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Added: 2026-06-03

[00:00:05]Physicists in Copenhagen have cracked a 60-year-old [music] quantum code.

[00:00:11]They had to create their own world to do it.

[00:00:15]>> [music] >> For six decades, physicists have puzzled over the mysterious quantum states [music] hidden within superconducting vortices.

[00:00:24]These elusive [music] phenomena occurred at such minute energy levels that for years [music] they seemed virtually impossible to directly observe.

[00:00:34]No available research [music] instruments were sensitive enough to detect them, rendering the problem intractable. [music] The breakthrough came from an unexpected source.

[00:00:46]Instead of continuing fruitless attempts at direct detection, a team from the Niels Bohr Institute at the University of Copenhagen [music] adopted a completely new strategy.

[00:00:59]Led by [music] Professor Søren Vasegaard Olesen, the team set out to create their own material systems that replicated the key conditions [music] for these enigmatic states.

[00:01:10]This ingenious shift in approach [music] proved key to solving the problem.

[00:01:16]The theory of quantum states in superconducting [music] vortices emerged in the 1960s, but for decades thereafter it remained [music] purely hypothetical.

[00:01:27]The main obstacle was the aforementioned [music] extremely low energy levels, which prevented observation.

[00:01:34]Only the unconventional approach of [music] Danish researchers provided a solution.

[00:01:40]As Vasegaard [music] Olesen explains, building their own research platform allowed [music] for the observation of analogous phenomena under controlled conditions.

[00:01:51]This gave scientists the ability to manipulate [music] the experimental parameters.

[00:01:58]The heart of the solution turned out to be a semiconductor [music] superconducting platform, a technology developed in Copenhagen [music] about a decade ago.

[00:02:09]The researchers constructed a miniature [music] superconducting cylinder and then applied magnetic flux to reproduce key physical phenomena.

[00:02:19]The entire [music] process was akin to finding an alternative path to a seemingly [music] insoluble problem.

[00:02:27]This method circumvented fundamental limitations of previous research.

[00:02:31][music] In practice, the team performed tunneling spectroscopy of Andreev subgap [music] states in specially designed nanowires.

[00:02:43]These hybrid structures consist of a semiconducting core surrounded by a superconducting shell.

[00:02:49]>> [music] >> Under these conditions, they were able to observe analogs of the states naturally [music] occurring in upper cutoff vortices in type two superconductors.

[00:03:00]>> [music] >> Of particular significance was the discovery that these analogs manifest as one-dimensional van [music] Hove singularities whose energy spacing is comparable to the superconducting gap.

[00:03:15]The most important feature [music] of these artificially created states is their independence from the Fermi energy, which makes them much easier to observe [music] than the original phenomena.

[00:03:27]This property was key to the success of the entire endeavor.

[00:03:32]>> [music] >> Interestingly, as Veit Kinast admits, the discovery was partially [music] accidental. Researchers stumbled upon these states during experiments.

[00:03:43]Nevertheless, [music] their potential applications seem significant, though this should be approached [music] with caution.

[00:03:51]The new states could be used to build hybrid quantum simulators, essential for [music] studying complex materials of the future.

[00:04:00]This is a significant step in the development of quantum technologies.

[00:04:05]Although it will likely take [music] some time before they translate into practical implementations.

[00:04:12]The semiconductor [music] superconductor platform, a Copenhagen invention from a [music] decade ago, has once again proven its versatility.

[00:04:22]It can be used to study a variety of quantum [music] states, paving the way for further discoveries.

[00:04:29]The Danish breakthrough closes a 60-year [music] chapter in quantum physics, while simultaneously opening up new avenues of research.

[00:04:39]>> [music] >> It also demonstrates how a creative approach to a scientific impasse can lead to unexpected solutions, even when a problem [music] seems insoluble.

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