  Quantum communication is an important application that derives from the
burgeoning field of quantum information and quantum computation. Focusing on
secure communication, quantum cryptography has two major directions of
development, namely quantum key distribution and quantum encryption. In this
work we propose a quantum encryption protocol that utilizes a quantum algorithm
to create blocks of ciphertexts based on quantum states. The main feature of
our quantum encryption protocol is that the encryption configuration of each
block is determined by the previous blocks, such that additional security is
provided. We then demonstrate our method by an example model encrypting the
English alphabet, with numerical simulation results showing the large error
rate of a mock attack by a potential adversary. With possible future
improvements in mind, our quantum encryption protocol is a capable addition to
the toolbox of quantum cryptography.
