Scientific Results

Insight on future quantum networks

Year: 2012

Authors: Sciarrino F., Mataloni P.

Autors Affiliation: Dipartimento di Fisica, Sapienza Università di Roma, I-00185 Rome, Italy; Istituto Nazionale di Ottica (INO-CNR), I-50125 Florence, Italy

Abstract: In the past few years, significant improvements have been achieved in quantum communication. To extend the communication range, however, a new technology based on quantum memories needs to be developed. In PNAS, Bao et al. (1) give an example of the building blocks of the quantum communication networks we may expect to see in the future. These complex systems will be built on the basic ingredients of quantum state teleportation and quantum memories and will expand over relatively large distances.
Quantum teleportation (2), one of the most spectacular protocols realized so far in the framework of quantum information, is a mysterious way to transport the information associated with the state of a quantum system. Quantum states are very fragile; indeed, they are easily destroyed by a single measurement. Quantum mechanics tells us that we cannot extract the complete information about a quantum state by a single measurement. For this reason, quantum states cannot be copied and transmitted by performing a direct measurement and then using a classic communication channel. Nevertheless, by using the entanglement existing among different quantum systems, quantum teleportation allows one to transfer from one place to another the information encoded in particular degrees of freedom of the particle involved in the process, such as the spin of the particle or the polarization of a photon, without the need for any transport of the particle. Accordingly, it corresponds to the disembodied transport of a quantum state.

Journal/Review: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Volume: 109 (50)      Pages from: 20169  to: 20170

More Information: Commentary to: Quantum teleportation between remote
atomic-ensemble quantum memories
KeyWords: PODOLSKY-ROSEN CHANNELS; ATOMIC ENSEMBLES; LINEAR OPTICS; TELEPORTATION; MATTER STATE
DOI: 10.1073/pnas.1218531110

Citations: 4
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English