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KET

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(Abbreviation) Kentucky Educational Television
KET rate this definition:
(Abbreviation) Key English Test
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(Noun) A quantum state in the Dirac formulation of quantum mechanics. A ket is represented by, for example, |n>. The complex conjugate of a ket is called a bra, and written <n|, the multiple of the two being a bra-ket, <n|n>.

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