  We derive the optimal analytical quantum-state-transfer control solutions for
two disparate quantum memory blocks. Employing the SLH formalism description of
quantum network theory, we calculate the full quantum dynamics of system
populations, which lead to the optimal solution for the highest quantum
fidelity attainable. We show that, for the example where the mechanical modes
of two optomechanical oscillators act as the quantum memory blocks, their
optical modes and a waveguide channel connecting them can be used to achieve a
quantum state transfer fidelity of 96% with realistic parameters using our
derived optimal control solution. The effects of the intrinsic losses and the
asymmetries in the physical memory parameters are discussed quantitatively.

Quantum Physics