Publications (2)0 Total impact
ABSTRACT: We introduce a new control strategy on a two-way deterministic cryptographic
scheme, which relies on a suitable unitary transformation rather than quantum
measurement. The study is developed for d-ary alphabets and the particular
choice of the transformation works when d is an odd prime power. It leads to an
improvement of the protocol security, which we prove to increase with the
alphabet order d.
ABSTRACT: We present an extension to a d-ary alphabet of a recently proposed deterministic quantum key distribution protocol. It relies on the use of mutually unbiased bases in prime power dimension d, for which we provide an explicit expression. Then, by considering a powerful individual attack, we show that the security of the protocol is maximal for d=3. Comment: 12 pages, 2 figures