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posted by Fnord666 on Sunday August 27 2023, @01:55AM   Printer-friendly
from the little-light-reading dept.

Arthur T Knackerbracket has processed the following story:

Since the 17th century, when Isaac Newton and Christiaan Huygens first debated the nature of light, scientists have been puzzling over whether light is best viewed as a wave or a particle—or perhaps, at the quantum level, even both at once. Now, researchers at Stevens Institute of Technology have revealed a new connection between the two perspectives, using a 350-year-old mechanical theorem—ordinarily used to describe the movement of large, physical objects like pendulums and planets—to explain some of the most complex behaviors of light waves.

The work, led by Xiaofeng Qian, assistant professor of physics at Stevens and reported in the August 17 online issue of Physical Review Research, also proves for the first time that a light wave's degree of non-quantum entanglement exists in a direct and complementary relationship with its degree of polarization. As one rises, the other falls, enabling the level of entanglement to be inferred directly from the level of polarization, and vice versa. This means that hard-to-measure optical properties such as amplitudes, phases and correlations—perhaps even these of quantum wave systems—can be deduced from something a lot easier to measure: light intensity.

"We've known for over a century that light sometimes behaves like a wave, and sometimes like a particle, but reconciling those two frameworks has proven extremely difficult," said Qian "Our work doesn't solve that problem—but it does show that there are profound connections between wave and particle concepts not just at the quantum level, but at the level of classical light-waves and point-mass systems."

Qian's team used a mechanical theorem, originally developed by Huygens in a 1673 book on pendulums, that explains how the energy required to rotate an object varies depending on the object's mass and the axis around which it turns. "This is a well-established mechanical theorem that explains the workings of physical systems like clocks or prosthetic limbs," Qian explained. "But we were able to show that it can offer new insights into how light works, too."

[...] "Essentially, we found a way to translate an optical system so we could visualize it as a mechanical system, then describe it using well-established physical equations," explained Qian.

Journal information:
More information: Xiao-Feng Qian et al, Bridging coherence optics and classical mechanics: A generic light polarization-entanglement complementary relation, Physical Review Research (2023). DOI: 10.1103/PhysRevResearch.5.033110

Journal information: Physical Review Research

PDF available at https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.5.033110. [Added by JR 29/08/23 at 08:39 UTC]


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  • (Score: 1, Insightful) by Anonymous Coward on Sunday August 27 2023, @01:01PM (3 children)

    by Anonymous Coward on Sunday August 27 2023, @01:01PM (#1322061)

    TFA needs something like one additional paragraph to say exactly what they demonstrated. It is frustratingly thin on description. Unfortunately the journal article abstract is very hand-waive-y too and I can't access the journal paper. This is the best you get out of the abstract:

    More surprisingly, through the barycentric coordinate system, optical polarization, entanglement, and their identity relation are shown to be quantitatively associated with the mechanical concepts of center of mass and moment of inertia via the Huygens-Steiner theorem for rigid body rotation.

    • (Score: 3, Informative) by Mojibake Tengu on Sunday August 27 2023, @02:53PM (1 child)

      by Mojibake Tengu (8598) on Sunday August 27 2023, @02:53PM (#1322072) Journal
      --
      Respect Authorities. Know your social status. Woke responsibly.
      • (Score: 2) by Mojibake Tengu on Sunday August 27 2023, @03:04PM

        by Mojibake Tengu (8598) on Sunday August 27 2023, @03:04PM (#1322073) Journal

        I kept trying my identification skills on the clock. It tells time, but it never told me what time is...
              -- daimona Salvos

        Seriously, it's all about rotating pendulums, like photons or planets.

        --
        Respect Authorities. Know your social status. Woke responsibly.
    • (Score: 2) by janrinok on Tuesday August 29 2023, @08:37AM

      by janrinok (52) Subscriber Badge on Tuesday August 29 2023, @08:37AM (#1322248) Journal

      https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.5.033110

      Did you try downloading the PDF? It works for me.

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