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DTN 144: Quantum Navigation Counters GPS Jamming

Plus: SpaceX gears up to go public, the US-trained scientist exodus, chatbots getting high, spying vibrators, and more.

— 5 min read

Quantum navigation could solve the military’s GPS jamming problem

“Several companies, like the US-based Infleqtion, are developing quantum gyroscopes, which track a vehicle's bearing, and quantum accelerometers, which can reveal how far it's traveled. Infleqtion's sensors are based on a technique called atom interferometry: A beam of rubidium atoms is zapped with precise laser pulses, which split the atoms into two separate paths. Later, other laser pulses recombine the atoms, and they're measured with a detector. If the vehicle has turned or accelerated while the atoms are in motion, the two paths will be slightly out of phase in a way the detector can interpret.”

MIT Technology Review

“A 3D-printed Christmas tree made entirely of ice.”

“A team of physicists from the University of Amsterdam's Institute of Physics has 3D-printed a Christmas tree made entirely of ice. Researchers Menno Demmenie, Stefan Kooij and Daniel Bonn used no freezing technology or refrigeration equipment—just water and a vacuum. In time-lapse videos, you can see how the Christmas tree is printed and how it melts again when the vacuum pump is turned off. The work is published on the arXiv preprint server.

The secret of the tree lies in so-called evaporative cooling. This is the same principle mammals use to regulate their body temperature.

In a low-pressure vacuum chamber, water evaporates rapidly at room temperature. As each water molecule evaporates, it takes with it a small amount of heat, causing the remaining water to become increasingly colder, eventually cooling to below 0°C. At that point, the water is still liquid, but supercooled. As soon as the ultra-thin stream (about as thin as a human hair: 16 micrometers) hits the already formed layer of ice, it freezes instantly.” (via Phys.org)

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