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
- Physicists irreversibly split photons by freezing them in Bose-Einstein condensateon November 14, 2019 at 1:45 pm
"Perhaps quantum computers might one day use this method to communicate with each other and form a kind of quantum Internet," says Weitz with a view towards the future. University of Bonn. (2019, ...
- Physicists irreversibly split photons by freezing them in a Bose-Einstein condensateon November 14, 2019 at 11:02 am
"Perhaps quantum computers might one day use this method to communicate with each other and form a kind of quantum Internet," says Weitz with a view towards the future.
- New quantum data protocol takes big steps towards a 'Quantum Internet'on November 11, 2019 at 12:14 am
Everyday efforts are being made towards the creation of 'quantum internet,' and now a new network protocol has been developed that bring us even closer to its fruition. UAB researchers have managed to ...
- A Glimpse Into Honeywell’s Quantum Play Through Microsoft’s Azure Ignite Announcementon November 9, 2019 at 4:04 pm
Azure Quantum will provide internet cloud access to Honeywell’s quantum computer along with those of IonQ and QCI. The service also includes access to Microsoft's open-source Quantum Development Kit ...
- A new quantum data classification protocol brings us nearer to a future 'quantum internet'on November 8, 2019 at 9:24 am
thus setting the bases for a future "quantum internet." With the design of these quantum information networks come new theoretical challenges, given that it is necessary to establish optimised ...
- What happens at a quantum internet hackathon?on November 8, 2019 at 2:22 am
After researchers in Dublin joined forces with teams in five other cities for a pan-European Quantum Internet Hackathon, Dr Harun Šiljak describes the experience. You’re going to hear a lot more about ...
- 30th Anniversary of the Internet in Australia Celebrations sees claim of quantum supremacyon November 7, 2019 at 4:28 am
Last week, we brazenly claimed quantum supremacy at the 30th Anniversary of the Internet in Australia Celebrations when we applied an Australian-developed QuintessenceLabs true quantum powered random ...
- Quantum Computing Won’t Kill The Blockchainon November 7, 2019 at 1:46 am
we will not have to worry about quantum supremacy any time soon. (Xinxin Fan is head of Cryptography of IoTeX, a technology company that uses blockchain, secure hardware, and trusted computing to ...
- The promise and peril of post quantum computingon November 6, 2019 at 10:38 pm
That means post quantum crypto in conjunction with RSA or ECC. This is quite an interesting approach because, as many security professionals know, and obviously Internet users might know, security and ...
- What are the benefits of quantum computing?on November 6, 2019 at 3:02 am
But hold up a second. Does this mean that everything from weather forecasting to sending emails round the internet will achieve a giant speed and power leap thanks to quantum computing? And will your ...
via Bing News