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Quantum communication: Each photon counts

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he single-photon detector is characterized by five convincing factors: 91% detection efficiency; direct integration on chip; counting rates on a Gigahertz scale; high timing resolution and negligible dark counting rates. (Credit: Source: KIT/CFN)

Jan. 25, 2013 — Ultrafast, efficient, and reliable single-photon detectors are among the most sought-after components in photonics and quantum communication, which have not yet reached maturity for practical application. Physicist Dr. Wolfram Pernice of the Karlsruhe Institute of Technology (KIT), in cooperation with colleagues at Yale University, Boston University, and Moscow State Pedagogical University, achieved the decisive breakthrough by integrating single-photon...

Quantum States Between Order and Disorder

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Jan. 23, 2013 — With his research on quantum states in the realm between order and disorder, Professor Jörg Schmiedmayer's work has raised quite a stir; ultra cold atom clouds with a high degree of order approach a disordered thermal equilibrium. During this transition they spend some time in an astonishingly stable intermediate state. With a new ERC Grant, Schmiedmayer will now dig deeper into the physics of non-equilibrium phenomena in many-particle quantum systems.

How do...

Investigating the bystander effect using virtual reality

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Animated environment for the simulation. (Credit: Image courtesy of Bournemouth University)

Jan. 11, 2013 — The bystander effect is well-known in behavioural psychology and suggests that the more people who witnessing a violent emergency the less likely it is that someone will intervene. It was first identified in the 1960s, but conducting research on the phenomenon has been difficult. Most experiments rely upon staging fake emergencies or violent encounters using...

New design for basic component of computer chips: Researchers demonstrate record-setting p-type transistor

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In this micrograph of an experimental transistor, blue highlighting indicates areas of "strain," where germanium atoms have been forced closer together than they find comfortable. One of the reasons for the transistor's record-setting performance is that the strain has been relaxed in the lateral direction. (Credit: Winston Chern and James Teherani)

Jan. 3, 2013 — Almost all computer chips use two types of transistors: one called p-type, for positive, and one called...

Engineers develop new energy-efficient computer memory using magnetic materials

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MeRAM bit. (Credit: Image courtesy of University of California - Los Angeles)

Dec. 14, 2012 — By using electric voltage instead of a flowing electric current, researchers from UCLA's Henry Samueli School of Engineering and Applied Science have made major improvements to an ultra-fast, high-capacity class of computer memory known as magnetoresistive random access memory, or MRAM.

The UCLA team's improved memory, which they call MeRAM for magnetoelectric...