Recent Submissions

  • 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 ...
  • Fast non-Abelian geometric gates via transitionless quantum driving 

    Zhang, J.; Kyaw, Thi Ha; Tong, D. M.; Sjöqvist, Erik; Kwek, Leong-Chuan (2015-12-21)
    A practical quantum computer must be capable of performing high fidelity quantum gates on a set of quantum bits (qubits). In the presence of noise, the realization of such gates poses daunting challenges. Geometric phases, ...
  • GdN thin film: Chern insulating state on square lattice 

    Li, Zhi; Kim, Jinwoong; Kioussis, Nicholas; Ning, Shu-Yu; Su, Haibin; Iitaka, Toshiaki; Tohyama, Takami; Yang, Xinyu; Zhang, Jiu-Xing (2015-11-10)
    Using first-principles calculations, we predict a Chern insulating phase in thin films of the ferromagnetic semimetal GdN. In contrast to previously proposed Chern insulator candidates, which mostly rely on honeycomb ...
  • Electronic structure of the antiferromagnetic topological insulator candidate GdBiPt 

    Li, Zhi; Su, Haibin; Yang, Xinyu; Zhang, Jiuxing (2015-06-15)
    We studied the electronic structures of antiferromagnetic (AFM) GdBiPt with propagating vectors Q1⃗ =(0,0,π) (A-type) and Q2⃗ =(π,π,π) (G-type) by performing first-principles calculation based on density-functional theory ...
  • Simulation and detection of photonic Chern insulators in a one-dimensional circuit-QED lattice 

    Mei, Feng; You, Jia-Bin; Nie, Wei; Fazio, Rosario; Zhu, Shi-Liang; Kwek, Leong Chuan (2015-10-12)
    We introduce a conceptually simple and experimentally feasible method to realize and detect photonic topological Chern insulators with a one-dimensional circuit quantum electrodynamics lattice. By periodically modulating ...
  • Half-skyrmion and vortex-antivortex pairs in spinor condensates 

    Hu, Yu-Xin; Miniatura, Christian; Grémaud, Benoît (2015-09-17)
    We propose a simple experimental scheme to generate spin textures in the ground state of interacting ultracold bosonic atoms loaded in a two-dimensional harmonic trap. Our scheme is based on two copropagating Laguerre-Gauss ...
  • Triangular and honeycomb lattices of cold atoms in optical cavities 

    Safaei, Shabnam; Miniatura, Christian; Grémaud, Benoît (2015-10-08)
    We consider a two-dimensional homogeneous ensemble of cold bosonic atoms loaded inside two optical cavities and pumped by a far-detuned external laser field. We examine the conditions for these atoms to self-organize into ...
  • Electronic Properties of Fluoride and Half–fluoride Superlattices KZnF3/KAgF3 and SrTiO3/KAgF3 

    Yang, Xiaoping; Su, Haibin (2015-10-30)
    We present the formation of cupratelike electronic structures in KAgF3–related superlattices resulted from the confinement together with structural chemical modification by using the generalized gradient approximation ...

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