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Abstract: The field of circuit QED has emerged as a rich platform for both quantum computation and quantum simulation. Lattices of coplanar waveguide (CPW) resonators realize artificial photonic materials in the tight-binding limit. Combined with strong qubit-photon interactions, these systems can be used to study dynamical phase transitions, many-body phenomena, and spin models in driven-dissipative systems.
Abstract: Thermalization in open quantum systems has recently attracted attention from quantum information and quantum chaos. Today, I will first formulate thermalization in terms of Lindbladians and, as a bonus, present a quantum algorithm that efficiently emulates this process. Second, we show fast convergence assuming the Eigenstate Thermalization Hypothesis (ETH). The talk is based on joint works with Fernando Brandao and with Andras Gilyen and Michael Kastoryano.
Abstract: Nonlocal games yield an unusual perspective on entangled quantum states. The defining property of such games is that a set of players in joint possession of an entangled state can win the game with higher probability than is allowed by classical physics.
Abstract: An interesting problem in the field of quantum error correction involves finding a physical system that hosts a "passively-protected quantum memory,'' defined as an encoded qubit coupled to an environment that naturally wants to correct errors.
Abstract: One of the most intriguing outcomes of casting our thinking about the world around us in mathematical terms is that phenomena that were thought to be quite distinct are instead revealed as being the “same.” Thinkers as long ago as Pliny the Elder made observations on active matter noting: "It is a peculiarity of the starling to fly in troops, as it were, and then to wheel round in a globular mass like a ball, the central troop acting as a pivot for the rest.’’ In this talk I will introduce field theory and the emergence of the modern theory of active matter as for
Abstract: Cavity QED systems are emerging as leading platforms for quantum simulation of tunable long-range interacting spin models and spin-boson models featuring rich steady-state and non-equilibrium many-body behaviors. We propose a new direction that uses multilevel atoms in an optical cavity as a toolbox to engineer new types of bosonic models, which features correlated hopping processes in a synthetic two-leg ladder spanned by atomic ground states.
Abstract: Defects have been playing an increasingly important role in our understanding of quantum phases of matter and quantum field theories in general. Closed defects can be created by applying the associated symmetry transformation, known as a disorder operator, to a finite region. Expectation value of the disorder operator in a symmetry-preserving ground state contains universal information about the underlying state.
Abstract: Topological superconductivity, charge order and electronic nematic phases are all fascinating phases of matter that have been observed in several quantum materials of recent interest. The nematic phase, wherein electronic degrees of freedom drive a reduction in crystal rotational symmetry, is a common motif across a number of high temperature superconductors, while charge order has become a ubiquitous component of several newly studied superconductors.