An Arbitrarily Concealing and Practically Binding Quantum Bit Commitment Protocol

Bit commitment is a cryptographic task in which Alice commits a bit to Bob such that she cannot change the value of the bit after her commitment and Bob cannot learn the value of the bit before Alice opens her commitment. In this paper, we propose a quantum bit commitment (QBC) protocol which is arbitrarily concealing and practically binding. Compared to other arbitrarily concealing and practically binding QBC protocols, ours is more efficient. Neither multi-particle entanglement nor long-term quantum memory is used in our protocol, which makes it implementable by the current technology.