  We present a bit-string quantum oblivious transfer protocol based on
single-qubit rotations. Our protocol is built upon a previously proposed
quantum public-key protocol and its practical security relies on the laws of
Quantum Mechanics. Practical security is reflected in the fact that, due to
technological limitations, the receiver (Bob) of the transferred bit-string is
restricted to performing only "few-qubit" coherent measurements. We also
present a single-bit oblivious transfer based on the proposed bit-string
protocol. The protocol can be implemented with current technology based on
optics.
