Link to paper mentioned in article.

On Sat, Jun 23, 2018 at 2:31 PM H LV <> wrote:

> My comment: The article explains that the boost to energy storage rapidly
> descreases as the number of entangled particles in a system increases, but
> what counts as a system? If a nucleus or an atom is a system of small
> number of particles perhaps they are capable of storing more energy under
> the right circumstances than was previously thought possible.
> Harry
> Synopsis: Putting Quantum Systems to Work
> October 22, 2015
> Quantum effects such as coherence and entanglement increase a system’s
> ability to store energy.
> Engines in cars and airplanes are thermal machines that are capable of
> doing work. Scientists have recently demonstrated the existence of
> so-called quantum thermal machines, tiny versions of engines and
> refrigerators consisting of only a few quantum-mechanical units. When
> calculating how much work such microscopic systems can accomplish, quantum
> effects such as coherence and entanglement must be taken into account. Now,
> researchers have shown that systems in which quantum effects are pronounced
> can store more energy than systems that are purely classical.
> Antonio Acín at the Institute of Photonic Sciences, Spain, and co-workers
> studied how isolated ensembles of nnquantum particles could optimally store
> usable energy. The researchers imagined a set of correlated particles at
> the same temperature. These particles are useless individually—one cannot,
> for example, run a thermal machine without a temperature gradient—but
> correlations among them can be exploited for extracting work. Acín and his
> colleagues theoretically demonstrated that entangled states can store more
> energy than nonentangled states. However, this advantage vanishes as the
> number of particles increases. For example, small ensembles of entangled
> particles (n=2n=2) stored 100% more energy than purely classical particles;
> for n=50n=50 the quantum advantage reduced to only 2%. This finding
> supports the hypothesis that thermodynamics on a macroscopic scale is
> insensitive to the underlying microscopic mechanics. The team now plans to
> study how different kinds of entanglement affect energy storage.
> This research is published in Physical Review X.
> –Katherine Kornei
> ​
> ​-------​

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