Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session K43: Breakthroughs in Quantum DynamicsInvited
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Sponsoring Units: DCMP Chair: Anatoli Polkovnikov Room: BCEC 210B |
Wednesday, March 6, 2019 8:00AM - 8:36AM |
K43.00001: Spatio-temporal quenches for fast preparation of ground states of critical models Invited Speaker: Kartiek Agarwal The difficulty of preparing highly entangled quantum states poses an important challenge in engineering artificial quantum systems for the purposes of computation and simulation. Adiabatic methods which slowly evolve unentangled states to entangled states are typically slow and particularly fail at criticality where the gap between eigenstates vanishes. The search for novel non-adiabatic methods for quantum state preparation is a topic of current research interest, and immense experimental relevance. I will describe the state of the art in the field and discuss our proposal(s) using spatio-temporal quenches to efficiently prepare the ground states of arbitrary interacting critical theories in one dimension and beyond. |
Wednesday, March 6, 2019 8:36AM - 9:12AM |
K43.00002: Localization and Thermalization in Nuclear Spin Chains Invited Speaker: Paola Cappellaro TBD |
Wednesday, March 6, 2019 9:12AM - 9:48AM |
K43.00003: Many body localization with long range interactions Invited Speaker: Rahul Nandkishore Many-body localization (MBL) has emerged as a powerful paradigm for understanding nonequilibrium quantum dynamics. Folklore based on perturbative arguments holds that MBL arises only in systems with short-range interactions. I will present nonperturbative arguments indicating that MBL can arise in systems with long-range (Coulomb) interactions, through a mechanism dubbed “order enabled localization.” In particular, one can show using bosonization that MBL can arise in one-dimensional systems with ∼r interactions, a problem that exhibits charge confinement. One can also show that (through the Anderson-Higgs mechanism) MBL can arise in two-dimensional systems with log(r) interactions, and perhaps even in three-dimensional systems with 1/r interactions. The extension to three dimensions requires developing a theory of localization of extended quantum objects. The arguments are asymptotic (i.e., valid up to rare region corrections), yet they open the door to investigation of MBL physics in a wide array of long-range interacting systems where such physics was previously believed not to arise. They also open the door to using MBL to stabilize driven superconductivity. |
Wednesday, March 6, 2019 9:48AM - 10:24AM |
K43.00004: Exploring Quantum Thermalization Near Integrability in a Dipolar Quantum Newton’s Cradle Invited Speaker: Benjamin Lev Isolated quantum many-body systems with integrable dynamics generically do not thermalize starting from generic initial states when taken far from equilibrium. As one perturbs such systems away from the integrable point, thermalization sets in, but the nature of the crossover from integrable to thermalizing behavior is an unresolved and actively discussed question. We explore this question by studying the dynamics of the momentum distribution function in a dipolar quantum Newton's cradle consisting of highly magnetic dysprosium atoms. This is accomplished by creating an ultracold one-dimensional Bose gas with strong magnetic dipole-dipole interactions. These interactions provide tunability of both the strength of the integrability-breaking perturbation and the nature of the near-integrable dynamics. We provide the first experimental evidence that thermalization close to a strongly interacting integrable point occurs in two steps: prethermalization followed by near-exponential thermalization. Moreover, the measured thermalization rate is consistent with a parameter-free theoretical estimate, based on identifying the types of collisions that dominate thermalization. By providing tunability between regimes of integrable and nonintegrable, chaotic dynamics, our work sheds light both on the mechanisms by which isolated quantum many-body systems thermalize, and on the temporal structure of the onset of thermalization. Reference: Y. Tang, W. Kao, K.-Y. Li, S. Seo, K. Mallayya, M. Rigol, S. Gopalakrishnan, and B. L. Lev, Phys. Rev. X 8, 021030 (2018). |
Wednesday, March 6, 2019 10:24AM - 11:00AM |
K43.00005: Many body quantum chaos Invited Speaker: Tomasz Prosen TBD |
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