basis
For example, given two basis vectors 



{

|

0

⟩

A


,

|

1

⟩

A


}


{\displaystyle \{|0\rangle _{A},|1\rangle _{A}\}}

 of HA and two basis vectors 



{

|

0

⟩

B


,

|

1

⟩

B


}


{\displaystyle \{|0\rangle _{B},|1\rangle _{B}\}}

 of HB, the following is an entangled state:
