  Chirality of materials in nature appears when there are asymmetries in their
lattice structures or interactions in a certain environment. Recent development
of quantum simulation technology has enabled the manipulation of qubits.
Accordingly, chirality can be realized intentionally rather than passively
observed. Here we theoretically provide simple methods to create a chiral spin
state in a spin-1/2 qubit system on a square lattice. First, we show that
switching ON/OFF the Heisenberg and $XY$ interactions produces the chiral
interaction directly in the effective Hamiltonian without controlling local
fields. Moreover, when initial states of spin-qubits are appropriately
prepared, we prove that the chirality with desirable phase is dynamically
obtained. Finally, even for the case where switching ON/OFF the interactions is
infeasible and the interactions are always-on, we show that, by preparing an
asymmetric initial qubit state, the chirality whose phase is $\pi/2$ is
dynamically generated.
