Lifeboat Foundation

Quantum Entanglement “Fluffy Bunny Style”.

UVM physicist wins NSF CAREER grant to study entanglement 02-08-2016 By Joshua E. Brown Two different ways in which atoms can be quantum entangled. Left: spatial entanglement where atoms in two separated regions share quantum information. Right: particle entanglement for identical atoms (colored here for clarity) due to quantum statistics and interactions.

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What you’re looking at is the first direct observation of an atom’s electron orbital — an atom’s actual wave function! To capture the image, researchers utilized a new quantum microscope — an incredible new device that literally allows scientists to gaze into the quantum realm.

An orbital structure is the space in an atom that’s occupied by an electron. But when describing these super-microscopic properties of matter, scientists have had to rely on wave functions — a mathematical way of describing the fuzzy quantum states of particles, namely how they behave in both space and time. Typically, quantum physicists use formulas like the Schrödinger equation to describe these states, often coming up with complex numbers and fancy graphs.

Up until this point, scientists have never been able to actually observe the wave function. Trying to catch a glimpse of an atom’s exact position or the momentum of its lone electron has been like trying to catch a swarm of flies with one hand; direct observations have this nasty way of disrupting quantum coherence. What’s been required to capture a full quantum state is a tool that can statistically average many measurements over time.

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It has been predicted that particles with imaginary mass, called tachyons, would be able to travel faster than the speed of light. There has not been any experimental evidence for tachyons occurring naturally. Here, we propose how to experimentally simulate Dirac tachyons with trapped ions. Quantum measurement on a Dirac particle simulated by a trapped ion causes it to have an imaginary mass so that it may travel faster than the effective speed of light. We show that a Dirac tachyon must have spinor-motion correlation in order to be superluminal. We also show that it exhibits significantly more Klein tunneling than a normal Dirac particle. We provide numerical simulations of realistic ion systems and show that our scheme is feasible with current technology.

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Physicists have found the most convincing signs of a tetraneutron — a four neutron-no proton particle — to date, adding weight to the possibility that the hypothetical particle really does exist. According to theory, this highly elusive particle cluster is impossible, because of how unstable lone neutrons are, but scientists in Japan say they’ve spotted its signature during recent experiments.

While the results need to be replicated independently before we can truly say the fabled tetraneutron exists, if other teams can confirm its existence, we’re going to have to make some serious changes to current understanding of nuclear forces. “It would be something of a sensation,” nuclear theorist Peter Schuck from France’s National Centre for Scientific Research, who wasn’t involved in the discovery, told Science News.

Physicists have been searching for the tetraneutron for decades, and while this 1965 paper concluded that no evidence could be found and “the existence of tetraneutrons is most unlikely”, four separate papers have since reported experimental observations of the particle.

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Very nice; another article on photonic crystal.

Scientists have created a crystal structure that boosts the interaction between tiny bursts of light and individual electrons, an advance that could be a significant step toward establishing quantum networks in the future.

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We all have “Quantum Spark”.

For centuries philosophers have grappled with the question of what makes life, and thanks to the science of quantum mechanics we might just have the answer, writes Johnjoe McFadden.

What is life? Why is the stuff of life — flesh — so different from inanimate material? Does life obey the same laws as the inanimate world? And what happens when we die?

Continue reading “It seems life really does have a vital spark: quantum mechanics” »

In quantum physics, the creation of a state of entanglement in particles any larger and more complex than photons usually requires temperatures close to absolute zero and the application of enormously powerful magnetic fields to achieve. Now scientists working at the University of Chicago (UChicago) and the Argonne National Laboratory claim to have created this entangled state at room temperature on a semiconductor chip, using atomic nuclei and the application of relatively small magnetic fields.

When two particles, such as photons, are entangled – that is, when they interact physically and are then forcibly separated – the spin direction imparted to each is directly opposite to the other. However, when one of the entangled particles has its spin direction measured, the other particle will immediately display the reverse spin direction, no matter how great a distance they are apart. This is the “spooky action at a distance” phenomenon (as Albert Einstein put it) that has already seen the rise of applications once considered science fiction, such as ultra-safe cryptography and a new realm of quantum computing.

Ordinarily, quantum entanglement is a rarely observed occurence in the natural world, as particles coupled in this way first need to be in a highly ordered state before they can be entangled. In essence, this is because thermodynamic entropy dictates that a general chaos of particles is the standard state of things at the atomic level and makes such alignments exceedingly rare. Going up a scale to the macro level, and the sheer number of particles involved makes entanglement an exceptionally difficult state to achieve.

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Time triva facts that make you go hmmm.

Passage of time is faster for your face than for your feet (supposing you’re standing up). Einstein’s theory of relativity states that the nearer you are to the center of the Earth, the slower time passes – and this has been already measured. For an instance, at the top of Mount Everest, a year would be about 15 microseconds shorter than at sea level.

A second isn’t what just you consider it is. Technically, it’s not defined as 1/60th of a minute, but as “the duration of 9,192,631,770 periods of the radiation consistent to the transition between the two hyperfine levels of the ground state of the caesium 133 atom”.

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It takes 100 attoseconds for a krypton electron to respond to light. That might not seem like much, but someday it could limit the speed of optoelectronic circuits.

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