Physicists achieve first entangled measurement of W states – Physics World

Breakthrough in Quantum Entanglement

Physicists in Japan have achieved the first entangled measurement of W states, a phenomenon that could pave the way for robust quantum communication and scalable networks.

Quantum entanglement is a state where two particles are interconnected, allowing the measurement of one particle to reveal information about the other, even if they are light-years apart.

This phenomenon is the foundation of technologies such as quantum cryptography and quantum computing.

A team of physicists has performed a collective quantum measurement on a W state comprising three entangled photons, allowing them to analyse the photons at once rather than one at a time.

Author's summary: Japanese physicists achieve breakthrough in quantum entanglement measurement.

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Physics World Physics World — 2025-10-14