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  • News

    A new spin on guiding sound waves along a one-way route

    An array of miniature turntables could offer a powerful new way to control the flow of sound.

    The proposed device, reported in the March 20 Physical Review Letters, would channel sound waves in a protected one-way thoroughfare along its edge. The structure is an acoustic version of a hotly researched class of...

    03/27/2015 - 15:36 Materials, Physics
  • Science Ticker

    One photon wrangles 3,000 atoms into quantum entanglement

    A particle of light is all it takes to establish a quantum connection between nearly 3,000 atoms, scientists report in the March 26 Nature. The finding brings physicists a step closer to studying the macroscopic effects of quantum entanglement, which...

    03/25/2015 - 14:00 Quantum Physics
  • News

    Quantum links provide clues to causation

    In the quantum world, correlation can imply causation.

    A new experiment using particles of light shows that identifying a simple association between two variables is sufficient to determine whether one influences the other. This process to determine causality, described March 23 in Nature Physics, is surprisingly simple. In...

    03/23/2015 - 12:00 Quantum Physics
  • News

    Finding quantum entanglement in a crowd

    Intricate quantum connections between microscopic particles almost certainly underlie some phenomena perceivable at human scales. Now, for the first time, physicists have measured these connections, known as quantum entanglement, between pairs of photons within a macroscopic beam of light. It’s a step toward understanding how the rules of quantum mechanics scale up to phenomena such as...

    03/16/2015 - 08:00 Quantum Physics
  • News

    Light trick can retrieve missed messages

    SAN ANTONIO — Light may travel at the speed of light, but the information it carries doesn’t have to. Three physicists have proposed a way to receive light-based messages even when the light itself has already flown by.

    The communication technique, detailed March 2 at the March meeting of the American Physical Society and...

    03/05/2015 - 15:18 Quantum Physics
  • News

    Trying to get the down-low on gravity

    A subtle attraction between metallic strips could reveal the theorized but never detected particles that impart gravity.

    An experiment proposed in a Feb. 27 Physical Review Letters paper would explore whether fleeting waves of gravity in a vacuum perceptibly nudge two lead plates together. Detecting this attractive...

    03/02/2015 - 14:45 Quantum Physics, Cosmology
  • News

    Physicists double their teleportation power

    The bandwidth for quantum teleportation has doubled. A new technique transfers information about one particle so that another particle takes on two, rather than just one, of the original particle’s quantum properties.

    Chinese researchers accomplished the feat by nesting one quantum teleportation apparatus inside another. “It’s impressive,” says Wolfgang Tittel, a quantum physicist at the...

    02/25/2015 - 13:00 Quantum Physics
  • News

    The past according to Planck: Cosmologists got a lot right

    A new analysis of the universe’s first light has cosmologists simultaneously patting themselves on the back and scratching on their chalkboards. The results, obtained from the Planck satellite and posted online in February in a set of papers at arXiv.org, largely support the theoretical framework that cosmologists employ to describe the universe...

    02/19/2015 - 08:00 Cosmology, Astronomy
  • News in Brief

    Quantum guessing game uses the future to predict the past

    Predictions are much easier to make with the benefit of hindsight. Scientists successfully predicted an important quantum property midway through an experiment by analyzing measurements taken before and after. The research, scheduled to appear in the Feb. 13 Physical Review Letters, demonstrates that...

    02/13/2015 - 16:48 Quantum Physics
  • Context

    Top 10 messages to send to E.T.

    SAN JOSE, Calif. — Let’s face it. Communicating with aliens isn’t working out any better than persuading creationists to accept evolution. Scientists with the SETI project have been listening for decades, but so far not a peep from E.T. Anyone longing for alien contact has to settle for watching sci-fi movies or Doctor Who.

    Consequently some of science’s alien hunters have...

    02/13/2015 - 16:29 Astronomy