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厄米共轭。

class sympy.physics.quantum.dagger.Dagger(arg)[源代码]#

一般厄米共轭运算。

参数:

arg ：表达式

The SymPy expression that we want to take the dagger of.

评价 布尔

Whether the resulting expression should be directly evaluated.

解释

Take the Hermetian conjugate of an argument [R756]. For matrices this operation is equivalent to transpose and complex conjugate [R757].

实例

攻击各种量子物体：

>>> from sympy.physics.quantum.dagger import Dagger
>>> from sympy.physics.quantum.state import Ket, Bra
>>> from sympy.physics.quantum.operator import Operator
>>> Dagger(Ket('psi'))
<psi|
>>> Dagger(Bra('phi'))
|phi>
>>> Dagger(Operator('A'))
Dagger(A)

内外产品：

>>> from sympy.physics.quantum import InnerProduct, OuterProduct
>>> Dagger(InnerProduct(Bra('a'), Ket('b')))
<b|a>
>>> Dagger(OuterProduct(Ket('a'), Bra('b')))
|b><a|

幂、数和积：

>>> A = Operator('A')
>>> B = Operator('B')
>>> Dagger(A*B)
Dagger(B)*Dagger(A)
>>> Dagger(A+B)
Dagger(A) + Dagger(B)
>>> Dagger(A**2)
Dagger(A)**2

Dagger还可以无缝地处理复数和矩阵：

>>> from sympy import Matrix, I
>>> m = Matrix([[1,I],[2,I]])
>>> m
Matrix([
[1, I],
[2, I]])
>>> Dagger(m)
Matrix([
[ 1,  2],
[-I, -I]])

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