Browsing by Author "Baranger, HU"
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Bound on quantum computation time: Quantum error correction in a critical environment
Novais, E; Mucciolo, ER; Baranger, HU (Physical Review A  Atomic, Molecular, and Optical Physics, 20100831)We obtain an upper bound on the time available for quantum computation for a given quantum computer and decohering environment with quantum error correction implemented. First, we derive an explicit quantum evolution operator ... 
Conductance of quantum impurity models from quantum monte carlo
Liu, D; Chandrasekharan, S; Baranger, HU (Physical Review B  Condensed Matter and Materials Physics, 20101028)The conductance of two Anderson impurity models, one with twofold and another with fourfold degeneracy, representing two types of quantum dots, is calculated using a worldline quantum Monte Carlo (QMC) method. Extrapolation ... 
Observation of majorana quantum critical behaviour in a resonant level coupled to a dissipative environment
Mebrahtu, HT; Borzenets, IV; Zheng, H; Bomze, YV; Smirnov, AI; Florens, S; Baranger, HU; ... (8 authors) (Nature Physics, 20130101)A quantum phase transition is an abrupt change between two distinct ground states of a manybody system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a ... 
Observation of Majorana quantum critical behaviour in a resonant level coupled to a dissipative environment
Mebrahtu, HT; Borzenets, IV; Zheng, H; Bomze, YV; Smirnov, AI; Florens, S; Baranger, HU; ... (8 authors) (Nature Physics, 2013)A quantum phase transition is an abrupt change between two distinct ground states of a manybody system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a ... 
Photon correlations generated by inelastic scattering in a onedimensional waveguide coupled to threelevel systems
Fang, YLL; Baranger, HU (Physica E: LowDimensional Systems and Nanostructures, 20160401)© 2015 Elsevier B.V. All rights reserved.We study photon correlations generated by scattering from threelevel systems (3LS) in one dimension. The two systems studied are a 3LS in a semiinfinite waveguide (3LS plus a mirror) ... 
Timedependent transport through molecular junctions.
Ke, SH; Liu, R; Yang, W; Baranger, HU (J Chem Phys, 20100621)We investigate transport properties of molecular junctions under two types of biasa short time pulse or an ac biasby combining a solution for Green's functions in the time domain with electronic structure information ... 
Tunable quantum phase transitions in a resonant level coupled to two dissipative baths
Liu, DE; Zheng, H; Finkelstein, G; Baranger, HU (Physical Review B  Condensed Matter and Materials Physics, 20140218)We study tunneling through a resonant level connected to two dissipative bosonic baths: one is the resistive environment of the source and drain leads, while the second comes from coupling to potential fluctuations on a ... 
Twostage Kondo effect and Kondobox level spectroscopy in a carbon nanotube
Bomze, Y; Borzenets, I; Mebrahtu, H; Makarovski, A; Baranger, HU; Finkelstein, G (Physical Review B  Condensed Matter and Materials Physics, 20101018)The concept of the "Kondo box" describes a single spin, antiferromagnetically coupled to a quantum dot with a finite level spacing. Here, a Kondo box is formed in a carbon nanotube interacting with a localized electron. ... 
Universal Nonequilibrium IV Curve at an Interacting Impurity Quantum Critical Point
Zhang, G; Chung, CH; Ke, CT; Lin, CY; Mebrahtu, H; Smirnov, AI; Finkelstein, G; ... (8 authors) (arXiv, 201609)The nonlinear IV curve at an interacting quantum critical point (QCP) is typically out of reach theoretically. Here, however, we provide an analytical calculation of the IV curve at a QCP under nonequilibrium conditions ... 
Waveguide QED: Manybody boundstate effects in coherent and Fockstate scattering from a twolevel system
Zheng, H; Gauthier, DJ; Baranger, HU (Physical Review A  Atomic, Molecular, and Optical Physics, 20101214)Strong coupling between a twolevel system (TLS) and bosonic modes produces dramatic quantum optics effects. We consider a onedimensional continuum of bosons coupled to a single localized TLS, a system which may be realized ...