Institute of Advanced Studies (IAS)
Recent Submissions

Nonlinear circuit quantum electrodynamics based on the chargequbit–resonator interface
(2018)We theoretically explore the applications of a nonlinear circuit QED system, where a charge qubit is inductively coupled to an LC resonator, in the photonic engineering and ultrastrongcoupling multiphoton quantum optics. ... 
Floquet stroboscopic divisibility in nonMarkovian dynamics
(2018)We provide a general description of a timelocal master equation for a system coupled to a nonMarkovian reservoir based on Floquet theory. This allows us to have a divisible dynamical map at discrete times, which we refer ... 
SU(3) topological insulators in the honeycomb lattice
(2018)We investigate realizations of topological insulators with spin1 bosons loaded in a honeycomb optical lattice and subjected to a SU ( 3 ) spinorbit coupling—a situation which can be realized experimentally using ... 
Quantum state transmission in a superconducting charge qubitatom hybrid
(2016)Hybrids consisting of macroscopic superconducting circuits and microscopic components, such as atoms and spins, have the potential of transmitting an arbitrary state between different quantum species, leading to the ... 
Entanglement convertibility by sweeping through the quantum phases of the alternating bonds XXZ chain
(2016)We study the entanglement structure and the topological edge states of the ground state of the spin1/2 XXZ model with bond alternation. We employ paritydensity matrix renormalization group with periodic boundary conditions. ... 
Second harmonic generation in the Weyl semimetal TaAs from a quantum kinetic equation
(2018)We classify the sources of second harmonic generation (SHG) of the Weyl semimetal TaAs by collisionless quantum kinetic equation into three kinds: i.e., injection current from the canonical band dispersion, shift current ... 
An atomtronic flux qubit : a ring lattice of Bose–Einstein condensates interrupted by three weak links
(2016)We study a physical system consisting of a Bose–Einstein condensate confined to a ring shaped lattice potential interrupted by three weak links. The system is assumed to be driven by an effective flux piercing the ring ... 
Population mixing due to dipoledipole interactions in a onedimensional array of multilevel atoms
(2018)We examine theoretically how dipoledipole interactions arising from multiple photon scattering lead to a modified distribution of groundstate populations in a driven, ordered onedimensional array of multilevel atoms. ... 
Beating the ClauserHorneShimonyHolt and the Svetlichny games with optimal states
(2016)We study the relation between the maximal violation of Svetlichny's inequality and the mixedness of quantum states and obtain the optimal state (i.e., maximally nonlocal mixed states, or MNMS, for each value of linear ... 
Entanglement witness via symmetric twobody correlations
(2016)We construct an entanglement witness for manyqubit systems, based on symmetric twobody correlations with two measurement settings. This witness is able to detect the entanglement of some Dicke states for any number of ... 
Chargequbit–atom hybrid
(2016)We investigate a hybrid system of a superconducting charge qubit interacting directly with a single neutral atom via electric dipole coupling. Interfacing of the macroscopic superconducting circuit with the microscopic ... 
Photon transport mediated by an atomic chain trapped along a photonic crystal waveguide
(2018)We theoretically investigate the transport properties of a weak coherent input field scattered by an ensemble of Λtype atoms coupled to a onedimensional photonic crystal waveguide. In our model, the atoms are randomly ... 
‘A better life for all’ : prefigurative and strategic politics in Southern Africa
(2016)Prefigurative politics is a resurgent concept, seeking to explain a diverse array of social phenomena, from Occupy Wall Street to carsharing cooperatives. The driving force behind these activities is said to be a combination ... 
Unified composite scenario for inflation and dark matter in the Nambu–JonaLasinio model
(2017)In this work, we propose a cosmological scenario inherently based on the effective Nambu–JonaLasinio (NJL) model that cosmic inflation and dark matter can be successfully described by a single framework. On the one hand, ... 
Optical properties of an atomic ensemble coupled to a band edge of a photonic crystal waveguide
(2017)We study the optical properties of an ensemble of twolevel atoms coupled to a 1D photonic crystal waveguide (PCW), which mediates longrange coherent dipole–dipole interactions between the atoms. We show that the longrange ... 
Stratification modelling of key bacterial taxa driven by metabolic dynamics in meromictic lakes
(2018)In meromictic lakes, the water column is stratified into distinguishable steady layers with different physicochemical properties. The bottom portion, known as monimolimnion, has been studied for the functional stratification ... 
Synchronization of a selfsustained coldatom oscillator
(2018)Nonlinear oscillations and synchronization phenomena are ubiquitous in nature. We study the synchronization of selfoscillating magnetooptically trapped cold atoms to a weak external driving. The oscillations arise from ... 
Cluster state generation in onedimensional Kitaev honeycomb model via shortcut to adiabaticity
(2018)We propose a mean to obtain computationally useful resource states also known as cluster states, for measurementbased quantum computation, via transitionless quantum driving algorithm. The idea is to cool the system to ... 
Scaling of geometric phase versus band structure in clusterIsing models
(2017)We study the phase diagram of a class of models in which a generalized cluster interaction can be quenched by an Ising exchange interaction and external magnetic field. The various phases are studied through winding numbers. ... 
Photon scattering by an atomic ensemble coupled to a onedimensional nanophotonic waveguide
(2017)We theoretically investigate the quantum scattering of a weak coherent input field interacting with an ensemble of Λtype threelevel atoms coupled to a onedimensional waveguide. With an effective nonHermitian Hamiltonian, ...