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Physics

Why John Stewart Bell has been haunting quantum mechanics for decades

The “Bell test” was devised in the 1960s to uncover what’s going on in the quantum world, but it continues to be relevant today, says Karmela Padavic-Callaghan

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Quantum computer circuitry illustration. Conventional computers store information as 'bits', with each transistor holding either a 1 or a 0. Quantum computers use quantum bits, or qubits, which operate according to two principles of quantum physics. One of the principles, supposition, allows a qubit to store a 1 and a 0 at the same time. This means two qubits can hold four values at once. The second principle, entanglement, means that the state of one qubit can depend on the state of another. As you expand the number of qubits, the machine becomes exponentially more powerful.

Physics

Quantum theory at 100: Let’s celebrate its power and provocation

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Where exactly does the quantum world end and concrete reality begin?

Physics

Where exactly does the quantum world end and concrete reality begin?

Features

Could the ancient Greeks have invented quantum theory?

Physics

Could the ancient Greeks have invented quantum theory?

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What does quantum theory really tell us about the nature of reality?

Physics

What does quantum theory really tell us about the nature of reality?

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How a quantum innovation may quash the idea of the multiverse

Physics

How a quantum innovation may quash the idea of the multiverse

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Physics

Physicists in 2024 searched the quantum realm for the truth about time

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Physics

Quantum time crystals could be used to store energy

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Physics

Indestructible quantum rifts can exist in two places at once

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Physics

Quantum theory is challenging long-standing ideas about entropy

A mathematical study finds that three definitions of what it means for entropy to increase, which have previously been considered equivalent, can produce different results in the quantum realm

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Physics

Certain quantum systems may be able to defy entropy's effects forever

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Space

We’ve just doubled the number of gravitational waves we can find

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Physics

Our reality seems to be compatible with a quantum multiverse

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Physics

Cause and effect may not actually be muddled in the quantum realm

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