Quantum Bit Commitment Based on Qubit Oblivious Transfer

Bit commitment (BC) is a powerful primitive of great theoretical and practical significance. In order to resist coherent attack of BC scheme, we decrease Alice's participation responsibility in the protocol to avoid any chance that she solely prepares particles for Bob. We introduce an extended version of 1-out-of-2 oblivious transfer 1-out-of-2 qubit oblivious transfer (1-out-of-2 qu-OT), and show that 1-out-of-2 qu-OT is sufficient to lead to quantum BC. In our new BC scheme, Alice and Bob jointly prepare a four-particle system before the protocol under the surveillance of each other, which excludes any participant's misbehaviors during the preparation phase and thus the presented BC scheme does not break Mayers-Lo-Chau no-go theorem.