Stunning image shows atoms transforming into quantum waves — just as Schrödinger predicted

The image shows the white dots of Lithium atoms cooled to near absolute zero. The red smudges around them represent their wave packets.
The image shows Lithium atoms cooled to near absolute zero appearing as red dots on the image. By combining several of these images, the authors were able to observe atoms behaving like waves. (Image credit: Verstraten et al.)

For the first time ever, physicists have captured a clear image of individual atoms behaving like a wave.

The image shows sharp red dots of fluorescing atoms transforming into fuzzy blobs of wave packets and is a stunning demonstration of the idea that atoms exist as both particles and waves — one of the cornerstones of quantum mechanics

The scientists who invented the imaging technique published their findings on the preprint server arXiv, so their research has not yet been peer reviewed. 

Related: 'Wavy space-time' may explain why gravity won't play by quantum rules

"The wave nature of matter remains one of the most striking aspects of quantum mechanics," the researchers wrote in the paper. They add that their new technique could be used to image more complex systems, giving insights into some fundamental questions in physics.  

First proposed by the French physicist Louis de Broglie in 1924 and expanded upon by Erwin Schrödinger two years later, wave particle duality states that all quantum-sized objects, and therefore all matter, exists as both particles and waves at the same time

Schrödinger's famous equation is typically interpreted by physicists as stating that atoms exist as packets of wave-like probability in space, which are then collapsed into discrete particles upon observation. While bafflingly counterintuitive, this bizarre property of the quantum world has been witnessed in numerous experiments

To image this fuzzy duality, the physicists first cooled lithium atoms to near-absolute zero temperatures by bombarding them with photons, or light particles, from a laser to rob them of their momentum. Once the atoms were cooled, more lasers trapped them within an optical lattice as discrete packets.

With the atoms cooled and confined, the researchers periodically switched the optical lattice off and on — expanding the atoms from a confined near-particle state to one resembling a wave, and then back. 

A microscope camera recorded light emitted by atoms in the particle state at two different times, with atoms behaving like waves in between. By putting together many images, the authors built up the shape of this wave and observed how it expands with time, in perfect agreement with Schrödinger's equation

"This imaging method consists in turning back on the lattice to project each wave packet into a single well to turn them into a particle again — it is not a wave anymore," study co-author Tarik Yefsah, a physicist at the French National Centre for Scientific Research and the École normale supérieure in Paris, told Live Science. "You can see our imaging method as a way to sample the wavefunction density, not unlike the pixels of a CCD camera." A CCD camera is a common type of digital camera that uses a charge-coupled device to capture its images.

The scientists say this image is just a simple demonstration. Their next step will be using it to study systems of strongly interacting atoms that are less well understood.

"Studying such systems could improve our understanding of strange states of matter, such as those found in the core of extremely dense neutron stars, or the quark-gluon plasma that is believed to have existed shortly after the Big Bang," Yefsah said.  

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Ben Turner
Live Science Staff Writer

Ben Turner is a U.K. based staff writer at Live Science. He covers physics and astronomy, among other topics like weird animals and climate change. He graduated from University College London with a degree in particle physics before training as a journalist. When he's not writing, Ben enjoys reading literature, playing the guitar and embarrassing himself with chess.

  • Unclear Engineer
    It would have been helpful if this article had provided a better set of images to demonstrate this research result. After some Google work, I was able to find this , which is not behind a pay wall, and does a better job of explaining the results.
  • Mergatroid
    "which are then collapsed into discrete particles upon observation."
    Are we not seeing them transform into a wave in the image? Is that not observation?
  • Unclear Engineer
    Mergatroid, read the link I provided. It basically says that the waves are inferred from the changes of position of the observed particles from observation to observation. It is a quite complicated experimental process. I have not read it and pondered it long enough to develop an opinion as to whether this is proof, or confirmation bias. Read it and form your own opinion.
  • Classical Motion
    If I'm not hallucinating, this is the same principle of our quantum sensors. As a matter of fact, if I recall, zero temp senors were the very first quantum senors. There are several methods now.

    Today we use rarefied gas in a IC chip, and use laser strobes for alignment instead of zero temps. The unified field of this formation acts like a field blanket. The slightest acceleration applied to any of the amplified all thru out the blanket, allowing detection of much weaker and faster signals that were thought possible.

    In the future it might even be possible to paint a field. Or at least watch a field go thru matter.

    The ripple of the field, will need very fast detection for measurement and recording. Or hold the distortion until recorded.

    After much more refinement, they probably will be stamped out and become very common. Like op amps. Maybe even change the concept of change.

    Far Down Man.
  • danR
    Unclear Engineer said:
    It would have been helpful if this article had provided a better set of images to demonstrate this research result.
    There's certainly nothing "Stunning" about the image chosen, which to most people would represent an optical system struggling with its limits of object-resolution. "Stunning" does serve the purpose of alerting Google's SEO keyword algorithms to something that will generate web-traffic to an article presented by Google News.

    That said, I can't find any image in the paper that graphically represents particle/wave-function of Li atoms in real time; it is, rather, a matter of laboriously parsing images and text and finding a conceptual representation.