Seminar, Leo Zhou (Harvard), Symmetry-Protected Dissipative Preparation of Matrix Product States


Thursday, November 7, 2019, 11:00am


Lyman 338

Title: Symmetry-Protected Dissipative Preparation of Matrix Product States

Abstract: We propose and analyze a method for efficient dissipative preparation of matrix product states that exploits their symmetry properties. Specifically, we construct an explicit protocol that makes use of driven-dissipative dynamics to prepare the Affleck-Kennedy-Lieb-Tasaki (AKLT) states, which features symmetry-protected topological order and non-trivial edge excitations. We show that the use of symmetry allows for robust experimental implementation without fine-tuned control parameters. Numerical simulations show that the preparation time scales polynomially in system size n. Furthermore, we demonstrate that this scaling can be improved to O(log2 n) by using parallel preparation of AKLT segments and fusing them via quantum feedback. A concrete scheme using excitation of trapped neutral atoms into Rydberg state via Electromagnetically Induced Transparency is proposed, and generalizations to a broader class of matrix product states are discussed.