Quantum Entanglement
Quantum entanglement is a fundamental phenomenon in quantum mechanics where two or more particles become correlated in such a way that the quantum state of each particle cannot be described independently of the others, even when separated by large distances. This leads to instantaneous correlations between measurements on entangled particles, famously described by Einstein as 'spooky action at a distance'. It is a key resource for quantum technologies like quantum computing, cryptography, and teleportation.
Developers should learn about quantum entanglement when working in quantum computing, quantum information science, or advanced cryptography, as it underpins quantum algorithms (e.g., in quantum error correction and quantum key distribution) and enables protocols like quantum teleportation. It is essential for understanding quantum hardware (e.g., qubit interactions in quantum processors) and for developing applications in secure communication and simulation of quantum systems.