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The quantum information superhighway guarantees fully faucet-proof verbal exchange and powerful disbursed sensor networks for new science and expertise. although, because quantum counsel can not be copied, it is not viable to ship this counsel over a classical network. Quantum information must be transmitted via quantum particles, and special interfaces are required for this. The Innsbruck-based experimental physicist Ben Lanyon, who was awarded the Austrian birth Prize in 2015 for his research, is investigating these essential intersections of a future quantum cyber web.

Now his team at the branch of Experimental Physics at the tuition of Innsbruck and at the Institute of Quantum Optics and Quantum guidance of the Austrian Academy of Sciences has carried out a list for the transfer of quantum entanglement between count and light-weight. For the primary time, a distance of 50 kilometers turned into lined the use of fiber optic cables. "here is two orders of magnitude additional than changed into prior to now possible and is a realistic distance to start constructing inter-metropolis quantum networks," says Ben Lanyon.

converted photon for transmission

Lanyon's team begun the scan with a calcium atom trapped in an ion trap. the use of laser beams, the researchers write a quantum state onto the ion and concurrently excite it to emit a photon through which quantum counsel is saved. in consequence, the quantum states of the atom and the light particle are entangled. but the problem is to transmit the photon over fiber optic cables. "The photon emitted through the calcium ion has a wavelength of 854 nanometers and is instantly absorbed with the aid of the optical fiber," says Ben Lanyon. His team hence firstly sends the light particle through a nonlinear crystal illuminated by a strong laser. Thereby the photon wavelength is converted to the optimal cost for long-distance travel: the present telecommunications regular wavelength of 1550 nanometers. The researchers from Innsbruck then send this photon via a 50-kilometer-lengthy optical fiber line. Their measurements show that atom and lightweight particle are nonetheless entangled even after the wavelength conversion and this long journey.

Even improved distances in sight

As a subsequent step, Lanyon and his team exhibit that their methods would enable entanglement to be generated between ions one hundred kilometers apart and more. Two nodes ship each an entangled photon over a distance of 50 kilometers to an intersection where the light particles are measured in such a way that they lose their entanglement with the ions, which in turn would entangle them. With a hundred-kilometer node spacing now a opportunity, one could therefore envisage constructing the realm's first intercity light-rely quantum network in the coming years: handiest a handful of trapped ion-methods could be required on the way to set up a quantum internet between Innsbruck and Vienna, for example.

Lanyon's group is a component of the Quantum cyber web Alliance, a world undertaking inside the Quantum Flagship framework of the european Union. The current consequences were published in the Nature journal Quantum guidance.

more tips: V. Krutyanskiy et al, mild-count entanglement over 50 km of optical fibre, npj Quantum information (2019). DOI:

quotation: Entanglement sent over 50 km of optical fiber (2019, August 29) retrieved 2 September 2019 from

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