U of T Engineering researchers have demonstrated proof-of-principle for a device that could serve as the backbone of a future quantum Internet. Professor Hoi-Kwong Lo (ECE, Physics) and his collaborators have developed a prototype for a key element for all-photonic quantum repeaters, a critical step in long-distance quantum communication.
A quantum Internet is the ‘Holy Grail’ of quantum information processing, enabling many novel applications including information-theoretic secure communication. Today’s Internet was not specifically designed for security, and it shows: hacking, break-ins and computer espionage are common challenges. Nefarious hackers are constantly poking holes in sophisticated layers of defence erected by individuals, corporations and governments.
In light of this, researchers have proposed other ways of transmitting data that would leverage key features of quantum physics to provide virtually unbreakable encryption. One of the most promising technologies involves a technique known as quantum key distribution (QKD). QKD exploits the fact that the simple act of sensing or measuring the state of a quantum system disturbs that system. Because of this, any third-party eavesdropping would leave behind a clearly detectable trace, and the communication can be aborted before any sensitive information is lost.
Until now, this type of quantum security has been demonstrated in small-scale systems. Lo and his team are among a group of researchers around the world who are laying the groundwork for a future quantum Internet by working to address some of the challenges in transmitting quantum information over great distances, using optical fibre communication.
Because light signals lose potency as they travel long distances through fibre-optic cables, devices called repeaters are inserted at regular intervals along the line. These repeaters boost and amplify the signals to help transmit the information along the line.
But quantum information is different, and existing repeaters for quantum information are highly problematic. They require storage of the quantum state at the repeater sites, making the repeaters much more error prone, difficult to build, and very expensive because they often operate at cryogenic temperatures.
Lo and his team have proposed a different approach. They are working on the development of the next generation of repeaters, called all-photonic quantum repeaters, that would eliminate or reduce many of the shortcomings of standard quantum repeaters. With collaborators at Osaka University, Toyama University and NTT Corporation in Japan, Lo and his team have demonstrated proof-of-concept of their work in a paper recently published in Nature Communications.
“We have developed all-photonic repeaters that allow time-reversed adaptive Bell measurement,” says Lo. “Because these repeaters are all-optical, they offer advantages that traditional — quantum-memory-based matter — repeaters do not. For example, this method could work at room temperature.”
A quantum Internet could offer applications that are impossible to implement in the conventional Internet, such as impenetrable security and quantum teleportation.
“An all-optical network is a promising form of infrastructure for fast and energy-efficient communication that is required for a future quantum internet,” says Lo. “Our work helps pave the way toward this future.”
Learn more: Toward a future quantum Internet
The Latest on: Quantum internet
via Google News
The Latest on: Quantum internet
- Welcome to the quantum ageon January 25, 2021 at 6:57 am
Quantum physics means a huge change in how someone understands the world and perceives reality. There is a shift from the intuitive, straightforward classical paradigm to the quantum world that ...
- Welcome to the quantum eraon January 25, 2021 at 5:18 am
The first quantum revolution gave way to lasers and transistors while the second ushered in MRIs and GPS. But the technology still holds much more promise for the future. We tell you why quantum ...
- KEMTLS: Cloudflare trials new encryption mechanism in anticipation of post-quantum TLS shortcomingson January 25, 2021 at 4:58 am
With quantum computing looming on the horizon, Cloudflare says it has been trialing the KEMTLS protocol and plans to use post-quantum cryptography for most internal services by the end of this year.
- Opinion: The unhackable computers that could revolutionize the futureon January 23, 2021 at 10:48 pm
The unhackable computers that could revolutionize the future. With such mind-bending predictions, it is perfectly reasonable to ...
- Google vs Australia, Rockets On Oil Rigs, India’s Quantum Labs And More In This Week’s Top Newson January 23, 2021 at 4:31 am
Developing radical new technology is inherently risky, but that doesn’t make breaking this news any easier. Today, I’m sad to share that Loon will be winding down,” wrote Alastair Westgarth, CEO, Loon ...
- It’s HERE! Kibo Code Quantum Review 2021| All What You Need To Knowon January 22, 2021 at 12:00 am
Have you heard about the trending KIBO CODE QUANTUM program? There are a lot of people who have been searching the web regarding the new Kibo Code Quantum eCommerce course, everyone wants to know if ...
- Quantum communication demonstrated by two hovering droneson January 19, 2021 at 1:51 pm
The groundwork is being laid for the quantum internet -- up in the air, at least. Here's what researchers at a Chinese university recently pulled off.
- Securing the DNS in a Post-Quantum World: New DNSSEC Algorithms on the Horizonon January 18, 2021 at 4:00 pm
One of the "key" questions cryptographers have been asking for the past decade or more is what to do about the potential future development of a large-scale quantum computer. If theory holds, a ...
- Quantum internet signals beamed between drones a kilometre aparton January 17, 2021 at 5:05 am
Entangled photons have been beamed between drones and to a ground station, creating technology that could form part of an unhackable quantum internet ...
- Drones could help create a quantum interneton January 14, 2021 at 2:17 pm
The quantum internet may be coming to you via drone. Scientists have now used drones to transmit particles of light, or photons, that share the quantum linkage called entanglement. The photons were ...
via Bing News