Viewpoints

Do Quantum Superpositions Have a Size Limit?

Do Quantum Superpositions Have a Size Limit?

January 20, 2015

George C. Knee

An atom’s walk in an optical lattice is used to test a key principle of quantum physics.

Orbital Engineering, By Design

Orbital Engineering, By Design

January 12, 2015

Scott A. Chambers

In transition-metal oxides, the ability to control which atomic orbitals are occupied by electrons could be used to develop materials with new functionalities.

Imaginary Magnetic Fields in the Real World

Imaginary Magnetic Fields in the Real World

January 5, 2015

Nerses Ananikian and Ralph Kenna

Imaginary magnetic fields predicted by the fundamental theory of phase transitions can be realized experimentally.

Diamond Spins Shining Bright

Diamond Spins Shining Bright

December 22, 2014

Guido Burkard

The spin on a silicon defect in diamond can be prepared in a coherent quantum state, a promising sign that it could encode information in a quantum internet.

Synopses

A Black Hole for Polaritons

A Black Hole for Polaritons

January 22, 2015

The flow of hybrid electron-photon states through a black-hole-like “acoustic horizon” may produce an observable signature of Hawking radiation.

How to Spot a WIMP

How to Spot a WIMP

January 21, 2015

A theoretical study outlines the best strategies for identifying weakly interacting massive particles (WIMPs) in dark matter detectors.

It’s All in the Sequence

It’s All in the Sequence

January 15, 2015

The sequence of amino acids in certain biomolecules could be a factor in ensuring that they remain free of knots.

A Cavity Just for Two

A Cavity Just for Two

January 14, 2015

Two groups have independently isolated two atoms in a single cavity and measured that the collective light output is not simply the sum of single emitters.

Focus

Model Demonstrates Cause of Heart Arrhythmia

Model Demonstrates Cause of Heart Arrhythmia

January 16, 2015

A simple model of heart tissue that represents the architecture of cell-cell communication more realistically than previous models spontaneously develops faulty electrical waves that mimic a dangerous heart condition.

Why Language Exceptions Remain the Rule

Why Language Exceptions Remain the Rule

January 9, 2015

Interaction among speakers of a language may explain why frequently used verbs tend to remain irregular even as language evolves over generations.

Notes from the Editors

Notes from the Editors: Highlights of the Year

Notes from the Editors: Highlights of the Year

December 22, 2014

A look back on our favorite stories from 2014.

Announcements

Celebrating the 2015 International Year of Light

Physics revisits six specific advances in the science and technology of light that were reported in the APS journals.


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