  Representations of Spin groups and Clifford algebras derived from the
structure of qubit trees are introduced in this work. For ternary trees the
construction is more general and reduction to binary trees is formally defined
by deletion of superfluous branches. The usual Jordan--Wigner construction also
may be formally obtained in this approach by bringing the process up to trivial
qubit chain (trunk). The methods can also be used for effective simulation of
some quantum circuits corresponding to the binary tree structure. The modeling
of more general qubit trees, as well as the relationship with the mapping used
in the Bravyi--Kitaev transformation, are also briefly discussed.
