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Jul 17, 2017
Quantum back-action-evading measurement of motion in a negative mass reference frame
Posted by Andreas Matt in category: quantum physics
Interesting…
Quantum mechanics dictates that a continuous measurement of the position of an object imposes a random quantum back-action (QBA) perturbation on its momentum. This randomness translates with time into position uncertainty, thus leading to the well known uncertainty on the measurement of motion1, 2. As a consequence of this randomness, and in accordance with the Heisenberg uncertainty principle, the QBA3, 4 puts a limitation—the so-called standard quantum limit—on the precision of sensing of position, velocity and acceleration. Here we show that QBA on a macroscopic mechanical oscillator can be evaded if the measurement of motion is conducted in the reference frame of an atomic spin oscillator6, 7. The collective quantum measurement on this hybrid system of two distant and disparate oscillators is performed with light. The mechanical oscillator is a vibrational ‘drum’ mode of a millimetre-sized dielectric membrane, and the spin oscillator is an atomic ensemble in a magnetic field9, 10. The spin oriented along the field corresponds to an energetically inverted spin population and realizes a negative-effective-mass oscillator, while the opposite orientation corresponds to an oscillator with positive effective mass. The QBA is suppressed by −1.8 decibels in the negative-mass setting and enhanced by 2.4 decibels in the positive-mass case. This hybrid quantum system paves the way to entanglement generation and distant quantum communication between mechanical and spin systems and to sensing of force, motion and gravity beyond the standard quantum limit.
Benjamin Vidmar is the founder of Polar Permaculture and he’s trying to do the impossible: grow vegetables in the harsh landscape of Svalbard, a group of Norwegian islands in the Arctic Ocean.
Jul 17, 2017
Jeff Bezos: reusable rockets will let a trillion people colonise the solar system
Posted by Klaus Baldauf in category: space travel
America must go back to the Moon, build a Moon-base, then humanity should colonise the solar system. Why? So life on Earth can continue, says Amazon and Blue Origin supremo Jeff Bezos.
Jul 16, 2017
Scientists Upload a Galloping Horse GIF Into Bacteria With Crispr
Posted by Shailesh Prasad in category: biotech/medical
DNA could be a robust storage system for data, but never before have researchers stored information in a live organism.
Jul 16, 2017
How to hack your gut to ward off Parkinson’s and obesity
Posted by Dan Kummer in categories: biotech/medical, neuroscience
The wonder of your gut: Experts explain why a healthy digestive system can trigger weight loss, fight depression, and ward off Parkinson’s.
- Jasenka Zubcevic works in Physiological Sciences, and Christopher Martynuik in Toxicology at the University of Florida
- They have been investigating how gut bacteria affect all other body parts
- Here they explain everything we know thus far about the gut
By Jasenka Zubcevic and Christopher Martynuik For The Conversation
Continue reading “How to hack your gut to ward off Parkinson’s and obesity” »
https://www.youtube.com/watch?v=6YHIdaxDTxY&feature=share
Dr. Vita-More is an expert in the culture of emerging technology and humanity’s continued evolution.
Jul 16, 2017
OMNI Magazine Back in Print This Fall — By Stubby the Rocket | Tor.com
Posted by Odette Bohr Dienel in categories: innovation, media & arts, science
Jul 16, 2017
Scientists reverse ageing in mammals and predict human trials within 10 years
Posted by Montie Adkins in category: life extension
Salk Institute. 4 genes.
A n end to grey hair and crows-feet could be just 10 years away after scientists showed it is possible to reverse ageing in animals.
Using a new technique which takes adult cells back to their embryonic form, US researchers at the Salk Institute in California, showed it was possible to reverse ageing in mice, allowing the animals to not only look younger, but live for 30 per cent longer.
Continue reading “Scientists reverse ageing in mammals and predict human trials within 10 years” »