Latest Basic concepts of quantum mechanics Stories

2010-09-10 04:35:02

Tokyo, Sept 10, 2010 - (JCN Newswire) - Institute for Nano Quantum Information Electronics, The University of Tokyo (Director: Yasuhiko Arakawa), Fujitsu Laboratories Limited, and NEC Corporation today announced that they have achieved quantum cryptographic key distribution(1) at a world-record distance of 50 km using transmission from a single-photon emitter(2). This result was the product of the three-way collaboration between the University of Tokyo, Fujitsu, and NEC, and represents a...

2010-08-12 14:11:56

A new paper by University of Notre Dame physicist Boldizsár Jank³ and colleagues offers an important new understanding of an enduring mystery in chemical physics. More than a century ago, at the dawn of modern quantum mechanics, the Noble Prize-winning physicist Neils Bohr predicted so-called "quantum jumps." He predicted that these jumps would be due to electrons making transitions between discrete energy levels of individual atoms and molecules. Although controversial in Bohr's...

2010-07-27 15:39:09

Uncertainty in the presence of a quantum memory A quantum particle is hard to grasp, because one cannot determine all its properties precisely at the same time. Measurements of certain parameter pairs such as position and momentum remain inaccurate to a degree given by Heisenberg's Uncertainty Principle. This is important for the security of quantum cryptography, where information is transmitted in the form of quantum states such as the polarization of particles of light. A group of...

2010-02-25 14:11:16

Princeton engineers have made a breakthrough in an 80-year-old quandary in quantum physics, paving the way for the development of new materials that could make electronic devices smaller and cars more energy efficient. By reworking a theory first proposed by physicists in the 1920s, the researchers discovered a new way to predict important characteristics of a new material before it's been created. The new formula allows computers to model the properties of a material up to 100,000 times...

2010-02-16 14:10:59

Max Planck physicists develop an experiment to investigate the random motion of quantum particles Life would sometimes be so much easier if we were quantum particles. For example, if we were trying to find our way out of a strange town allowing chance telling us which way to go at every intersection. As objects of classical physics, this would mean becoming more and more lost in the center of the road network. If we were particles that obeyed the laws of quantum mechanics, we would sooner or...

2009-05-11 13:09:07

U.S. scientists say they have created the world's smallest incandescent lamp to explore the boundary between thermodynamics and quantum mechanics. The UCLA researchers said thermodynamics concerns systems with many particles while quantum mechanics works best when applied to just a few. The team is using its tiny lamp to study physicist Max Planck's black-body radiation law, which was derived in 1900 using principles now understood to be native to both theories. The scientists said their...

2009-05-07 10:20:00

Researchers from UCLA have created the world's smallest incandescent lamp in an attempt to better understand how the physics of large things and the physics of invisible things may be related. At just 100 atoms wide, the miniscule lamp's filament is made from a single carbon nanotube that is completely invisible when the lamp is off, but it appears as a tiny point of light when the lamp is turned on. The scientists created a new filament that is 100,000 times narrower and 10,000 times shorter...

2008-07-01 16:10:00

Rice experiment yields closest analog yet for classic atomic model Nearly a century after Danish physicist Niels Bohr offered his planet-like model of the hydrogen atom, a Rice University-led team of physicists has created giant, millimeter-sized atoms that resemble it more closely than any other experimental realization yet achieved. The research is available online in Physical Review Letters. Bohr offered the first successful theoretical model of the atom in 1913, suggesting that electrons...

2008-03-10 16:04:13

Ultracold atoms moving through a carefully designed arrangement of laser beams will jiggle slightly as they go, two NIST scientists have predicted.* If observed, this never-before-seen "jitterbug" motion would shed light on a little-known oddity of quantum mechanics arising from Paul Dirac's 80-year-old theory of the electron. Dirac's theory, which successfully married the principles of Einstein's relativity to the quantum property of electrons known as spin, famously predicted that the...

2005-11-04 18:00:00

In the macroscopic world of everyday life we often have 'deterministic chaos'. Events like weather and ocean currents, the movement of heavenly bodies, or the growth of insect populations can all be described in exact formulas. They are indeed 'deterministic'. But the way they proceed in reality is highly sensitive to initial values. Even the smallest failure to measure the initial conditions can make a long-term prediction impossible. Physicists call such systems 'chaotic'. Microscopic...

Word of the Day
  • A spider.
  • Figuratively, a peevish, testy, ill-natured person.
'Attercop' comes from the Old English 'atorcoppe,' where 'atter' means 'poison, venom' and‎ 'cop' means 'spider.' 'Coppa' is a derivative of 'cop,' top, summit, round head, or 'copp,' cup, vessel, which refers to 'the supposed venomous properties of spiders,' says the OED. 'Copp' is still found in the word 'cobweb.'