Quantum Physics news

UCSB physicists move one step closer to quantum computing

Physics / Quantum Physics

Nov 20, 2009 | 5 / 5 (6) | 0

Physicists at UC Santa Barbara have made an important advance in electrically controlling quantum states of electrons, a step that could help in the development of quantum computing. The work is published ...

JQI researchers create entangled photons from quantum dots

Physics / Quantum Physics

Nov 18, 2009 | 4.3 / 5 (8) | 1

To exploit the quantum world to the fullest, a key commodity is entanglement—the spooky, distance-defying link that can form between objects such as atoms even when they are completely shielded from one another. Now, physicists ...

Rice ties in race for atomic-scale breakthrough

Physics / Quantum Physics

Nov 17, 2009 | 4.7 / 5 (3) | 0

Everybody loves a race to the wire, even when the result is a tie. The great irony is the ultraprecise clocks that could result from this competition could probably break any tie.

Study Shows Time Traveling May Not Increase Computational Power

Physics / Quantum Physics

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. ...

Field experiment on a robust hierarchical metropolitan quantum cryptography network

Physics / Quantum Physics

Oct 16, 2009 | 5 / 5 (1) | 0

Key Laboratory of Quantum Information (CAS), University of Science and Technology of China has recently demonstrated a metropolitan Quantum Cryptography Network (QCN) for Government Administration in Wuhu, China. The project ...

Quantum Computer Chips Now One Step Closer To Reality

Physics / Quantum Physics

Oct 15, 2009 | 4.6 / 5 (16) | 0

In the quest for smaller, faster computer chips, researchers are increasingly turning to quantum mechanics -- the exotic physics of the small. The problem: the manufacturing techniques required to make quantum devices have ...

Quantum-limited Measurement Method for Nanosensors

Physics / Quantum Physics

Oct 14, 2009 | 4.3 / 5 (4) | 0

(PhysOrg.com) -- (PhysOrg.com) -- A team of scientists from the Max Planck Institute of Quantum Optics and the Ludwig Maximilians University have succeeded in applying a novel optical method to nano-mechanical ...

Atomtronic transistor and diode could advance quantum computing

Physics / Quantum Physics

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 ...

Quantum computing may actually be useful, after all

Physics / Quantum Physics

Oct 09, 2009 | 4.6 / 5 (35) | 9

(PhysOrg.com) -- In recent years, quantum computers have lost some of their luster. In the 1990s, it seemed that they might be able to solve a class of difficult but common problems — the so-called NP-complete ...

Physicists Demonstrate Three-Color Entanglement

Physics / Quantum Physics

Oct 07, 2009 | 4.3 / 5 (25) | 3

(PhysOrg.com) -- For the first time, physicists have demonstrated the quantum entanglement of three light beams, all of different wavelengths. Entanglement of two light beams of different wavelengths has already ...

Scientists discover quantum fingerprints of chaos

Physics / Quantum Physics

Oct 07, 2009 | 4.8 / 5 (28) | 1

Chaotic behavior is the rule, not the exception, in the world we experience through our senses, the world governed by the laws of classical physics.

Building a better qubit: Combining 6 photons together results in highly robust qubits

Physics / Quantum Physics

Oct 05, 2009 | 5 / 5 (2) | 0

Exploiting quantum mechanics for transmitting information is a tantalizing possibility because it promises secure, high speed communications. Unfortunately, the fragility of methods for storing and sending ...

Physicists Investigate Unusual Four-Qubit Entanglement

Physics / Quantum Physics

Sep 30, 2009 | 4.6 / 5 (19) | 5

(PhysOrg.com) -- For the first time, physicists have experimentally demonstrated a four-qubit bound-entangled state - a peculiar form of entanglement that cannot be distilled (optimized) by the usual means. ...

Physicists work to understand atomic collisions important to ultracold quantum gasses

Physics / Quantum Physics

Sep 30, 2009 | 4 / 5 (1) | 2

A Kansas State University physicist is continuing his study of atomic collisions with the help of a National Science Foundation grant awarded under the American Recovery and Reinvestment Act.

Physicists Explain How Human Eyes Can Detect Quantum Effects

Physics / Quantum Physics

Sep 29, 2009 | 4.2 / 5 (46) | 19

(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 ...

Physicists make discovery in quantum mechanics

Physics / Quantum Physics

Sep 23, 2009 | 4.3 / 5 (27) | 49

(Santa Barbara, Calif.) -- Physicists at UC Santa Barbara have made an important advance in quantum mechanics using a superconducting electrical circuit. The finding is reported in this week's issue of the journal Nature.

Article examines rare quantum physics effect

Physics / Quantum Physics

Sep 23, 2009 | 4.3 / 5 (25) | 8

(PhysOrg.com) -- There's nothing University of Nebraska-Lincoln physicist Herman Batelaan likes more than a challenge. And there are few areas of science more challenging than working at the sub-atomic, or ...

Diamonds May Be the Ultimate MRI Probe, Say Quantum Physicists

Physics / Quantum Physics

Sep 22, 2009 | 4.5 / 5 (11) | 1

(PhysOrg.com) -- Diamonds, it has long been said, are a girl's best friend. But a research team including a physicist from the National Institute of Standards and Technology has recently found that the gems ...