Ket
nounEtymology Learned borrowing from Ket кеʼт (keˀt, “human being”), via Russian.
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A member of a people of Krasnoyarsk Krai in Central Siberia, Russia.
ket
nounalso spelled Ket/kɛt/
Etymology From bra-ket notation invented by Paul Dirac, from bracket.
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Linear algebra, Mathematics, Sciences A column vector, in Hilbert space, especially as representing the state of a quantum mechanical system; the complex conjugate transpose of a bra (a row vector); a ket vector. Symbolised by |...〉.
Quantum mechanics
- A particular ket, say #124;A#92;rangle, might be represented by a particular column vector. Its corresponding bra, #92;langleA#124;, would then be represented by the row vector which is the transpose conjugate of that column vector.