  The transfer of information between two physical locations is an essential
component of both classical and quantum computing. In quantum computing the
transfer of information must be coherent to preserve quantum states and hence
the quantum information. We establish a simple protocol for transferring one-
and two-electron encoded logical qubits in quantum dot arrays. The theoretical
energetic cost of this protocol is calculated - in particular, the cost of
freezing and unfreezing tunnelling between quantum dots. Our results are
compared with the energetic cost of shuttling qubits in quantum dot arrays and
transferring classical information using classical information buses. Only our
protocol can manage constant dissipation for any chain length. This protocol
could reduce the cooling requirements and constraints on scalable architectures
for quantum dot quantum computers.
