Physicists bring a Once-Theoretical Effect of Quantum Matter into Observable Reality

The Weld Lab’s quantum boomerang showed a lithium atom’s initial departure and return to average zero momentum despite periodic energy “kicks” from their quantum kicked rotor
Photo Credit: 
ROSHAN SAJJAD

Physicists at UC Santa Barbara have become the first to experimentally observe a quirky behavior of the quantum world: a “quantum boomerang” effect that occurs when particles in a disordered system are kicked out of their locations. Instead of landing elsewhere as one might expect, they turn around and come back to where they started and stop there.

“It’s really a fundamentally quantum mechanical effect,” said atomic physicist David Weld, whose lab produced the effect and documented it in a paper published in Physical Review X. “There’s no classical explanation for this phenomenon.”

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Death Spiral: A Black Hole Spins on its Side

Researchers from the University of Turku, Finland, found that the axis of rotation of a black hole in a binary system is tilted more than 40 degrees relative to the axis of stellar orbit. The finding challenges current theoretical models of black hole formation.

The observation by the researchers from Tuorla Observatory in Finland is the first reliable measurement that shows a large difference between the axis of rotation of a black hole and the axis of a binary system orbit. The difference between the axes measured by the researchers in a binary star system called MAXI J1820+070 was more than 40 degrees.

Often for the space systems with smaller objects orbiting around the central massive body, the own rotation axis of this body is to a high degree aligned with the rotation axis...

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Scientists reveal the Mechanism of Skeletal Muscle Stem Cell Activation in Muscle Regeneration

Discordant proteomic and transcriptomic signatures reveal a potential translational control mechanism during the SC quiescence-to-activation transition. a Schematic illustration of the workflow for the proteomic analysis of FACS-isolated SCs. The SCs were sorted from Pax7-nGFP mice. QSCs were sorted from 0.5% PFA-perfused mice. fiSCs were sorted from unperfused mice. Injured ASCs (iASCs) were sorted from 3 days 1.2% BaCl2 injured mice. Cultured ASCs (cASCs) were 2 days cultured SCs. (n = 2 independent experiments). b Hierarchical clustering of the protein expression (in the number of spectra) for QSCs, fiSCs, iASCs, and cASCs. c Heatmap of representative expression for cell cycle, quiescence, and activation-specific proteins of QSCs, fiSCs, iASCs, and cASCs...
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Novel Design greatly Improves Output from Commercial Circuit Boards next to Superconducting Qubits

Green commercial circuit boards—the largest is 11.4 cm (4.5 in) by 19 cm (7.5  in)—inside a dilution refrigerator. When enclosed and pumped down, the system reaches temperatures only a few thousandths of a degree above absolute zero. Credit: NIST

Researchers at the National Institute of Standards and Technology (NIST) have constructed and tested a system that allows commercial electronic components—such as microprocessors on circuit boards—to operate in close proximity with ultracold devices employed in quantum information processing. That design allows 4X as much data to be output for the same number of connected wires.

In the rising excitement about quantum computing, it can be easy to overlook the physical fact that the data produced by manipulation of quantum bits (qubit...

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