Simplified quantum bit commitment using single photon nonlocality
We simplified our previously proposed quantum bit commitment (QBC) protocol based on the MachZehnder interferometer, by replacing symmetric beam splitters with asymmetric ones. It eliminates the need for random sending time of the photons; thus, the feasibility and efficiency are both improved. The protocol is immune to the cheating strategy in the Mayers-Lo-Chau no-go theorem of unconditionally secure QBC, because the density matrices of the committed states do not satisfy a crucial condition on which the no-go theorem holds.
quantum bit commitment quantum cryptography quantum key distribution quantum nonlocality