Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W44: Detecting and Exploiting Entanglement of Correlated SystemsInvited Live Streamed
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Sponsoring Units: DCMP DCOMP DAMOP Chair: Anthony Begley, American Physical Society Room: McCormick Place W-375C |
Thursday, March 17, 2022 3:00PM - 3:36PM |
W44.00001: Information theoretic measures of the pseudogap and of superconductivity in the two-dimensional Hubbard model Invited Speaker: Giovanni Sordi Quantum and classical correlations among electrons in quantum many-body systems give rise to striking phases of matter. Quantum information theory provides new concepts, based on the nature of the entanglement, for characterizing phases of matter and phase transitions in such systems. In this talk, I’ll discuss how quantum information concepts based on entanglement-related properties can be used to provide new insights on the pseudogap and on the strongly correlated superconductivity emerging from a doped Mott insulator. I’ll review recent work [1-4] on this problem in the context of the two-dimensional Hubbard model at finite temperature with cluster dynamical mean-field theory and with a focus on key measures of correlations—thermodynamic entropy, local entropy, and total mutual information. I will outline that the unveiled links between quantum and classical correlations provide a unified framework for the phenomenology of cuprates and predictions for ultracold atoms in optical lattices. |
Thursday, March 17, 2022 3:36PM - 4:12PM |
W44.00002: Entanglement transitions in monitored quantum states Invited Speaker: Ehud Altman
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Thursday, March 17, 2022 4:12PM - 4:48PM |
W44.00003: Atoms Interlinked by Light: Programming Interactions and Probing Entanglement Invited Speaker: Monika H Schleier-Smith The graph of interactions in a quantum many-body system is crucial for governing the flow of information and the structure of correlations. We engineer programmable nonlocal interactions in an array of atomic ensembles within an optical resonator, where photons convey information between distant atomic spins. In our system of spin-1 atoms, the photon-mediated interactions manifest in the formation of correlated atom pairs. For all-to-all interactions, we quantify the resulting entanglement by observing spin-nematic squeezing. We furthermore achieve versatile control of the graph of interactions by programming the spectrum of an optical drive field, thereby realizing effective geometries entirely distinct from the physical geometry of the array. We apply this toolbox to explore frustrated interactions, non-trivial topologies, and an emergent treelike geometry inspired by concepts of quantum gravity. |
Thursday, March 17, 2022 4:48PM - 5:24PM |
W44.00004: Witnessing entanglement in quantum magnets using neutron scattering Invited Speaker: Allen O Scheie Quantum entanglement is a key driver of exotic physics in quantum materials, but it historically has been extremely hard to measure. I will discuss recent experiments showing how quantum spin entanglement can be extracted from neutron scattering data using the tools of quantum information theory. We applied these protocols to 1D spin chains KCuF3, Cs2CoCl4, and triangular lattice delafossite KYbSe2. Of the three protocols we tested, we found Quantum Fisher Information (QFI) to be the most experimentally robust. Crucially, these protocols do not require theoretical models, which are only sometimes available for 2D and 3D quantum systems. Entanglement witnesses in KYbSe2 show evidence of a proximate quantum spin liquid phase, which is confirmed by comparison to numerical simulations of a 2D triangular lattice spin liquid. |
Thursday, March 17, 2022 5:24PM - 6:00PM |
W44.00005: Quantum Interactive Dynamics Invited Speaker: Vedika Khemani A confluence of developments across a range of subfields --- particularly experimental advances in building Noisy Intermediate-Scale Quantum (NISQ) devices --- have opened up a vast new territory of studying many-body phenomena in novel regimes: highly excited, "post Hamiltonian", and far from equilibrium. The natural evolutions implemented by these novel experiments are dynamics generated by quantum circuits of unitary gates, possibly interrupted by measurements, and starting from initial states that are not low energy in any useful sense. These platforms present an opportunity to explore vastly larger tracts of Hilbert space that are normally hard to reach. They also present new ways to interrogate a quantum system to probe complex quantum correlations, for instance, via an interactive dialog with a classical experimenter. I will describe novel emergent phenomena in the non-equilibrium entanglement dynamics of interactive quantum circuits. |
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