What is Quantum Entanglement?
thequantuminsider.com May 11, 2026

What is Quantum Entanglement?

AI-summarised brief · reviewed before publication

Quantum entanglement is a real and measurable feature of quantum mechanics where correlated quantum states are affected by measuring one particle, regardless of distance. Experiments have confirmed entanglement, which underpins technologies like quantum computing and quantum cryptography. Albert Einstein initially called it "spooky action at a distance" in 1935, but decades of experiments have proven it to be a verified feature of quantum mechanics. Entanglement occurs when particles interact, forming a single quantum system with correlated states. China's Micius satellite demonstrated entanglement in 2017, distributing entangled photons over 1,200 kilometers. Entanglement has moved from a philosophical puzzle to a practical resource, forming the basis of emerging quantum networks and technologies.

💡 Why It Matters

  • · Quantum entanglement's confirmation challenges Einstein's principle of local realism, forcing a reevaluation of the fundamental principles of physics.
  • · Its practical applications in quantum computing and cryptography also rely on this phenomenon, making it a crucial component of emerging technologies.