76 research outputs found
QCD perturbation theory at large orders with large renormalization scales in the large beta(0) limit
Chip-to-chip optical wireless link feasibility using optical phased arrays on silicon-on-insulator
One- and two-dimensional integrated optical phased arrays (OPAs) on silicon-on-insulator have been fabricated and measured having directivities of more than 40dBi and steering ranges up to 10 degrees . These OPAs would allow data rates of 100Mbps at distances up to 0.5m
Hamiltonian simulation of the Schwinger model at finite temperature
Using Matrix Product Operators (MPO) the Schwinger model is simulated in
thermal equilibrium. The variational manifold of gauge invariant MPO is
constructed to represent Gibbs states. As a first application the chiral
condensate in thermal equilibrium is computed and agreement with earlier
studies is found. Furthermore, as a new application the Schwinger model is
probed with a fractional charged static quark-antiquark pair separated
infinitely far from each other. A critical temperature beyond which the string
tension is exponentially suppressed is found, which is in qualitative agreement
with analytical studies in the strong coupling limit. Finally, the CT symmetry
breaking is investigated and our results strongly suggest that the symmetry is
restored at any nonzero temperature.Comment: Updated manuscript matching its published version: more detailed
continuum extrapolation of chiral condensate in section II
Tensor networks for gauge field theories
Over the last decade tensor network states (TNS) have emerged as a powerful
tool for the study of quantum many body systems. The matrix product states
(MPS) are one particular class of TNS and are used for the simulation of
(1+1)-dimensional systems. In this proceeding we use MPS to determine the
elementary excitations of the Schwinger model in the presence of an electric
background field. We obtain an estimate for the value of the background field
where the one-particle excitation with the largest energy becomes unstable and
decays into two other elementary particles with smaller energy.Comment: Proceeding of talk presented at the 33rd International Symposium on
Lattice Field Theory, 14-18 July 2015, Kobe, Japan; Proceeding of talk
presented at The European Physical Society Conference on High Energy Physics,
22-29 July 2015, Vienna, Austria (PoS(EPS-HEP2015)375
Entanglement rates and the stability of the area law for the entanglement entropy
We prove a conjecture by Bravyi on an upper bound on entanglement rates of local Hamiltonians. We then use this bound to prove the stability of the area law for the entanglement entropy of quantum spin systems under adiabatic and quasi-adiabatic evolutions
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