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    Using Quantum Physics to Secure Wireless Devices

    April 26, 2023, Categories  Physics, Technology/Electronics

    Using quantum physics to secure wireless devices
    Physically unclonable function (PUF) based cryptographic keys generated by the PT-symmetric electronic system. a Illustration of the PUF-enabled secure radio-frequency (RF) authentication and communication. b Generation of the challenge-response pair (CRP) and the cryptographic key in the proposed PUF system. Our experiments utilize the pulse excitation shown in the left panel of b, and the response, represented by the transient voltage signal measured across the reader’s capacitor, and its discretized form are shown in the middle and right panels of b, respectively. After proper sampling and processing, the analog response is converted to a digital key composed of a bitstring. Credit: Nature Communications (2023). DOI: 10.1038/s41467-023-36508-x

    From access cards and key fobs to Blu...

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    Artificial Intelligence Reduces a 100,000-equation Quantum Physics problem to only Four Equations

    September 28, 2022, Categories  Physics, Technology/Electronics

    A visualization of a mathematical apparatus used to capture the physics and behavior of electrons moving on a lattice. Each pixel represents a single interaction between two electrons. Until now, accurately capturing the system required around 100,000 equations — one for each pixel. Using machine learning, scientists reduced the problem to just four equations. That means a similar visualization for the compressed version would need just four pixels. Domenico Di Sante/Flatiron Institute

    Researchers trained a machine learning tool to capture the physics of electrons moving on a lattice using far fewer equations than would typically be required, all without sacrificing accuracy.

    Using artificial intelligence, physicists have compressed a daunting quantum problem that until now requir...

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    Quantum Physics: Record Entanglement of Quantum Memories

    July 7, 2022, Categories  Physics

    © jan greune

    Researchers from LMU and Saarland University have entangled two quantum memories over a 33-kilometer-long fiber optic connection – a record and an important step toward the quantum internet.

    A network in which data transmission is perfectly secure against hacking? If physicists have their way, this will one day become a reality with the help of the quantum mechanical phenomenon known as entanglement. For entangled particles, the rule is: If you measure the state of one of the particles, then you automatically know the state of the other. It makes no difference how far away the entangled particles are from each other. This is an ideal state of affairs for transmitting information over long distances in a way that renders eavesdropping impossible.

    A team led by physic...

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    Quantum Physics sets a Speed Limit to Electronics

    March 28, 2022, Categories  Physics, Technology/Electronics

    An ultra short laser pulse (blue) creates free charge carriers, another pulse (red) accelerates them in opposite directions.

    Semiconductor electronics is getting faster and faster — but at some point, physics no longer permits any increase. The speed can definitely not be increased beyond one petahertz (one million gigahertz), even if the material is excited in an optimal way with laser pulses.

    How fast can electronics be? When computer chips work with ever shorter signals and time intervals, at some point they come up against physical limits. The quantum-mechanical processes that enable the generation of electric current in a semiconductor material take a certain amount of time. This puts a limit to the speed of signal generation and signal transmission.

    TU Wien (Vienna), TU Gra...

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