Recent Submissions

  • Population mixing due to dipole-dipole interactions in a one-dimensional array of multilevel atoms 

    Munro, E.; Asenjo-Garcia, A.; Lin, Y.; Kwek, Leong Chuan; Regal, C. A.; Chang, D. E. (2018)
    We examine theoretically how dipole-dipole interactions arising from multiple photon scattering lead to a modified distribution of ground-state populations in a driven, ordered one-dimensional array of multilevel atoms. ...
  • Beating the Clauser-Horne-Shimony-Holt and the Svetlichny games with optimal states 

    Su, Hong-Yi; Ren, Changliang; Chen, Jing-Ling; Zhang, Fu-Lin; Wu, Chunfeng; Xu, Zhen-Peng; Gu, Mile; Vinjanampathy, Sai; Kwek, Leong Chuan (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 two-body correlations 

    Tan, Ernest Y.-Z.; Kaszlikowski, Dagomir; Kwek, Leong Chuan (2016)
    We construct an entanglement witness for many-qubit systems, based on symmetric two-body correlations with two measurement settings. This witness is able to detect the entanglement of some Dicke states for any number of ...
  • Charge-qubit–atom hybrid 

    Yu, Deshui; Valado, María Martínez; Hufnagel, Christoph; Kwek, Leong Chuan; Amico, Luigi; Dumke, Rainer (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 

    Song, Guo-Zhu; Munro, Ewan; Nie, Wei; Kwek, Leong-Chuan; Deng, Fu-Guo; Long, Gui-Lu (2018)
    We theoretically investigate the transport properties of a weak coherent input field scattered by an ensemble of Λ-type atoms coupled to a one-dimensional photonic crystal waveguide. In our model, the atoms are randomly ...
  • ‘A better life for all’ : prefigurative and strategic politics in Southern Africa 

    Swatuk, Larry A.; Vale, Peter (2016)
    Prefigurative politics is a resurgent concept, seeking to explain a diverse array of social phenomena, from Occupy Wall Street to car-sharing cooperatives. The driving force behind these activities is said to be a combination ...
  • Unified composite scenario for inflation and dark matter in the Nambu–Jona-Lasinio model 

    Channuie, Phongpichit; Xiong, Chi (2017)
    In this work, we propose a cosmological scenario inherently based on the effective Nambu–Jona-Lasinio (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 

    Munro, Ewan; Kwek, Leong Chuan; Chang, Darrick E. (2017)
    We study the optical properties of an ensemble of two-level atoms coupled to a 1D photonic crystal waveguide (PCW), which mediates long-range coherent dipole–dipole interactions between the atoms. We show that the long-range ...
  • Stratification modelling of key bacterial taxa driven by metabolic dynamics in meromictic lakes 

    Zhu, Kaicheng; Lauro, Federico M.; Su, Haibin (2018)
    In meromictic lakes, the water column is stratified into distinguishable steady layers with different physico-chemical properties. The bottom portion, known as monimolimnion, has been studied for the functional stratification ...
  • Synchronization of a self-sustained cold-atom oscillator 

    Heimonen, H.; Kwek, Leong Chuan; Kaiser, R.; Labeyrie, G. (2018)
    Nonlinear oscillations and synchronization phenomena are ubiquitous in nature. We study the synchronization of self-oscillating magneto-optically trapped cold atoms to a weak external driving. The oscillations arise from ...
  • Cluster state generation in one-dimensional Kitaev honeycomb model via shortcut to adiabaticity 

    Kyaw, Thi Ha; Kwek, Leong-Chuan (2018)
    We propose a mean to obtain computationally useful resource states also known as cluster states, for measurement-based quantum computation, via transitionless quantum driving algorithm. The idea is to cool the system to ...
  • Scaling of geometric phase versus band structure in cluster-Ising models 

    Nie, Wei; Mei, Feng; Amico, Luigi; Kwek, Leong Chuan (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 one-dimensional nanophotonic waveguide 

    Song, Guo-Zhu; Munro, Ewan; Nie, Wei; Deng, Fu-Guo; Yang, Guo-Jian; Kwek, Leong-Chuan (2017)
    We theoretically investigate the quantum scattering of a weak coherent input field interacting with an ensemble of Λ-type three-level atoms coupled to a one-dimensional waveguide. With an effective non-Hermitian Hamiltonian, ...
  • A feasible strategy to balance the crystallinity and specific surface area of metal oxide nanocrystals 

    Zhang, Q. P.; Xu, X. N.; Liu, Y. T.; Xu, M.; Deng, S. H.; Chen, Y.; Yuan, H.; Yu, F.; Huang, Y.; Zhao, K.; Xu, Shuyan; Xiong, G. (2017)
    Practical, efficient synthesis of metal oxide nanocrystals with good crystallinity and high specific surface area by a modified polymer-network gel method is demonstrated, taking ZnO nanocrystals as an example. A novel ...
  • Pseudo-topotactic conversion of carbon nanotubes to T-carbon nanowires under picosecond laser irradiation in methanol 

    Zhang, Jinying; Wang, Rui; Zhu, Xi; Pan, Aifei; Han, Chenxiao; Li, Xin; Dan Zhao; Ma, Chuansheng; Wang, Wenjun; Su, Haibin; Niu, Chunming (2017)
    Pseudo-topotactic conversion of carbon nanotubes into one-dimensional 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 

    Yu, Deshui; Landra, Alessandro; Kwek, Leong Chuan; Amico, Luigi; Dumke, Rainer (2018)
    We propose a superconducting circuit-atom 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 

    Sonar, Sameer; Hajdušek, Michal; Mukherjee, Manas; Fazio, Rosario; Vedral, Vlatko; Vinjanampathy, Sai; Kwek, Leong-Chuan (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 self-sustained oscillator. Several existing proposals ...
  • Focus on atomtronics-enabled quantum technologies 

    Amico, Luigi; Birkl, Gerhard; Boshier, Malcolm; Kwek, Leong-Chuan (2017)
    Atomtronics is an emerging field in quantum technology that promises to realize ‘atomic circuit’ architectures exploiting ultra-cold atoms manipulated in versatile micro-optical circuits generated by laser fields of different ...
  • Theoretical description of a micromaser in the ultrastrong-coupling regime 

    Yu, Deshui; Kwek, Leong Chuan; Amico, Luigi; Dumke, Rainer (2017)
    We theoretically investigate an ultrastrong-coupled micromaser based on Rydberg atoms interacting with a superconducting LC resonator, where the common rotating-wave approximation and slowly varying envelope approximation ...
  • Separability criteria with angular and Hilbert space averages 

    Fujikawa, Kazuo; Oh, Choo Hiap; Umetsu, Koichiro; Yu, Sixia (2016)
    The practically useful criteria of separable states ρ=∑k wkρk in d=2×2 are discussed. The equality G(a,b)=4[〈ψ|P(a)⊗P(b)|ψ〉−〈ψ|P(a)⊗1|ψ〉〈ψ|1⊗P(b)|ψ〉]=0 for any two projection operators P(a) and P(b) provides a necessary ...

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