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Physics Encyclopedia Entry 1776335287

** This encyclopedia entry is about the concept of **Quantum Entanglement**, a phenomenon in which particles become connected and can affect each other even when separated by vast distances. ## Overview Quantum Entanglement is a fundamental aspect of **Quantum Mechanics**, the branch of physics that describes the behavior of matter and energy at the smallest scales. It is a phenomenon in which two or more particles become correlated in such a way that the state of one particle cannot be described independently of the others, even when they are separated by large distances. This means that measuring the state of one particle will instantly affect the state of the other entangled particles, regardless of the distance between them. Quantum Entanglement was first proposed by **Albert Einstein** in 1935, as a way to explain the behavior of particles in the context of **Quantum Mechanics**. However, it was not until the 1960s that the phenomenon was experimentally confirmed. Since then, numerous experiments have demonstrated the reality of Quantum Entanglement, including the famous **Aspect Experiment** in 1982, which showed that entangled particles can be connected even when separated by distances of several kilometers. ## History/Background The concept of Quantum Entanglement was first proposed by Albert Einstein, along with **Boris Podolsky** and **Nathan Rosen**, in their 1935 paper "Can Quantum-Mechanical Description of Physical Reality be Considered Complete?" In this paper, they argued that Quantum Mechanics was incomplete, as it did not provide a complete description of physical reality. They proposed the idea of entangled particles, which they called "spooky action at a distance," to demonstrate the limitations of Quantum Mechanics. However, it was not until the 1960s that the phenomenon of Quantum Entanglement was experimentally confirmed. In 1964, **John Bell** proposed a mathematical framework for testing the reality of Quantum Entanglement, which was later experimentally confirmed by **Alain Aspect** in 1982. Since then, numerous experiments have demonstrated the reality of Quantum Entanglement, including the use of entangled particles in quantum computing and quantum cryptography. ## Key Information Quantum Entanglement is a fundamental aspect of Quantum Mechanics, and it has been experimentally confirmed in numerous studies. Some of the key facts about Quantum Entanglement include: - **Entanglement is a non-local phenomenon**: Entangled particles can be connected even when separated by vast distances. - **Entanglement is a fundamental aspect of Quantum Mechanics**: Quantum Entanglement is a consequence of the principles of Quantum Mechanics, and it is not a phenomenon that can be explained by classical physics. - **Entanglement is a resource for quantum computing**: Entangled particles can be used to perform quantum computations that are faster and more powerful than classical computers. - **Entanglement is a key feature of quantum cryptography**: Entangled particles can be used to create secure communication channels that are resistant to eavesdropping. ## Significance Quantum Entanglement is a fundamental aspect of Quantum Mechanics, and it has significant implications for our understanding of the behavior of matter and energy at the smallest scales. Some of the key significance of Quantum Entanglement includes: - **Quantum Entanglement challenges classical notions of space and time**: The phenomenon of Quantum Entanglement challenges our classical notions of space and time, and it has significant implications for our understanding of the nature of reality. - **Quantum Entanglement has applications in quantum computing and cryptography**: Entangled particles can be used to perform quantum computations and create secure communication channels. - **Quantum Entanglement has implications for our understanding of the universe**: Quantum Entanglement has significant implications for our understanding of the universe, including the nature of black holes and the behavior of particles at the smallest scales. INFOBOX: - **Name:** Quantum Entanglement - **Type:** Quantum Mechanical Phenomenon - **Date:** 1935 (proposed by Einstein, Podolsky, and Rosen) - **Location:** Not applicable - **Known For:** Non-local phenomenon that challenges classical notions of space and time TAGS: **Quantum Mechanics**, **Quantum Entanglement**, **Non-locality**, **Quantum Computing**, **Quantum Cryptography**, **Einstein**, **Podolsky**, **Rosen**, **Aspect Experiment**.