Bulletin of the American Physical Society
APS March Meeting 2017
Volume 62, Number 4
Monday–Friday, March 13–17, 2017; New Orleans, Louisiana
Session P0: Kavli Symposium: Quantum Matter and Quantum InformationInvited Plenary Special Event
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Sponsoring Units: APS Chair: William Halperin Room: Hall I-1 |
Wednesday, March 15, 2017 2:30PM - 3:00PM |
P0.00001: Topological States of Quantum Condensed Matter Invited Speaker: F. D. M. Haldane Over the past three decades or more, it has slowly emerged that many unexpected properties of the ground states of certain condensed matter systems are protected by robust non-trivial topological properties of their quantum entanglement, with consequences such as characteristic inevitably-present edge states. Early work exposed such properties in one and two-dimensional systems and the discovery of 3D topological insulators finally completed dimensional coverage. Interest in topological states has grown as some of them are thought to be potential platforms for quantum information processing. I will describe some selected examples of topological states of matter and the history of their discovery. [Preview Abstract] |
Wednesday, March 15, 2017 3:00PM - 3:30PM |
P0.00002: Topological Defects and Phase Transitions Invited Speaker: J Michael Kosterlitz This talk reviews some of the applications of topology and topological defects in phase transitions in two dimensional systems for which Kosterlitz and Thouless split half the 2016 Physics Nobel Prize. The theoretical predictions and experimental verification in two dimensional superfluids, superconductors and crystals will be reviewed because they provide very convincing quantitative agreement with topological defect theories. [Preview Abstract] |
Wednesday, March 15, 2017 3:30PM - 4:00PM |
P0.00003: Currents and Phases in Quantum Rings. Invited Speaker: Kathryn Moler Emergent phenomena in quantum systems often exhibit magnetic signatures. In this talk, I will describe how to use the current in a ring to access fundamental and topological properties of quantum states of charge-carrying particles. Applying a magnetic flux through a ring creates a phase gradient, in response to which a current flows, creating magnetic fields that we measure with a scanning SQUID microscope. I will take you on a tour of currents and phases in common and exotic quantum materials$.$ Gold rings are normal metals with finite resistance down to the lowest measured temperatures. Remarkably, they nevertheless carry currents that flow forever (called persistent currents), whose sign and magnitude are a test of quantum theories of disordered metals. Aluminum rings superconduct at low temperatures, and are an ideal model system to study superconducting fluctuations. The strong agreement of theory and experiment in conventional metals and superconductors sets the stage to study superconducting rings interrupted by a single Josephson junction. This geometry allows us to measure a fundamental and informative property of the junction, called the current-phase relation. In junctions made of topological materials, the current could theoretically be 4pi-periodic rather than 2pi-periodic as a function of the phase winding in the ring. I will report on progress towards this smoking-gun signature for Majorana modes. [Preview Abstract] |
Wednesday, March 15, 2017 4:00PM - 4:30PM |
P0.00004: Phase-sensitive measurements of exotic superconducting quantum materials and hybrid superconductor devices Invited Speaker: Dale Van Harlingen Many of the most interesting quantum materials are intrinsic superconductors or are induced by proximity to a superconductor. In these materials, unique information about their quantum state and excitations can be revealed by measuring their phase-dependent properties. The directionality and phase-sensitivity of the Josephson effect, the tunneling of Cooper pairs between two superconductors, provides a powerful probe of the phase anisotropy of unconventional superconductors and the nature of coherent states in hybrid devices incorporating superconductors and complex materials. In this talk, I will first review the technique and applications of Josephson interferometry. I will describe how this approach, originally developed to determine the order parameter symmetry of the high temperature cuprate superconductors, is now being used to probe many other exotic superconducting materials which exhibit multiple superconducting states, complex order parameters that break time-reversal symmetry, and topological properties. I will then describe related techniques for measuring the current-phase relation of Josephson devices. I will outline how these are being used to study supercurrent transport in hybrid devices that reveal phase-modulated electronic structure, explore the interplay of superconductivity and magnetism, and search for exotic excitations such as Majorana fermion states in topological superconductor devices that could enable topologically-protected quantum computing. [Preview Abstract] |
Wednesday, March 15, 2017 4:30PM - 5:00PM |
P0.00005: Hybrid quantum systems: Outsourcing superconducting qubits Invited Speaker: Andrew Cleland Superconducting qubits offer excellent prospects for manipulating quantum information, with good qubit lifetimes, high fidelity single- and two-qubit gates, and straightforward scalability (admittedly with multi-dimensional interconnect challenges). One interesting route for experimental development is the exploration of hybrid systems, i.e. coupling superconducting qubits to other systems. I will report on our group's efforts to develop approaches that will allow interfacing superconducting qubits in a quantum-coherent fashion to spin defects in solids, to optomechanical devices, and to resonant nanomechanical structures. The longer term goals of these efforts include transferring quantum states between different qubit systems; generating and receiving ``flying'' acoustic phonon-based as well as optical photon-based qubits; and ultimately developing systems that can be used for quantum memory, quantum computation and quantum communication, the last in both the microwave and fiber telecommunications bands. [Preview Abstract] |
Wednesday, March 15, 2017 5:00PM - 5:30PM |
P0.00006: Protecting quantum information in superconducting circuits Invited Speaker: Michel Devoret Can we prolong the coherence of a two-state manifold in a complex quantum system beyond the coherence of its longest-lived component? This question is the starting point in the construction of a scalable quantum computer. It translates in the search for processes that operate as some sort of Maxwell’s demon and reliably correct the errors resulting from the coupling between qubits and their environment. The presentation will review recent experiments that test the dynamical protection by Josephson circuits of a logical qubit memory based on superpositions of particular coherent states of a superconducting resonator. [Preview Abstract] |
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