An open quantum system inevitably decoheres due to unwanted interactions with its dissipative environment. Such decoherence is a primary hurdle for constructing a large-scale quantum computer and much research is spent in “closing the system” i.e. improving qubit relaxation time, T1 and dephasing time, Tf. However, decoherence can also be…
Topology and correlations are two fundamental aspects that determine the electronic ground states of condensed matter systems. Both aspects individually have led to striking observations such as the quantum spin Hall insulating state and superconductivity, respectively. The combination of them can result in exotic phenomena including…
Integrating cold atoms with nanophotonics enables the exploration of new paradigms in quantum optics and many body physics. Advanced fabrication capabilities for low-loss dielectric materials provide powerful tools to engineer band structure and light-matter couplings between photons and atoms. The current system at Caltech to explore such…
The realization of large-scale controlled quantum systems is an exciting frontier in modern physical science. In this talk, I will introduce a new approach based on cold atoms in arrays of optical tweezers. We use atom-by-atom assembly to deterministically prepare arrays of individually controlled cold atoms. A measurement and feedback…
We study the Eigenstate Thermalization Hypothesis (ETH) in chaotic conformal field theories (CFTs) of arbitrary dimensions. Assuming local ETH, we compute the reduced density matrix of a ball-shaped subsystem of finite size in the infinite volume limit when the full system is an energy eigenstate. This reduced density matrix is close in trace…
Studies of the anisotropies in the Cosmic Microwave Background (CMB) are now focused on recovering primordial signals from polarization patterns on the sky. The demand for instruments with greater raw sensitivity is being met by scaling the density of telescope focal planes up to thousands, and tens of thousands, of detectors. Transition-edge…
Embryology at the beginning of the 21st century finds itself in a situation similar to neurobiology; the behavior of the component pieces is understood in some detail, but how they self-assemble to become life is still very hazy. There are hundreds of molecules that enable cell communication and genetics defines their function by classifying…
Abstract: The DarkSide collaboration aims for a dark matter direct detection using Argon-based dual-phase Time
Projection Chambers (TPCs), capable of observing both the scintillation and the ionization signals of
recoiling nuclei. The DarkSide “zero-background” strategy exploits the pulse shape discrimination
intrinsic of…
Abstract:
Lithographed superconducting detectors have found many applications in millimeter and submillimeter astronomy including observations of the cosmic microwave background (CMB). A major goal of modern cosmology is to make precise measurements of the polarized fluctuations in the CMB with science goals such as a measurement of…
Abstract: Artificial Intelligence/Machine learning has seen large growth and a number of successes over the past few years. In this talk I will describe some of the core ideas and algorithms along with corresponding results. We will start by thinking about intelligence in general. This will lead us to the problem of perception, where I will…
Dipolar interactions are fundamentally different from the usual van der Waals forces in real gases. Besides the anisotropy the dipolar interaction is nonlocal and as such allows for self organized structure formation. Candidates for dipolar species are polar molecules, Rydberg atoms and magnetic atoms. More than ten years ago the first dipolar…
Abstract:
We study one dimensional insulators obeying a chiral symmetry in the single-particle picture where the Fermi energy is assumed to lie within a mobility gap. Topological invariants are defined for infinite (bulk) or half-infinite (edge) systems, and it is shown that for a given bulk system with…
Abstract: New physics beyond the Standard Model may show up at the LHC in the form of boosted particles decaying hadronically, resulting in fat jets with unusual substructure. A simple possibility is heavy resonances decaying into pairs of boosted W, Z, and Higgs bosons which can form 2-prong fat jets, and these models are targeted by a wide…
I will review recent developments in the understanding of Lorentzian correlators in generic CFTs. I will then discuss two applications of these developments. The first one involves bounds on the OPE coefficients on the leading Regge trajectory. In theories with gravity duals, it constrains certain higher-derivative corrections to the Einstein…
Abstract:
The Kitaev model on a honeycomb lattice predicts a special quantum spin liquid (QSL) ground state with excitations resembling Majorana Fermions and gauge flux excitations. These emergent features are exciting prospects to both basic physics and applications towards a lossless technology for…
We explain recent ideas that led to rapid progress on the dynamics of gauge theories in 2+1 dimensions.
We discuss gauge theories with matter particles in the fundamental as well as in the adjoint representations. We make predictions for new phases of these theories and explain some special cases where these predictions can be…
SPIDER is a balloon-borne telescope designed to measure the polarization of the cosmic microwave background at degree angular scales. With two flights, SPIDER aims to constrain the amplitude of primordial gravitational waves by measuring or placing an upper limit on the tensor-to-scalar ratio, r<0.03 (3 sigma) in the presence of foregrounds…
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