Almost a century ago, German physicist Werner Heisenberg realized the laws of quantum mechanics placed some fundamental limits on how accurately we can measure certain properties of microscopic objects. However, the laws of quantum mechanics can also offer ways to make measurements more accurate than would otherwise be possible. In new research published in Nature ...
In Einstein’s theory of general relativity, gravity arises when a massive object distorts the fabric of space-time the way a ball sinks into a piece of stretched cloth. Solving Einstein’s equations by using quantities that apply across all space and time coordinates could enable physicists to eventually find their ‘white whale’: a quantum theory of ...
Topology and entanglement are two powerful principles for characterizing the structure of complex quantum states. In a new paper in the journal Physical Review X, researchers from the University of Pennsylvania established a relationship between the two. Charles Kane, the Christopher H. Browne Distinguished Professor of Physics in Penn’s School of Arts & Sciences, said: “Our work ties ...
Tiny crystals, known as quantum dots, have enabled an international team to achieve a quantum efficiency exceeding 100 percent in the photocurrent generated in a hybrid inorganic-organic semiconductor. Perovskites are exciting semiconductors for light-harvesting applications and have already shown some impressive performances in solar cells. But improvements in photo-conversion efficiency are necessary to take this ...
A roadmap for the future direction of quantum simulation has been set out in a paper co-authored at the University of Strathclyde. Quantum computers are hugely powerful devices with a capacity for speed and calculation which is well beyond the reach of classical, or binary, computing. Instead of a binary system of zeroes and ones, ...
Lancaster researchers have developed a camera-like device able to image mini whirlpools, quantum vortices, in quantum liquids for the first time ever. Vortices form in stirred fluids when water drains into a plughole and can also be seen in tornadoes and cyclones. Quantum vortices always have the same size These vortices are unpredictable, unlike in ...
As physicists delve deeper into the quantum realm, they are discovering an infinitesimally small world composed of a strange and surprising array of links, knots, and winding. Some quantum materials exhibit magnetic whirls called skyrmions — unique configurations described as “subatomic hurricanes.” Others host a form of superconductivity that twists into vortices. Now, in an ...
It’s not every day that someone comes across a new state of matter in quantum physics, the scientific field devoted to describing the behavior of atomic and subatomic particles in order to elucidate their properties. However, a new quantum state of matter has been observed for the first time. Yet this is exactly what an ...
Quantum particles have very special properties. Very recently, researchers led by Markus Aspelmeyer at the University of Vienna and Lukas Novotny at ETH Zurich cooled a glass nanoparticle into the quantum regime for the first time. To do this, the particle is deprived of its kinetic energy with the help of lasers. What remains are ...
An international team of researchers out of Macquarie University in Sydney, Australia, has demonstrated a new approach for converting ordinary laser light into genuine quantum light. Their approach uses nanometer-thick films made of gallium arsenide, which is a semiconductor material widely used in solar cells. They sandwich the thin films between two mirrors to manipulate ...
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