Physics News

MATHUSLA—a new idea proposed to spot long-lived particles at LHC

General Physics - 木, 05/24/2018 - 09:37
A small team of physicists that includes Jessie Shelton of the University of Illinois and David Curtin of the University of Toronto has written a paper and presented it at this year's American Physical Society meeting outlining a possible way to detect particles emitted from the Large Hadron Collider. Their idea involves constructing a new building near the LHC to house a suite of long-lived particle detectors.
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Using the K computer, scientists predict exotic "di-Omega" particle

General Physics - 木, 05/24/2018 - 07:48
Based on complex simulations of quantum chromodynamics performed using the K computer, one of the most powerful computers in the world, the HAL QCD Collaboration, made up of scientists from the RIKEN Nishina Center for Accelerator-based Science and the RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) program, together with colleagues from a number of universities, have predicted a new type of "dibaryon"—a particle that contains six quarks instead of the usual three. Studying how these elements form could help scientists understand the interactions among elementary particles in extreme environments such as the interiors of neutron stars or the early universe moments after the Big Bang.
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Nuclear physicists leap into quantum computing with first simulations of atomic nucleus

Quantum Physics News - 水, 05/23/2018 - 12:53
Scientists at the Department of Energy's Oak Ridge National Laboratory are the first to successfully simulate an atomic nucleus using a quantum computer. The results, published in Physical Review Letters, demonstrate the ability of quantum systems to compute nuclear physics problems and serve as a benchmark for future calculations.
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How can you tell if a quantum memory is really quantum?

Quantum Physics News - 水, 05/23/2018 - 09:30
Quantum memories are devices that can store quantum information for a later time, which are usually implemented by storing and re-emitting photons with certain quantum states. But often it's difficult to tell whether a memory is storing quantum or merely classical information. In a new paper, physicists have developed a new test to verify the quantum nature of quantum memories.
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OPERA collaboration presents its final results on neutrino oscillations

General Physics - 火, 05/22/2018 - 11:53
The OPERA experiment, located at the Gran Sasso Laboratory of the Italian National Institute for Nuclear Physics (INFN), was designed to conclusively prove that muon-neutrinos can convert to tau-neutrinos, through a process called neutrino oscillation, whose discovery was awarded the 2015 Nobel Physics Prize. In a paper published today in the journal Physical Review Letters, the OPERA collaboration reports the observation of a total of ten candidate events for a muon to tau-neutrino conversion, in what are the very final results of the experiment. This demonstrates unambiguously that muon neutrinos oscillate into tau neutrinos on their way from CERN, where muon neutrinos were produced, to the Gran Sasso Laboratory 730km away, where OPERA detected the ten tau neutrino candidates.
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The price of chaos: A new model virtually pits new investors against experienced ones

General Physics - 火, 05/22/2018 - 11:22
Financial investing attracts a range of casual neophytes to Wall Street financiers. Variation in expertise and risk-taking behaviors among investors regularly sends markets on roller-coaster rides. Most existing economic theories cannot account for this variability, but new research in chaos theory looks to help us to understand the human factors behind investing.
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Tech 'Nobel' awarded to Finnish physicist for small smart devices

General Physics - 火, 05/22/2018 - 11:15
Finnish materials physicist Tuomo Suntola, who developed a groundbreaking technology to reduce the size of complex devices, on Tuesday won Finland's take on the Nobel science prizes.
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Tunable diamond string may hold key to quantum memory

Quantum Physics News - 火, 05/22/2018 - 11:00
A quantum internet promises completely secure communication. But using quantum bits or qubits to carry information requires a radically new piece of hardware—a quantum memory. This atomic-scale device needs to store quantum information and convert it into light to transmit across the network.
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Neutrons by the numbers—New counting technique delivers unprecedented accuracy

General Physics - 火, 05/22/2018 - 08:48
After years of research, scientists at the National Institute of Standards and Technology (NIST) have developed and demonstrated a way to count the absolute number of neutrons in a beam that is four times more accurate than their best previous results, and 50 times more accurate than similar measurements anywhere else in the world.
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A better way to control crystal vibrations

General Physics - 月, 05/21/2018 - 16:10
The vibrational motion of an atom in a crystal propagates to neighboring atoms, which leads to wavelike propagation of the vibrations throughout the crystal. The way in which these natural vibrations travel through the crystalline structure determine fundamental properties of the material. For example, these vibrations determine how well heat and electrons can traverse the material, and how the material interacts with light.
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Quantum effects observed in photosynthesis

Quantum Physics News - 月, 05/21/2018 - 11:00
Molecules that are involved in photosynthesis exhibit the same quantum effects as non-living matter, concludes an international team of scientists including University of Groningen theoretical physicist Thomas la Cour Jansen. This is the first time that quantum mechanical behavior was proven to exist in biological systems that are involved in photosynthesis. The interpretation of these quantum effects in photosynthesis may help in the development of nature-inspired light-harvesting devices. The results were published in Nature Chemistry on 21 May.
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Turning entanglement upside down

Quantum Physics News - 月, 05/21/2018 - 11:00
A team of physicists from ICTP-Trieste and IQOQI-Innsbruck has come up with a surprisingly simple idea to investigate quantum entanglement of many particles. Instead of digging deep into the properties of quantum wave functions, which are notoriously hard to experimentally access, they propose to realize physical systems governed by the corresponding entanglement Hamiltonians. By doing so, entanglement properties of the original problem of interest become accessible via well-established tools.
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Stronger-than-binary correlations experimentally demonstrated for the first time

Quantum Physics News - 月, 05/21/2018 - 09:30
For the first time, physicists have experimentally demonstrated ternary—rather than binary—quantum correlations between entangled objects. The results show that the quantum measurement process cannot be described as a binary process (having two possible outcomes), but rather stronger-than-binary ternary measurements (which have three possible outcomes) should be considered in order to fully understand how the quantum measurement process works.
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Diamond 'spin-off' tech could lead to low-cost medical imaging and drug discovery tools

General Physics - 金, 05/18/2018 - 16:20
It may sound contradictory, but diamonds are the key to a new technique that could provide a very-low-cost alternative to multimillion-dollar medical imaging and drug-discovery devices.
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Magnonic interferometer paves way toward energy-efficient information processing devices

General Physics - 金, 05/18/2018 - 11:10
Researchers have designed an interferometer that works with magnetic quasiparticles called magnons, rather than photons as in conventional interferometers. Although magnon signals have discrete phases that normally cannot be changed continuously, the magnonic interferometer can generate a continuous change of the magnon signal. In the future, this ability could be used to design magnonic integrated circuits and other magnonic devices that overcome some of the limitations facing their electronic counterparts.
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Robotic assembly of the world's smallest house—even a mite doesn't fit through the door

General Physics - 金, 05/18/2018 - 10:23
A French nanorobotics team from the Femto-ST Institute in Besançon, France, assembled a new microrobotics system that pushes forward the frontiers of optical nanotechnologies. Combining several existing technologies, the μRobotex nanofactory builds microstructures in a large vacuum chamber and fixes components onto optical fiber tips with nanometer accuracy. The microhouse construction, reported in the Journal of Vacuum Science and Technology A, demonstrates how researchers can advance optical sensing technologies when they manipulate ion guns, electron beams and finely controlled robotic piloting.
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