We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A lowercase a with a dagger superscript, adding one quantum.
Also known as: Raising operator, a with a dagger superscript, Creation operator
The dagger marks the creation operator: it raises a state by one quantum of excitation, or adds one particle. The dagger is a Hermitian conjugate, so the creation and annihilation operators are each other's mirror image and the whole formalism is built from that pair.
Denotes the creation operator, raising a quantum state's occupation number by one.
Contexts: Laboratory
Is the Hermitian conjugate of the annihilation operator, which is what the dagger superscript denotes.
Contexts: Laboratory
Builds every state of a quantum field from the vacuum by repeated application, which is the basis of second quantisation.
Contexts: Laboratory
A lowercase letter a with a small cross-hilted dagger set high to its right.