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  • 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 ...
  • Orbital-dependent Electron-Hole Interaction in Graphene and Associated Multi-Layer Structures 

    Deng, Tianqi; Su, Haibin (2015-11-27)
    We develop an orbital-dependent potential to describe electron-hole interaction in materials with structural 2D character, i.e. quasi-2D materials. The modulated orbital-dependent potentials are also constructed with ...
  • Characterization of a novel endoglucanase from Ganoderma lucidum 

    Manavalan, Tamilvendan; Manavalan, Arulmani; Thangavelu, Kalaichelvan P.; Heese, Klaus (2015)
    We evaluated the production and characterization of endoglucanase from Ganoderma lucidum using different lignocellulose biomasses. We purified a novel carboxymethyl cellulose (CMC) hydrolyzing endoglucanase from the white-rot ...
  • Beyond Gisin’s theorem and its applications : violation of local realism by two-party Einstein-Podolsky-Rosen steering 

    Chen, Jing-Ling; Su, Hong-Yi; Xu, Zhen-Peng; Wu, Yu-Chun; Wu, Chunfeng; Ye, Xiang-Jun; Żukowski, Marek; Kwek, Leong Chuan (2015)
    We demonstrate here that for a given mixed multi-qubit state if there are at least two observers for whom mutual Einstein-Podolsky-Rosen steering is possible, i.e. each observer is able to steer the other qubits into two ...
  • Coherent superposition of current flows in an atomtronic quantum interference device 

    Aghamalyan, Davit; Cominotti, Marco; Rizzi, Matteo; Rossini, Davide; Hekking, Frank; Minguzzi, Anna; Kwek, Leong-Chuan; Amico, Luigi (2015)
    We consider a correlated Bose gas tightly confined into a ring shaped lattice, in the presence of an artificial gauge potential inducing a persistent current through it. A weak link painted on the ring acts as a source of ...
  • Scalable quantum memory in the ultrastrong coupling regime 

    Kyaw, T. H.; Felicetti, S.; Romero, G.; Solano, E.; Kwek, Leong Chuan (2015)
    Circuit quantum electrodynamics, consisting of superconducting artificial atoms coupled to on-chip resonators, represents a prime candidate to implement the scalable quantum computing architecture because of the presence ...
  • Contribution of radicals and ions in catalyzed growth of single-walled carbon nanotubes from low-temperature plasmas 

    Marvi, Z.; Xu, S.; Foroutan, G.; Ostrikov, K. (2015)
    The growth kinetics of single-walled carbon nanotubes (SWCNTs) in a low-temperature, low-pressure reactive plasma is investigated using a multiscale numerical simulation, including the plasma sheath and surface diffusion ...
  • Creation of quantum error correcting codes in the ultrastrong coupling regime 

    Kyaw, T. H.; Herrera-Martí, D. A.; Solano, E.; Romero, G.; Kwek, Leong Chuan (2015)
    We propose to construct large quantum graph codes by means of superconducting circuits working at the ultrastrong coupling regime. In this physical scenario, we are able to create a cluster state between any pair of qubits ...
  • Z2 quantum memory implemented on circuit quantum electrodynamics 

    Kyaw, T. H.; Felicetti, S.; Romero, G.; Solano, E.; Kwek, Leong Chuan (2014)
    We present a technique to store and retrieve single- and two-qubit states into a parity-protected quantum memory implemented on a state-of-the-art superconducting circuit architecture. Our proposal relies upon a specific ...
  • Topological insulator and particle pumping in a one-dimensional shaken optical lattice 

    Mei, Feng; You, Jia-Bin; Zhang, Dan-Wei; Yang, X. C.; Fazio, R.; Zhu, Shi-Liang; Kwek, L. C. (2014)
    We propose a simple method to simulate and detect topological insulators with cold atoms trapped in a one-dimensional bichromatic optical lattice subjected to a time-periodic modulation. The tight-binding form of this ...
  • Relativistic superfluidity and vorticity from the nonlinear Klein-Gordon equation 

    Xiong, Chi; Good, Michael R. R.; Guo, Yulong; Liu, Xiaopei; Huang, Kerson (2014)
    We investigate superfluidity, and the mechanism for creation of quantized vortices, in the relativistic regime. The general framework is a nonlinear Klein-Gordon equation in curved spacetime for a complex scalar field, ...

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