Quantum superposition is a phenomenon in which a tiny particle can be in two states at the same time — but only if it is not being directly observed.

Quantum superposition is also used as a tool in quantum computing and is the main reason quantum computers can be so powerful. A classical binary bit can only be in one state at a time: 0 or 1.

Quantum mechanics is tricky for even clever folk to understand, but for today’s Doodle, Google is attempting to illustrate one of its core concepts with what’s hopefully a familiar demonstration.

T he no-go theorem can be tested only if scientists someday invent an AI that’s not just intelligent but capable of being put in a superposition—a requirement that necessitates a quantum computer.

You might also have heard of superposition being explained using Schrödinger’s famous cat paradox. This was a thought experiment proposed by the physicist Erwin Schrödinger, in which a cat is ...

Before we had experiments that revealed how atoms worked, we had no need for superposition, probabilities, measurement or anything else quantum-related. We just had normal physics.

Researchers have created the heaviest system put into superposition yet. The crystal weighs 16 micrograms, or about one-fifth of an eyelash, and has been placed in a quantum state that has been ...