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Quantum Computers

Physicists demonstrate a four-fold quantum memory

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TechAndComputer (Nov. 20, 2010) — Researchers at the California Institute of Technology (Caltech) have demonstrated quantum entanglement for a quantum state stored in four spatially distinct atomic memories.

Their work, described in the November 18 issue of the journal Nature, also demonstrated a quantum interface between the atomic memories -- which represent something akin to a computer "hard drive" for entanglement -- and four beams of light,...

TechAndComputer (Nov. 20, 2010) — Researchers at the California Institute of Technology (Caltech) have demonstrated quantum entanglement for a quantum state stored in four spatially distinct atomic memories.

Their work, described in the November 18 issue of the journal Nature, also...

All-optical transistor: Controling the flow of light with a novel optical transistor

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TechAndComputer (Nov. 12, 2010) — In an article appearing on Nov. 11 in the journal Science, researchers at EPFL and the Max Planck Institute of Quantum Optics announce the discovery of a method for coupling photons and mechanical vibrations that could have numerous applications in telecommunications and quantum information technologies.

Controlling and modulating the flow of light is essential in today's telecommunications-based society....

TechAndComputer (Nov. 12, 2010) — In an article...

Braided anyons could lead to more robust quantum computing

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TechAndComputer (Nov. 2, 2010) — When confined to a 2-dimensional sheet, some exotic particle-like structures known as anyons appear to entwine in ways that could lead to robust quantum computing schemes, according to research appearing in the Nov. 1 issue of the journal Physical Review B.

The physicists at Bell Laboratories who performed the research are hopeful the anyons can be induced to follow paths that twist into braids that would be much...

TechAndComputer (Nov. 2, 2010) — When...

Breakdown of correlated tunneling

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TechAndComputer (Oct. 29, 2010) — Quantum systems do often behave differently from what we would expect intuitively and from our daily experience. One example is provided by the so-called Landau-Zener problem. It describes e.g. the tunneling of a quantum particle between two potential wells with an initial difference in potential energy that is gradually reversed over time. The Russian physicist Lew Landau and the American physicist Clarence...

TechAndComputer (Oct. 29, 2010) — Quantum...

Changing the color of single photons emitted by quantum dots

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TechAndComputer (Oct. 15, 2010) — Researchers at the National Institute of Standards and Technology (NIST) have demonstrated for the first time the conversion of near-infrared 1,300 nm wavelength single photons emitted from a true quantum source, a semiconductor quantum dot, to a near-visible wavelength of 710 nm. The ability to change the color of single photons may aid in the development of hybrid quantum systems for applications in quantum...

TechAndComputer (Oct. 15, 2010) —...