title: Experimental implementation of bit commitment in the noisy-storage model.
abstract: Fundamental primitives such as bit commitment and oblivious transfer serve as building blocks for many other two-party protocols. Hence, the secure implementation of such primitives is important in modern cryptography. Here we present a bit commitment protocol that is secure as long as the attacker's quantum memory device is imperfect. The latter assumption is known as the noisy-storage model. We experimentally executed this protocol by performing measurements on polarization-entangled photon pairs. Our work includes a full security analysis, accounting for all experimental error rates and finite size effects. This demonstrates the feasibility of two-party protocols in this model using real-world quantum devices. Finally, we provide a general analysis of our bit commitment protocol for a range of experimental parameters.
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore.
authors.forename: Nelly Huei Ying
authors.initials: NH
authors.lastname: Ng
authors.forename: Siddarth K
authors.initials: SK
authors.lastname: Joshi
authors.forename: Chia Chen
authors.initials: CC
authors.lastname: Ming
authors.forename: Christian
authors.initials: C
authors.lastname: Kurtsiefer
authors.forename: Stephanie
authors.initials: S
authors.lastname: Wehner