  From the perspective of resource theory, it is interesting to achieve the
same quantum task using as few quantum resources as possible. Semiquantum key
distribution (SQKD), which allows a quantum user to share a confidential key
with a classical user who prepares and operates qubits in only one basis, is an
important example for studying this issue. To further limit the quantum
resources used by users, in this paper, we constructed the first SQKD protocol
which restricts the quantum user to prepare quantum states in only one basis
and removes the classical user's measurement capability. Furthermore, we prove
that the constructed protocol is unconditionally secure by deriving a key rate
expression of the error rate in the asymptotic scenario. The work of this paper
provides inspiration for achieving quantum superiority with minimal quantum
resources.
