For the first time, a team led by Innsbruck physicist Ben Lanyon has sent a light particle entangled with matter over 50 km of optical fiber. This paves the way for the practical use of quantum networks and sets a milestone for a future quantum internet.
The quantum internet promises absolutely tap-proof communication and powerful distributed sensor networks for new science and technology. However, because quantum information cannot be copied, it is not possible to send this information over a classical network. Quantum information must be transmitted by quantum particles, and special interfaces are required for this. The Innsbruck-based experimental physicist Ben Lanyon, who was awarded the Austrian START Prize in 2015 for his research, is researching these important intersections of a future quantum Internet. Now his team at the Department of Experimental Physics at the University of Innsbruck and at the Institute of Quantum Optics and Quantum Information of the Austrian Academy of Sciences has achieved a record for the transfer of quantum entanglement between matter and light. For the first time, a distance of 50 kilometers was covered using fiber optic cables. “This is two orders of magnitude further than was previously possible and is a practical distance to start building inter-city quantum networks,” says Ben Lanyon.
Converted photon for transmission
Lanyon’s team started the experiment with a calcium atom trapped in an ion trap. Using laser beams, the researchers write a quantum state onto the ion and simultaneously excite it to emit a photon in which quantum information is stored. As a result, the quantum states of the atom and the light particle are entangled. But the challenge is to transmit the photon over fiber optic cables. “The photon emitted by the calcium ion has a wavelength of 854 nanometers and is quickly absorbed by the optical fiber”, says Ben Lanyon. His team therefore initially sends the light particle through a nonlinear crystal illuminated by a strong laser. Thereby the photon wavelength is converted to the optimal value for long-distance travel: the current telecommunications standard wavelength of 1550 nanometers. The researchers from Innsbruck then send this photon through a 50-kilometer-long optical fiber line. Their measurements show that atom and light particle are still entangled even after the wavelength conversion and this long journey.
Even greater distances in sight
As a next step, Lanyon and his team show that their methods would enable entanglement to be generated between ions 100 kilometers apart and more. Two nodes send 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 100-kilometer node spacing now a possibility, one could therefore envisage building the world’s first intercity light-matter quantum network in the coming years: only a handful of trapped ion-systems would be required on the way to establish a quantum internet between Innsbruck and Vienna, for example.
Learn more: Entanglement sent over 50 km of optical fiber
The Latest on: Quantum internet
via Google News
The Latest on: Quantum internet
- Quantum Collaboration: Early Coordination Efforts Will Speed Adoptionon October 11, 2021 at 6:15 am
Companies that seek direction or guidance on how best to implement or plan for quantum computing have some exciting groups to keep an eye on.
- Telecom secretary asks C-DoT to work on 6G, launches Quantum Communication Labon October 10, 2021 at 2:37 am
A statement said C-DoT has become the first organization in India to offer complete portfolio of indigenous quantum secure telecom products and soluti..
- How Quantum Computing is good for the Environmenton October 9, 2021 at 12:27 pm
I was asked this question recently and I could not provide a good answer. I asked a few smart people and they came up with these points.
- RIT, photonic company build quantum chip prototype to bridge quantum and traditional network bandson October 8, 2021 at 5:12 am
Quantum computing just became more entangled. Researchers from Rochester Institute of Technology and national photonic device company, AdvR Inc., built a quantum chip prototype that is bridging ...
- Quantum networking milestone in real-world environmenton October 7, 2021 at 10:06 am
A team has developed and demonstrated a novel, fully functional quantum local area network, or QLAN, to enable real-time adjustments to information shared with geographically isolated systems using ...
- RidgeGate in Lone Tree Partners with Quantum Fiber to Deliver Gigabit Interneton October 7, 2021 at 9:15 am
New project will become Colorado’s first fiber-to-the-home development that will deliver service to the community's every home and business.
- ORNL team develops quantum local area network that could lead to internet faster than speed of lighton October 6, 2021 at 2:16 pm
Could the internet of the future be faster than the speed of light? That’s what a team at Oak Ridge National Laboratory created on a smaller scale at the Department of Energy site. The team, ...
- Researchers reach quantum networking milestone in real-world environmenton October 6, 2021 at 2:10 pm
A team from the U.S. Department of Energy's Oak Ridge National Laboratory, Stanford University and Purdue University developed and demonstrated a novel, fully functional quantum local area network, or ...
- Post-Quantum Cryptography: Protecting Today from Tomorrowon October 5, 2021 at 8:51 am
Crafting more difficult algorithms to protect secrets so they are resilient to future quantum computers is creating, in effect, post-quantum cryptography.
- BT and Toshiba to build quantum-secured network in Londonon October 5, 2021 at 8:25 am
BT and Toshiba will stage the world’s first commercial trial of quantum-secure network infrastructure in London, connecting sites in Docklands, the City, and along the M4 corridor. The two companies ...
via Bing News