  We consider a system of static spin qubits embedded in a one-dimensional spin
coherent channel and develop a scheme to readout the state of one and two
qubits separately. We use unpolarized flying qubits for this purpose that
scatter off from the static qubits due to the Heisenberg exchange interaction.
Analysing the transmission coefficient as a function of density matrix elements
along with additional unitary gates we reconstruct the state of static qubits.
