A fresh math perspective opens new possibilities for computational chemistry

A new mathematical “shortcut” is speeding up molecular absorption calculations by a factor of five, so simulations that used to take 10 to 15 hours to compute can now be done in approximately 2.5 hours.

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Discoveries Fuel Fight Over Universe’s First Light

A series of observations at the very edge of the universe has reignited a debate over what lifted the primordial cosmic fog. …

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Nanophysics: Saving energy with a spot of silver

Tomorrow’s computers will run on light, and gold nanoparticle chains show much promise as light conductors. Now scientists have demonstrated how tiny spots of silver could markedly reduce energy consumption in light-based computation.

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Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits — or qubits — that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

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Testing quantum field theory in a quantum simulator

Quantum field theories are often hard to verify in experiments. Now, there is a new way of putting them to the test. Scientists have created a quantum system consisting of thousands of ultra cold atoms. By keeping them in a magnetic trap on an atom chip, this atom cloud can be used as a ‘quantum simulator’, which yields new insights into some of the most fundamental questions of physics.

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A Defense of the Reality of Time

Time isn’t just another dimension, argues Tim Maudlin. To make his case, he’s had to reinvent geometry. …

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Quantum reservoir for microwaves

Researchers use a mechanical micrometer-size drum cooled close to the quantum ground state to amplify microwaves in a superconducting circuit.

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Why Quantum Computers Might Not Break Cryptography

A new paper claims that a common digital security system could be tweaked to withstand attacks even from a powerful quantum computer. …

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