News tagged with review letters
Nanoimaging in 3-D
Dec 01, 2009 |
4.9 / 5 (12) |
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(PhysOrg.com) -- As technology shrinks ever smaller, interest in objects and devices on the nanoscale becomes more apparent. However, visualizing these objects in three dimensions comes with special challenges. ...
Creating a six-qubit cluster state
Nov 02, 2009 |
4.6 / 5 (10) |
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(PhysOrg.com) -- Many scientists believe that quantum entanglement is required in order for effective quantum computing. Entanglement takes place when there is a connection that exists between two objects - even when they ...
Study Shows Time Traveling May Not Increase Computational Power
Oct 22, 2009 |
4.1 / 5 (26) |
5
(PhysOrg.com) -- For more than 50 years, physicists have been intrigued by the concept of closed time-like curves (CTCs). Because a CTC returns to its starting point, it raises the possibility of traveling backward in time. ...
Running electronics using light
Oct 19, 2009 |
4.3 / 5 (19) |
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(PhysOrg.com) -- "If you open up almost any electronic gadget, you will see various elements that operating using electric circuitries," Nader Engheta tells PhysOrg.com. "Many of them have different functi ...
How Perfect Can Graphene Be?
Nanotechnology / Nanomaterials
Oct 13, 2009 |
4.6 / 5 (30) |
5
(PhysOrg.com) -- Physicists have investigated the purest graphene to date, and have found that the material possesses unprecedented high electronic quality. The discovery has raised the bar for this relatively ...
Atomtronic transistor and diode could advance quantum computing
Oct 09, 2009 |
4.6 / 5 (24) |
5
(PhysOrg.com) -- What if atoms could be used to perform the functions currently the province of electronic devices? The goal of atomtronics is to do just that by creating analogues to the common items found in electronic ...
Physicists Explain How Human Eyes Can Detect Quantum Effects
Sep 29, 2009 |
4.2 / 5 (46) |
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(PhysOrg.com) -- By greatly amplifying one photon from an entangled photon pair, physicists have theoretically shown that human eyes can be used as detectors to observe quantum effects. Usually, detecting ...
Superheavy Element 114 Confirmed: A Stepping Stone to the Island of Stability
Sep 24, 2009 |
4.5 / 5 (37) |
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(PhysOrg.com) -- Scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory have been able to confirm the production of the superheavy element 114, ten years after a group in Russia, ...
Broadband invisibility in the microwave range
Sep 11, 2009 |
3.9 / 5 (10) |
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(PhysOrg.com) -- In the series Star Trek, Klingons and Romulans have spaceships outfitted with cloaking devices that hide their presence from sight, as well as from the sensors of their rivals' spaceships. Unlike current invisi ...
Proposed Quantum Computer Consists of Billions of Electron Spins
Sep 09, 2009 |
4.5 / 5 (26) |
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(PhysOrg.com) -- While researchers have already demonstrated the building blocks for few-bit quantum computers, scaling these systems up to large quantum computers remains a challenge. One of the biggest problems ...
Renewable Energy Made by Mixing Salt and Fresh Water
Sep 02, 2009 |
4.3 / 5 (27) |
6
(PhysOrg.com) -- When a river flows into the sea, the location is more than just a haven for water commerce. The mixing of fresh and salt water that occurs at an estuary also dissipates energy, as the different ...
Physicist Proposes Solution to Arrow-of-Time Paradox
Aug 27, 2009 |
4.2 / 5 (73) |
108
(PhysOrg.com) -- Entropy can decrease, according to a new proposal - but the process would destroy any evidence of its existence, and erase any memory an observer might have of it. It sounds like the plot ...
New interferometer could simplify materials research
Aug 13, 2009 |
5 / 5 (13) |
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(PhysOrg.com) -- “Most current hard x-ray interferometers are based on crystals, which require their high quality and high mechanical stability,” Anatoly Snigirev tells PhysOrg.com. “This can make x-ray interferometry quite ...
Why Does Water Expand When it Cools? A New Explanation
Jul 17, 2009 |
4.2 / 5 (39) |
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(PhysOrg.com) -- Most of us, when we take our first science classes, learn that when things cool down, they shrink. (When they heat up, we learn, they usually expand.) However, water seems to be the exception ...
Transform a ball into a rock -- or make it invisible -- using transformation optics
Jul 09, 2009 |
3.2 / 5 (13) |
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(PhysOrg.com) -- Science fiction and fantasy tales are full of the ability to "cloak" characters with invisibility. Whether it is a spaceship with a cloaking device, or a young wizard with an invisibility ...
