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Physics Encyclopedia Entry 1782810210

** This entry is about the concept of **Quantum Entanglement**, a fundamental phenomenon in **Quantum Mechanics** that describes the interconnectedness of particles at a subatomic level. ## Overview Quantum Entanglement is a mysterious and fascinating phenomenon in which two or more particles become correlated in such a way that their properties are connected, regardless of the distance between them. This means that measuring the state of one particle instantly affects the state of the other entangled particles, even if they are separated by vast distances. This phenomenon has been extensively studied and experimentally confirmed, and it has far-reaching implications for our understanding of the behavior of matter and energy at the quantum level. Quantum Entanglement is a key feature of **Quantum Mechanics**, a branch of physics that describes the behavior of particles at the atomic and subatomic level. In classical physics, particles are considered to be independent and separate entities, but in quantum mechanics, particles can become entangled in a way that transcends space and time. This phenomenon has been observed in a wide range of systems, from photons and electrons to atoms and even large-scale objects like superconducting circuits. ## History/Background The concept of Quantum Entanglement was first proposed by Albert Einstein, Boris Podolsky, and Nathan Rosen in 1935, as a thought experiment to challenge the principles of Quantum Mechanics. They argued that if Quantum Mechanics was correct, then it would be possible to create a situation in which two particles were correlated in such a way that measuring the state of one particle would instantly affect the state of the other, regardless of the distance between them. This idea was later developed and refined by other physicists, including Erwin Schrödinger, who coined the term "entanglement" in 1935. The first experimental evidence for Quantum Entanglement was provided by John Bell in 1964, who showed that entangled particles could be used to test the principles of Quantum Mechanics. Since then, numerous experiments have confirmed the existence of Quantum Entanglement, including the famous Aspect experiment in 1982, which demonstrated the phenomenon in a laboratory setting. ## Key Information Quantum Entanglement is a fundamental property of Quantum Mechanics, and it has been extensively studied and experimentally confirmed. Some of the key features of Quantum Entanglement include: * **Non-locality**: Entangled particles can be separated by vast distances, and yet their properties remain correlated. * **Instantaneous communication**: Measuring the state of one entangled particle instantly affects the state of the other, regardless of the distance between them. * **Quantum superposition**: Entangled particles can exist in multiple states simultaneously, which is a fundamental property of Quantum Mechanics. * **Entanglement swapping**: Entangled particles can be used to create a chain of entangled particles, which can be used for quantum communication and computation. ## Significance Quantum Entanglement has far-reaching implications for our understanding of the behavior of matter and energy at the quantum level. Some of the key significance of Quantum Entanglement includes: * **Quantum computing**: Entangled particles can be used to create quantum gates, which are the building blocks of quantum computers. * **Quantum communication**: Entangled particles can be used to create secure communication channels, which are resistant to eavesdropping and hacking. * **Quantum cryptography**: Entangled particles can be used to create secure cryptographic keys, which can be used to encrypt and decrypt sensitive information. * **Fundamental understanding**: Quantum Entanglement provides a fundamental understanding of the behavior of matter and energy at the quantum level, which is essential for the development of new technologies and our understanding of the universe. INFOBOX: - Name: Quantum Entanglement - Type: Quantum Phenomenon - Date: 1935 (first proposed by Einstein, Podolsky, and Rosen) - Location: Not applicable - Known For: Interconnectedness of particles at a subatomic level TAGS: Quantum Mechanics, Quantum Entanglement, Non-locality, Instantaneous Communication, Quantum Superposition, Entanglement Swapping, Quantum Computing, Quantum Communication, Quantum Cryptography, Fundamental Understanding.