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 memory device could make real-world quantum internet possibleon September 20, 2022 at 12:32 pm
A quantum memory device can store information at room temperature – a step towards building a quantum internet that could transmit secure data across fibre-optic cables ...
- Classiq, whose software help developers write quantum algorithms, announces new fundingon September 20, 2022 at 4:00 am
Classiq said this makes it one of the best-funded quantum software startups in the world. Classiq has created a unique platform that enables developers to build quantum algorithms and applications ...
- Diamond quantum sensors could extend EV driving range 10%, researchers claimon September 19, 2022 at 5:00 am
A new type of sensor could improve the accuracy of EV range estimates, which could effectively unlock more range for drivers, IEEE Spectrum reports. Scientists in Japan are experimenting with ...
- Are Quantum Computers A Threat To Cryptocurrency?on September 18, 2022 at 11:31 am
Cryptocurrency gets its name from "cryptography," which quantum computers could crack, threatening not just crypto but the entire internet.
- The Internet of Things Needs Crypto-Agility and PKI to Survive Quantum Computing Attacks — Here’s Whyon September 16, 2022 at 2:53 pm
The post The Internet of Things Needs Crypto-Agility and PKI to Survive Quantum Computing Attacks — Here’s Why appeared first on Keyfactor.
- What are quantum-resistant algorithms—and why do we need them?on September 15, 2022 at 12:49 am
When quantum computers become powerful enough, they could theoretically crack the encryption algorithms that keep us safe. The race is on to find new ones.
- A Retrospective Post-Quantum Policy Problemon September 14, 2022 at 6:34 am
This bill directs the Office of Management and Budget to begin the migration of U.S. government information technology systems to post-quantum cryptography a year after the National Institute of ...
- How the CHIPS Act supercharges the US quantum industryon September 13, 2022 at 11:30 am
The recently passed CHIPS and Science Act authorizes new efforts to advance quantum technologies and presents a new opportunity to double down on our advancements.
- The scary future of the internet: How the tech of tomorrow will pose even bigger cybersecurity threatson September 13, 2022 at 6:36 am
Innovations including quantum computing, AI and smart cities could bring a range of benefits to everyone - but hackers will also be looking to exploit them.
- Harvard and Amazon launch alliance to tackle quantum scienceon September 12, 2022 at 10:12 am
Quantum computing, which uses quantum mechanics to boost the capabilities of computers, has long been cited as an up-and-coming technology in web3.
via Bing News