Phys.org news tagged with:heisenberg uncertainty principle
http://phys.org/
en-usPhys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.Researchers nearly reach quantum limit with nanodrumsExtremely accurate measurements of microwave signals can potentially be used for data encryption based on quantum cryptography and other purposes.
http://phys.org/news/2016-10-quantum-limit-nanodrums.html
Nanophysics Mon, 31 Oct 2016 09:00:03 ESTnews397120895New technique could improve angular resolution of telescopes beyond the diffraction limitThe angular resolution of a telescope is the smallest angle between two objects that still can be resolved as separate things; in a telescope with high angular resolution, those objects can be very close together and yet still appear distinct.
http://phys.org/news/2016-07-technique-angular-resolution-telescopes-diffraction.html
Optics & Photonics Wed, 06 Jul 2016 07:06:09 ESTnews387007560The role of statistics in quantum scale observation explains microscale behaviourThere is a gap in the theory explaining what is happening at the macroscopic scale, in the realm of our everyday lives, and at the quantum level, at microscopic scale. In this paper published in EPJ D , Holger Hofmann from the Graduate School of Advanced Sciences of Matter at Hiroshima University, Japan, reveals that the assumption that quantum particles move because they follow a precise trajectory over time has to be called into question. Instead, he claims that the notion of trajectory is a dogmatic bias inherited from our interpretation of everyday experience at the macroscopic scale. The paper shows that trajectories only emerge at the macroscopic limit, as we can neglect the complex statistics of quantum correlations in cases of low precision.
http://phys.org/news/2016-06-role-statistics-quantum-scale-microscale.html
Quantum Physics Tue, 07 Jun 2016 08:30:07 ESTnews384506429Experimental test verifies Heisenberg's measurement uncertainty principle(Phys.org)—Werner Heisenberg originally proposed the uncertainty principle in 1927, but his original proposal was somewhat different than how it is interpreted today. As a recent paper in Physical Review Letters explains, Heisenberg's original statement was about error and disturbance in a measurement process. Over the years, however, Heisenberg's original proposal has been restated in terms of the uncertainties intrinsic to quantum states. This aspect of the uncertainty principle has been studied extensively with well-developed theories and verified experimentally.
http://phys.org/news/2016-06-experimental-heisenberg-uncertainty-principle.html
Quantum Physics Thu, 02 Jun 2016 09:40:02 ESTnews384076227Theorists smooth the way to modeling quantum frictionTheoretical chemists at Princeton University have pioneered a strategy for modeling quantum friction, or how a particle's environment drags on it, a vexing problem in quantum mechanics since the birth of the field. The study was published in the Journal of Physical Chemistry Letters.
http://phys.org/news/2016-05-theorists-smooth-quantum-friction.html
Quantum Physics Mon, 16 May 2016 13:05:24 ESTnews382622717'Zeno effect' verified—atoms won't move while you watchOne of the oddest predictions of quantum theory – that a system can't change while you're watching it – has been confirmed in an experiment by Cornell physicists. Their work opens the door to a fundamentally new method to control and manipulate the quantum states of atoms and could lead to new kinds of sensors.
http://phys.org/news/2015-10-zeno-effect-verifiedatoms-wont.html
Quantum Physics Fri, 23 Oct 2015 06:44:22 ESTnews364801453ORNL reports method that takes quantum sensing to new levelThermal imaging, microscopy and ultra-trace sensing could take a quantum leap with a technique developed by researchers at the Department of Energy's Oak Ridge National Laboratory.
http://phys.org/news/2015-04-ornl-method-quantum.html
Optics & Photonics Thu, 23 Apr 2015 14:41:06 ESTnews349018848Best of Last Week – Setting a quantum speed limit, slowing the speed of light and turning back the aging clock(Phys.org)—It was a very busy week for physics research. A team of scientists has set a quantum speed limit—the group at the University of California found a way to prove a fundamental relationship between energy and time, the flip side of the Heisenberg uncertainty principle. And researchers at MIT unveiled a new analysis that shows a way to self-propel subatomic particles—it is one of the new ways scientists have found to "trick" the traditional laws of physics. Another was demonstrated by a team of physicists at the University of Glasgow as they found a new way to slow the speed of light—by running a laser beam through a mask causing a change in the shape of photons. Meanwhile, another combined team of researchers in Europe found a way to demonstrate that atoms can be in two places at the same time—they pulled an atom in two directions at once, giving a hint that quantum mechanics may hold for large objects.
http://phys.org/news/2015-01-week-quantum-limit-aging-clock.html
Other Mon, 26 Jan 2015 08:50:01 ESTnews341483673Scientists set quantum speed limitUniversity of California, Berkeley, scientists have proved a fundamental relationship between energy and time that sets a "quantum speed limit" on processes ranging from quantum computing and tunneling to optical switching.
http://phys.org/news/2015-01-scientists-quantum-limit.html
Quantum Physics Thu, 22 Jan 2015 15:26:51 ESTnews341162791Discovery of uncertainty relations beyond the HeisenbergIn the quantum world, the famous Heisenberg uncertainty principle bounds the product of the variances of two incompatible observables such as the position and the momentum of a particle by the Planck constant. Heisenberg, one of the founders of quantum mechanics, gave only an intuitive formulation of this principle, using thought experiments. Later, the uncertainty relation was generalized by Robertson for general observables and it was proved that the product of the variances of two incompatible observables is bounded by their commutator (a quantity that gives the difference between two physical observables when multiplied in succession).
http://phys.org/news/2015-01-variances-heisenberg-incompatible.html
Quantum Physics Mon, 05 Jan 2015 05:53:53 ESTnews339659592Tricking the uncertainty principle(Phys.org) —Caltech researchers have found a way to make measurements that go beyond the limits imposed by quantum physics.
http://phys.org/news/2014-05-uncertainty-principle.html
Quantum Physics Thu, 15 May 2014 18:15:22 ESTnews319396501Proving uncertainty: First rigorous formulation supporting Heisenberg's famous 1927 principleNearly 90 years after Werner Heisenberg pioneered his uncertainty principle, a group of researchers from three countries has provided substantial new insight into this fundamental tenet of quantum physics with the first rigorous formulation supporting the uncertainty principle as Heisenberg envisioned it.
http://phys.org/news/2014-04-uncertainty-rigorous-heisenberg-famous-principle.html
Quantum Physics Tue, 29 Apr 2014 11:53:38 ESTnews317991201A bound on the natural width of the Higgs bosonCMS has improved the constraints on the Higgs width, a fundamental property of this unique new particle, by more than two orders of magnitude.
http://phys.org/news/2014-04-bound-natural-width-higgs-boson.html
General Physics Wed, 02 Apr 2014 06:56:47 ESTnews315640594Researchers use squeezed light to enhance photonic force microscopy(Phys.org) —A team of researchers working in Australia has used "squeezed light" to enhance the sharpness of images produced using photonic force microscopy. In their paper published in Physical Review Letters, the team describes how they applied a property of quantum mechanics to microscopy to offer resolution enhancement of up to 14 percent.
http://phys.org/news/2014-02-photonic-microscopy.html
Optics & Photonics Thu, 20 Feb 2014 11:10:02 ESTnews312114325Researchers use quantum entanglement to improve differential interference contrast microscopy(Phys.org)—A team of researchers with members from Hokkaido and Osaka Universities in Japan has used quantum entanglement of photons to improve image results created using differential interference contrast microscopy. In their paper published in Nature Communications, the team describes how they used entangled photons to enhance an image taken of an etched (to a depth of just 17 nanometers) letter "Q" on a glass plate, and how much improvement was observed.
http://phys.org/news/2014-02-quantum-entanglement-differential-contrast-microscopy.html
Quantum Physics Tue, 11 Feb 2014 08:30:01 ESTnews311324177Research team challenges the limits of famous quantum principle(Phys.org) —A team of physicists is challenging the very limits of Heisenberg's famous uncertainty principle by measuring quantum particles with unprecedented accuracy.
http://phys.org/news/2014-02-team-limits-famous-quantum-principle.html
Quantum Physics Wed, 05 Feb 2014 07:30:05 ESTnews310806836Teleportation just got easier—but not for you, unfortunatelyThanks to two studies published in Nature last Thursday, the chance of successful teleportation has considerably increased. Which is a good thing, right?
http://phys.org/news/2013-08-teleportation-easierbut.html
Quantum Physics Wed, 21 Aug 2013 08:01:37 ESTnews296290882Hydrogen atoms under the magnifying glassTo describe the microscopic properties of matter and its interaction with the external world, quantum mechanics uses wave functions, whose structure and time dependence is governed by the Schrödinger equation. In atoms, electronic wave functions describe - among other things - charge distributions existing on length-scales that are many orders of magnitude removed from our daily experience. In physics laboratories, experimental observations of charge distributions are usually precluded by the fact that the process of taking a measurement changes a wave function and selects one of its many possible realizations. For this reason, physicists usually know the shape of charge distributions through calculations that are shown in textbooks. That is to say, until now. An international team coordinated by researchers from the Max Born Institute has succeeded in building a microscope that allows magnifying the wave function of excited electronic states of the hydrogen atom by a factor of more than twenty-thousand, leading to a situation where the nodal structure of these electronic states can be visualized on a two-dimensional detector.
http://phys.org/news/2013-05-hydrogen-atoms-magnifying-glass.html
Quantum Physics Wed, 22 May 2013 08:50:03 ESTnews288430300Curves in spacetime violate Heisenberg's uncertainty principle(Phys.org)—If an object traveling through spacetime can loop back in time in a certain way, then its trajectory can allow a pair of its components to be measured with perfect accuracy, violating Heisenberg's uncertainty principle. This new finding involves a particular trajectory called an open timelike curve (OTC), which is a special case of a closed timelike curve (CTC), a theoretical concept that has previously provoked controversy because it raises the possibility of traveling backwards in time.
http://phys.org/news/2013-02-spacetime-violate-heisenberg-uncertainty-principle.html
Quantum Physics Tue, 19 Feb 2013 09:00:01 ESTnews280404720Researchers demonstrate Heisenberg uncertainty principle at macro level(Phys.org)—Physicists working at the University of Colorado have succeeded in demonstrating one of the major tenets of quantum mechanics—namely the Heisenberg uncertainty principle—at the macro level. In their paper published in the journal Science, the team describes how a small but still visible drum they built in their lab, outfitted with mirrors, a laser and a detector, demonstrated that it was not possible to measure a photon's position and momentum simultaneously.
http://phys.org/news/2013-02-heisenberg-uncertainty-principle-macro.html
Quantum Physics Fri, 15 Feb 2013 07:30:01 ESTnews280128966Physicists extend entanglement in Einstein experiment(Phys.org)—Using a photon fission process, physicists have split a single photon into a pair of daughter photons and then split one of the daughter photons into a pair of granddaughters to create a total of three photons. All three photons, the scientists showed, share quantum correlations between their energies (corresponding to their momentums) and between their emission times (corresponding to their positions). The study marks the first experimental demonstration of energy-time entanglement of three or more individual particles, building on the original two-particle version proposed by Einstein, Podolsky, and Rosen (EPR) 77 years ago.
http://phys.org/news/2012-12-physicists-entanglement-einstein.html
Quantum Physics Thu, 06 Dec 2012 09:10:02 ESTnews274001995More certainty on uncertainty's quantum mechanical roleScientists who study the ultra-small world of atoms know it is impossible to make certain simultaneous measurements, for example finding out both the location and momentum of an electron, with an arbitrarily high level of precision. Because measurements disturb the system, increased certainty in the first measurement leads to increased uncertainty in the second. The mathematics of this unintuitive concept – a hallmark of quantum mechanics – were first formulated by the famous physicist Werner Heisenberg at the beginning of the 20th century and became known as the Heisenberg Uncertainty Principle. Heisenberg and other scientists later generalized the equations to capture an intrinsic uncertainty in the properties of quantum systems, regardless of measurements, but the uncertainty principle is sometimes still loosely applied to Heisenberg's original measurement-disturbance relationship. Now researchers from the University of Toronto have gathered the most direct experimental evidence that Heisenberg's original formulation is wrong.
http://phys.org/news/2012-10-certainty-uncertainty-quantum-mechanical-role.html
Quantum Physics Thu, 04 Oct 2012 11:35:20 ESTnews268569309Scientists score one more victory over uncertainty in quantum physics measurements(PhysOrg.com) -- Most people attempt to reduce the little uncertainties of life by carrying umbrellas on cloudy days, purchasing automobile insurance or hiring inspectors to evaluate homes they might consider purchasing. For scientists, reducing uncertainty is a no less important goal, though in the weird realm of quantum physics, the term has a more specific meaning.
http://phys.org/news/2012-02-scientists-score-victory-uncertainty-quantum.html
Quantum Physics Sun, 26 Feb 2012 13:00:01 ESTnews249480424Heisenberg Uncertainty Principle sets limits on Einstein's 'spooky action at a distance,' new research findsResearchers have uncovered a fundamental link between the two defining properties of quantum physics. Stephanie Wehner of Singapore's Centre for Quantum Technologies and the National University of Singapore and Jonathan Oppenheim of the United Kingdom's University of Cambridge published their work today in the latest edition of the journal Science.
http://phys.org/news/2010-11-heisenberg-uncertainty-principle-limits-einstein.html
Quantum Physics Thu, 18 Nov 2010 14:19:58 ESTnews209312379Physicists detect entanglement of one photon shared among four locationsScientists at the California Institute of Technology (Caltech) have developed an efficient method to detect entanglement shared among multiple parts of an optical system. They show how entanglement, in the form of beams of light simultaneously propagating along four distinct paths, can be detected with a surprisingly small number of measurements. Entanglement is an essential resource in quantum information science, which is the study of advanced computation and communication based on the laws of quantum mechanics.
http://phys.org/news/2009-05-physicists-entanglement-photon.html
General Physics Fri, 08 May 2009 18:38:40 ESTnews161026685