PIRSA:20050011

MIP* = RE

Yuen, H. (2020). MIP* = RE. Perimeter Institute. https://pirsa.org/20050011

Yuen, Henry. MIP* = RE. Perimeter Institute, May. 13, 2020, https://pirsa.org/20050011 

          @misc{ pirsa_PIRSA:20050011,
            doi = {10.48660/20050011},
            url = {https://pirsa.org/20050011},
            author = {Yuen, Henry},
            keywords = {Quantum Information},
            language = {en},
            title = { MIP* = RE},
            publisher = {Perimeter Institute},
            year = {2020},
            month = {may},
            note = {PIRSA:20050011 see, \url{https://pirsa.org}}
          }

Henry Yuen University of Toronto

DOI 10.48660/20050011
Collection
Talk Type Scientific Series
Subject

Abstract

MIP* denotes the class of problems that admit interactive proofs with quantum entangled provers. It has been an outstanding question to characterize the complexity of this class. Most notably, there was no known computable upper bound on MIP*.

We show that MIP* is equal to the class RE, the set of recursively enumerable languages. In particular, this shows that MIP* contains uncomputable problems. Through a series of known connections, this also yields a negative answer to Connes’ Embedding Problem from the theory of operator algebras. In this talk, I will explain the connection between Connes' Embedding Problem, quantum information theory, and complexity theory. I will then give an overview of our approach, which involves reducing the Halting Problem to the problem of approximating the entangled value of nonlocal games.

Joint work with Zhengfeng Ji, Anand Natarajan, Thomas Vidick, and John Wright.