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Preparation of a quantum register is an important step in quantum computationand quantum information processing. It is straightforward to build a simplequantum state such as $|i_1 i_2 ... i_n\ket$ with $i_j$ being either 0 or 1,but is a non-trivial task to construct an {\it arbitrary} superposed quantumstate. In this Paper, we present a scheme that can most generally initialize aquantum register with an arbitrary superposition of basis states.Implementation of this scheme requires $O(Nn^2)$ standard 1- and 2-bit gateoperations, {\it without introducing additional quantum bits}. Application ofthe scheme in some special cases is discussed.Comment: 4 pages, 4 figures, accepted by Phys. Rev.

Efficient scheme for initializing a quantum register with an arbitrary superposed state