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creation operator

Creation operators and annihilation operators are mathematical operators that have widespread applications in quantum mechanics, notably in the study of quantum harmonic oscillators and many-particle systems. An annihilation operator (usually denoted a) lowers the number of particles in a given state by one. A creation operator (usually denoted a†) increases the number of particles in a given state by one, and it is the adjoint of the annihilation operator. In many subfields of physics and chemistry, the use of these operators instead of wavefunctions is known as second quantization. They were introduced by Paul Dirac. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Creation_and_annihilation_operators)

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