Researchers at LMU and the University of Singapore have experimentally realized an expanded form of quantum cryptography for the first time.
- Its coding protocol is device-independent, making it even more secure than previous quantum cryptographic methods.
- The research lays the foundation for future quantum networks, in which absolutely secure communication is possible between far distant locations.
The Internet is teeming with highly sensitive information. Sophisticated encryption techniques generally ensure that such content cannot be intercepted and read. But in the future high-performance quantum computers could crack these keys in a matter of seconds.
Quantum key distribution (QKD) – as the jargon has it – is secure against attacks on the communication channel. This renders QKD immune against outside attacks from quantum computers, but not against attacks from or manipulations of the devices themselves. The devices could output a key which the manufacturer had previously saved and might conceivably have forwarded to a hacker. But device-independent QKD (abbreviated to DIQKD) is capable of testing the security of the devices. Theoretically known since the 1990s, this method has now been experimentally realized for the first time, by an international research group led by LMU physicist Harald Weinfurter and Charles Lim from the National University of Singapore (NUS).
In the present experiment, the physicists used two entangled rubidium atoms, situated in two laboratories located 400 meters from each other on the LMU campus, for the key distribution. The two locations are connected via a fiber optic cable 700 meters in length, which runs beneath Geschwister Scholl Square in front of the main building.
To exchange a key, the two parties measure the quantum states of their atoms. In each case, this is done randomly in two or four directions. If the directions correspond, the measurement results are identical on account of entanglement and can be used to generate a secret key. With the other measurement results, a so-called Bell inequality can be evaluated. John Bell originally developed these inequalities to test whether nature can be described with hidden variables. In DIQKD, the test is now being used “to ensure that there are no manipulations at the devices – that is to say, that hidden measurement results have not been saved in the devices beforehand,” explains Weinfurter.
The NUS protocol now uses two measurement settings. “This makes it much more difficult to intercept information. And so more noise can be tolerated and secret keys can be generated even when there is more noise,” says Charles Lim.
“With our method, we can securely generate secret keys even with uncharacterized and potentially untrustworthy devices,” explains Weinfurter. “Our work lays the foundation for future quantum networks, in which absolutely secure communication is possible between far distant locations,” says Charles Lim.
Original Article: Quantum cryptography: Hacking futile
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
- MUCSE introduces first commercial post-quantum cryptography chip ready for the post-quantum era
MUCSE, a pioneer in security and integrated circuit, announced its latest secure chip -- PQC 1.0. The PQC 1.0 is believed to be the first commercial post-quantum security chip supporting the recent ...
- JPMorgan hires scientist Charles Lim to help protect financial system from quantum-supremacy threat
Tech giants including Alphabet and IBM are racing toward building a quantum computer, and financial firms including JPMorgan are exploring possible uses.
- Hack Post-Quantum Cryptography Now So That Bad Actors Don’t Do It Later
The U.S. government should consider offering a public cash bounty to anyone who can crack the new forms of encryption that are being rolled out to defend against quantum computers.
- ‘Quantum cryptography’ raises possibility of unbreakable codes
Scientists have achieved a new form of quantum cryptography that harnesses the laws of physics to create unbreakable codes.The new system, described in the jour ...
- Quantum cryptography: Hacking is futile
An international team has successfully implemented an advanced form of quantum cryptography for the first time. Moreover, encryption is independent of the quantum device used and therefore even more ...
Go deeper with Google Headlines on:
Go deeper with Bing News on:
- ‘Quantum Navy’ Video Series to Launch on Naval Research Lab’s YouTube Channel
Looking for the latest Government Contracting News? Read about 'Quantum Navy' Video Series to Launch on Naval Research Lab's YouTube Channel.
- First demonstration of a secure quantum network with untrusted quantum devices
An international team comprising researchers from the National University of Singapore (NUS) and LMU Munich (LMU) have, for the first time, successfully demonstrated a new form of quantum key ...
- Rick Cosnett Joins ‘Mrs. American Pie’; Georgina Reilly In ‘Quantum Leap’
EXCLUSIVE: Rick Cosnett (The Flash) has joined the cast of Apple TV+’s Mrs. American Pie in a recurring role. Mrs. American Pie is an upcoming female-led comedy series following Maxine Simmons ...
- Bosch’s new partnership aims to explore quantum digital twins
Bosch's partnership with Multiverse Computing is an example of how many legacy companies are exploring quantum computing today to prepare for more capable hardware.
- NRL Launches Quantum Navy YouTube Series
The Great Power Competition Mark your calendars! Quantum Navy, a new three-part video series, is coming to our YouTube channel Wednesday, Aug. 3. WASHINGTON, Aug. 01, 2022 (GLOBE NEWSWIRE) -- The U.S.