Fermion¶

Fermionic quantum operators.

class sympy.physics.quantum.fermion.FermionFockBra(n)[source]¶

Fock state bra for a fermionic mode.

Parameters:: n : Number

The Fock state number.

class sympy.physics.quantum.fermion.FermionFockKet(n)[source]¶

Fock state ket for a fermionic mode.

Parameters:: n : Number

The Fock state number.

class sympy.physics.quantum.fermion.FermionOp(*args, **hints)[source]¶

A fermionic operator that satisfies {c, Dagger(c)} == 1.

Parameters:

name : str

A string that labels the fermionic mode.

annihilation : bool

A bool that indicates if the fermionic operator is an annihilation (True, default value) or creation operator (False)

Examples

>>> from sympy.physics.quantum import Dagger, AntiCommutator
>>> from sympy.physics.quantum.fermion import FermionOp
>>> c = FermionOp("c")
>>> AntiCommutator(c, Dagger(c)).doit()
1