons. Although lasers can be used to generate the photons, they involve practical complexities and sometimes generate multiple photon pairs, and these problems have inhibited their use in quantum information technologies.

Read more: Quantum teleportation performed with light from a quantum dot embedded in an LED — phys.org.

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