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.

中文翻译：

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一种任意隐藏和实际绑定的量子比特承诺协议

位承诺是一项加密任务，其中 Alice 向 Bob 提交一点，这样她在承诺之后就无法更改该位的值，并且 Bob 无法在 Alice 打开她的承诺之前了解该位的值。在本文中，我们提出了一种任意隐藏和实际绑定的量子比特承诺（QBC）协议。与其他任意隐藏和实际绑定的 QBC 协议相比，我们的效率更高。我们的协议中既没有使用多粒子纠缠也没有使用长期量子存储器，这使得它可以通过当前技术实现。