Today, Admin UjjaL is spending his time with Quantum Entanglement. I have collected some informations about Quantum Entanglement from Wikipedia. Hope you elaborate to make it more informative.... Quantum Entanglement EPR paradox (Einstein, Podolsky, Rosen paradox) show that quantum mechanical theory was incomplete. They wrote: "We are thus forced to conclude that the quantum-mechanical description of physical reality given by wave functions is not complete. It was Erwin Schrödinger who first used the word Entanglement. He wrote the letter to Einstein in German in which he used the word Verschränkung (translated by himself as entanglement) "to describe the correlations between two particles that interact and then separate, as in the EPR experiment. He shortly thereafter published a seminal paper defining and discussing the notion, and terming it "entanglement." Quantum systems can become entangled through various types of interactions. An example of entanglement occurs when subatomic particles decay into other particles. These decay events obey the various conservation laws, and as a result, pairs of particles can be generated so that they are in some specific quantum states. For instance, a pair of these particles may be generated having a two-state spin: one must be spin up and the other must be spin down. This type of entangled pair, where the particles always have opposite spin, is known as the spin anti-correlated case, and if the probabilities for measuring each spin are equal, the pair is said to be in the singlet state. Entanglement has many applications in quantum information theory. With the aid of entanglement, otherwise impossible tasks may be achieved. Among the best-known applications of entanglement are superdense coding and quantum teleportation. Most researchers believe that entanglement is necessary to realize quantum computing (although this is disputed by some). Entanglement is used in some protocols of quantum cryptography. This is because the "shared noise" of entanglement makes for an excellent one-time pad. In interferometry, entanglement is necessary for surpassing the standard quantum limit and achieving the Heisenberg limit. In Fact, Quantum entanglement is a quantum mechanical phenomenon in which the quantum states of two or more objects have to be described with reference to each other, even though the individual objects may be spatially separated. Quantum entanglement is a physical phenomenon that occurs when particles such as photons, electrons, molecules as large as buckyballs and even small diamonds interact and then become separated, with the type of interaction such that each resulting member of a pair is properly described by the same quantum mechanical description (state), which is indefinite in terms of important factors such as position, momentum, spin, polarization, etc. Quantum entanglement is a form of quantum superposition. When a measurement is made and it causes one member of such a pair to take on a definite value, the other member of this entangled pair will at any subsequent time be found to have taken the appropriately correlated value Thus, there is a correlation between the results of measurements performed on entangled pairs, and this correlation is observed even though the entangled pair may have been separated by arbitrarily large distances.
Posted on: Tue, 23 Jul 2013 06:17:25 +0000
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