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Physics Encyclopedia Entry 1777027566

** This encyclopedia 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 mind-bending concept in **Physics** that has left scientists and philosophers alike scratching their heads for decades. At its core, Entanglement is a phenomenon where two or more particles become connected in such a way that their properties, such as **Spin**, **Polarization**, and **Energy**, become correlated, regardless of the distance between them. This means that if something happens to one particle, it instantly affects the other, even if they are separated by vast distances. Entanglement is a key feature of **Quantum Mechanics**, a branch of **Physics** that studies the behavior of matter and energy at the smallest scales. The concept of 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 Entanglement was real, it would imply the existence of **Spooky Action at a Distance**, a phenomenon that seemed to defy the fundamental principles of **Relativity**. However, subsequent experiments have consistently confirmed the existence of Entanglement, and it has become a cornerstone of **Quantum Information Science**. ## History/Background The concept of Entanglement has its roots in the early 20th century, when **Max Planck** introduced the concept of **Quantum Mechanics**. In the 1920s and 1930s, **Niels Bohr**, **Werner Heisenberg**, and **Erwin Schrödinger** developed the mathematical framework of **Quantum Mechanics**, which described the behavior of particles in terms of **Wave Functions** and **Probabilities**. However, it wasn't until the 1960s and 1970s that Entanglement began to gain attention as a fundamental aspect of **Quantum Mechanics**. One of the key experiments that confirmed the existence of Entanglement was the **EPR Paradox**, proposed by Einstein, Podolsky, and Rosen in 1935. The experiment involved two particles, one with a **Spin Up** and the other with a **Spin Down**, which were separated by a large distance. If the particles were not entangled, the spin of one particle would be independent of the spin of the other. However, if they were entangled, the spin of one particle would be correlated with the spin of the other, even if they were separated by vast distances. ## Key Information Some of the key facts about Entanglement include: * **Quantum Entanglement** is a fundamental phenomenon in **Quantum Mechanics** that describes the interconnectedness of particles at a subatomic level. * Entanglement is a **Non-Locality** phenomenon, meaning that it allows for instantaneous communication between particles, regardless of the distance between them. * Entanglement is a **Quantum Correlation**, meaning that the properties of entangled particles are correlated, regardless of the distance between them. * Entanglement is a key feature of **Quantum Information Science**, which has led to the development of **Quantum Computing**, **Quantum Cryptography**, and **Quantum Teleportation**. ## Significance Entanglement has far-reaching implications for our understanding of the universe and the laws of **Physics**. It has been shown to be a fundamental aspect of **Quantum Mechanics**, and has led to the development of new technologies, such as **Quantum Computing** and **Quantum Cryptography**. Entanglement has also been used to demonstrate the **Non-Locality** of the universe, which challenges our understanding of **Space** and **Time**. INFOBOX: - Name: Quantum Entanglement - Type: **Quantum Phenomenon** - Date: 1935 (EPR Paradox) - Location: **Subatomic Level** - Known For: **Non-Locality** and **Quantum Correlation** TAGS: **Quantum Mechanics**, **Quantum Entanglement**, **Non-Locality**, **Quantum Correlation**, **Quantum Computing**, **Quantum Cryptography**, **Quantum Teleportation**, **EPR Paradox**