A Telegraph Through a Hidden Tunnel in Time
Two couriers leave the same city in opposite directions. An hour later, each opens an envelope: one contains a slip marked “plus,” the other “minus.” How did they know who would get which?
Quantum Conductor: Entangled Photons Take the Concert Stage
In September 2024, the concert hall in Linz had more than just an orchestra on stage. Next to the musicians, a setup was generating pairs of entangled photons: a laser with a wavelength of 405 nm passed through a nonlinear crystal and split into two photons at 810 nm, which flew off to two measurement stations, Alice and Bob.
Quantum Link Through 62 Kilometers of Air
Two photons, like two halves of the same coin, fly tens of kilometers apart but remain linked: measure one, and you instantly know the state of the other. This property is called entanglement, and it underpins quantum communication.
Quantum Magic of Heavy Particles
At the Large Hadron Collider, by accelerating particles to nearly light speeds, top quarks are created — the heaviest building blocks of the Standard Model. They live for vanishingly small fractions of a second but manage to exhibit complex quantum connections.
Quantum Telepathy: Coordination Without Signals or Delays
Imagine two particles that behave as if they share a telepathic link: measuring one instantly determines the state of the other — at any distance.
Comparing Scents: A New Type of Bell Inequalities
Comparing two scents is easy even without knowing their ingredients, just tell if they're alike. This everyday principle became the foundation for a new class of Bell inequalities, reimagining tests of the spooky connection between particles. Previously, you had to measure precise properties, like spin direction, but the authors showed that simply comparing outcomes is enough.
Entangled Photons: A New Way to See the Invisible
Entangled photons are like two couriers marching in lockstep: their quantum states, particularly polarization, are synchronized so that measuring one instantly determines the state of the other, even at a distance. In a material, this synchronization gets disrupted.
The Secret Link Between Past and Future in the Quantum World: A Model with Backward Time
A typical recipe explains how to cook a dish: step by step, from the initial ingredients to the finished result. The new approach flips the logic: imagine that the future pie itself dictates how much flour to add now. In the quantum world, researchers suggest, a particle receives signals from the future measurement outcome.
Quantum Clocks for the Infant Universe
A photographer tries to capture light interference, but has only one lens and the ability to change exposure time. A similar challenge faces cosmologists studying quantum imprints in the cosmic microwave background — the afterglow of the Big Bang.
One Neuron, One Memory: Inequalities to Unlock Brain Secrets
Neurons communicate via electrical impulses. For a long time, their behavior was described by the standard model: after each firing, the cell completely 'forgets' the past, like a car that screeches to a halt the moment you kill the engine. But what if a neuron is more like a car that coasts on its own momentum?
Quantum Debate: What Are Particles Hiding?
Two particles behave like a pair of unusual dice: thrown at opposite ends of the universe, they always land on the same face. Physicist John Stewart Bell calculated: if the dice had hidden rules, the frequency of matches would have a strict limit.
Quantum Games Crack a Classic Math Theorem
In 1953, mathematician Alexander Grothendieck proved a theorem that became a cornerstone in the theory of tensor products. It states that for ordinary function spaces, two natural norms, the projective and the injective, are equivalent up to a universal constant. In other words, two ways of measuring the 'size' of combinations of vectors give similar results.
The Bell of Noncommutativity: How Twisted Statistics Violate Bell Inequalities
Two observers, Alice and Bob, sit at opposite ends of the same lab. Between them is a source that fires off two pulses in turn. Each pulse gives birth to a wave packet flying toward its own detector. So far, this looks like an ordinary experiment with quantum particles.
Quantum Dance Without a Shared Stage
Two dancers on the same stage mirror each other's moves even when a curtain separates them. In the quantum world, such pairs are called entangled, and physicists have spent half a century probing how far this connection reaches. Until now, all tests with massive particles concerned their internal properties, such as spin, but not their motion itself.