Institute of Advanced Studies (IAS)
Recent Submissions

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, ... 
A feasible strategy to balance the crystallinity and specific surface area of metal oxide nanocrystals
(2017)Practical, efficient synthesis of metal oxide nanocrystals with good crystallinity and high specific surface area by a modified polymernetwork gel method is demonstrated, taking ZnO nanocrystals as an example. A novel ... 
Pseudotopotactic conversion of carbon nanotubes to Tcarbon nanowires under picosecond laser irradiation in methanol
(2017)Pseudotopotactic conversion of carbon nanotubes into onedimensional carbon nanowires is a challenging but feasible path to obtain desired diameters and morphologies. Here, a previously predicted but experimentally ... 
Stabilizing Rabi oscillation of a charge qubit via the atomic clock technique
(2018)We propose a superconducting circuitatom hybrid, where the Rabi oscillation of single excess Cooper pair in the island is stabilized via the common atomic clock technique. The noise in the superconducting circuit is mapped ... 
Squeezing Enhances Quantum Synchronization
(2018)It is desirable to observe synchronization of quantum systems in the quantum regime, defined by the low number of excitations and a highly nonclassical steady state of the selfsustained oscillator. Several existing proposals ... 
Focus on atomtronicsenabled quantum technologies
(2017)Atomtronics is an emerging field in quantum technology that promises to realize ‘atomic circuit’ architectures exploiting ultracold atoms manipulated in versatile microoptical circuits generated by laser fields of different ... 
Theoretical description of a micromaser in the ultrastrongcoupling regime
(2017)We theoretically investigate an ultrastrongcoupled micromaser based on Rydberg atoms interacting with a superconducting LC resonator, where the common rotatingwave approximation and slowly varying envelope approximation ... 
Separability criteria with angular and Hilbert space averages
(2016)The practically useful criteria of separable states ρ=∑k wkρk in d=2×2 are discussed. The equality G(a,b)=4[〈ψP(a)⊗P(b)ψ〉−〈ψP(a)⊗1ψ〉〈ψ1⊗P(b)ψ〉]=0 for any two projection operators P(a) and P(b) provides a necessary ...