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Quantum mechanics

A theory that works perfectly and nobody can agree what it means.

44: briefs
2: subjects
11:00: average
484 min: in total

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science.briefs Science

All 40 in science →

9:52

Klaus von Klitzing

A single number, RK, turned resistance into a quantum ruler — but it measures only one kind of perfection.

9:49

Albert Einstein

Einstein didn’t prove relativity — he rebuilt physics from scratch using pens, paper and postulates.

13:00

Alain Aspect's early 1980s photon experiments turned Einstein's decades-old discomfort with entanglement into a testable question, and quantum mechanics won, though it took another three decades of closing loopholes before the answer became fully conclusive.

13:00

Bell's theorem

Bell's theorem drew a hard line between quantum mechanics and local hidden variables, and fifty years of Bell tests, from Aspect's photons to the loophole-free experiments of 2015, keep landing on the quantum side.

13:00

Compton scattering

In 1922 Arthur Compton found that scattered X-rays came back with a longer wavelength than the ones he sent in, a shift that depended only on angle, and the only explanation that fit was that light was hitting electrons as discrete particles.

10:34

David Gross

Asymptotic freedom isn’t just clever math — it’s why we can ever see quarks at all.

13:00

Matter wave

Louis de Broglie's 1924 claim that matter behaves like a wave, tested first on electrons and later on molecules weighing tens of thousands of daltons, has held at every scale physicists have managed to test it.

9:28

Dirac equation

Paul Dirac

The Dirac equation is the first consistent relativistic quantum wave equation. It predicts antimatter and derives spin — verified by hydrogen fine structure and Anderson’s 1932 positron detection. It does not prove antimatter; it implies it. It does not go beyond first-order fine structure. It remains indispensable in particle physics.

technology.briefs Technology

All 4 in technology →

9:28

Quantum computing

Quantum computing is not a faster computer—it’s a different kind of calculator, built for problems classical machines were never meant to solve.

9:55

Quantum network

Quantum networks are not a new internet — they’re a fragile, meter-scale lab technique pretending to be infrastructure.

10:01

Laser

Theodore Maiman · 1960

Theodore Maiman’s 1960 laser is a milestone in quantum electronics—not because it launched applications, but because it proved coherence could be engineered in a solid, at room temperature, using flashlamp excitation. Its limitations are structural: three-level pumping demands high peak power and prevents continuous operation. Its success lies in specificity: 694 nm, pulsed, ruby, May 16, Malibu.

10:39

Semiconductor

Semiconductors aren’t magic—they’re doped crystals whose usefulness begins only when quantum physics meets deliberate impurity placement.