  We demonstrate a client-server quantum key distribution (QKD) scheme, with
large resources such as laser and detectors situated at the server-side, which
is accessible via telecom-fibre, to a client requiring only an on-chip
polarisation rotator, that may be integrated into a handheld device. The
detrimental effects of unstable fibre birefringence are overcome by employing
the reference frame independent QKD protocol for polarisation qubits in
polarisation maintaining fibre, where standard QKD protocols fail, as we show
for comparison. This opens the way for quantum enhanced secure communications
between companies and members of the general public equipped with handheld
mobile devices, via telecom-fibre tethering.
