Fast Error Correction of Codeword-Stabilized Quantum Codes (2009)
Li, Yunfan, Dumer, Ilya, Pryadko, Leonid P.
Codeword stabilized (CWS) codes are nonlinear quantum codes that can correct errors by an exhaustive search similar to classical nonlinear codes. This brute-force approach also requires nonlocal...
Soft-Pulse Dynamical Decoupling with Markovian Decoherence (2009)
Pryadko, Leonid P., Quiroz, Gregory
We consider the effect of broadband decoherence on the performance of refocusing sequences, having in mind applications of dynamical decoupling in concatenation with quantum error correcting codes as...
Attachment and detachment rate distributions in deep-bed filtration (2009)
Lin, Hsiang-Ku, Pryadko, Leonid P., Walker, Sharon, Zandi, Roya
We study the transport and deposition dynamics of colloids in saturated porous media under unfavorable filtering conditions. As an alternative to traditional convection-diffusion or more detailed...
Second-order shaped pulses for solid-state quantum computation (2008)
Pryadko, Leonid P., Sengupta, Pinaki
We present the constructon and detailed analysis of highly-optimized self-refocusing pulse shapes for several rotation angles. We characterize the constructed pulses by the coefficients appearing in...
Soft-pulse dynamical decoupling in a cavity (2007)
Pryadko, Leonid P., Quiroz, Gregory
Dynamical decoupling is a coherent control technique where the intrinsic and extrinsic couplings of a quantum system are effectively averaged out by application of specially designed driving fields...
Refocusing of a qubit system coupled to an oscillator (2007)
Pryadko, Leonid P., Quiroz, Gregory
Refocusing, or dynamical decoupling, is a coherent control technique where the internal dynamics of a quantum system is effectively averaged out by an application of specially designed driving...
Coherence of a Josephson phase qubit under partial-collapse measurement (2007)
Pryadko, Leonid P., Korotkov, Alexander N.
We discuss quantum evolution of a decaying state in relation to a recent experiment of Katz et al. Based on exact analytical and numerical solutions of a simple model, we identify a regime where...
Heterogeneities and Topological Defects in Two-Dimensional Pinned Liquids (2006)
Reichhardt, C., Nussinov, Z., Pryadko, Leonid P., Reichhardt, C. J. Olson
We simulate a model of repulsively interacting colloids on a commensurate two-dimensional triangular pinning substrate where the amount of heterogeneous motion that appears at melting can be...
Quantum degenerate Bose-Fermi mixtures on 1-D optical lattices (2005)
Sengupta, Pinaki, Pryadko, Leonid P.
We combine model mapping, exact spectral bounds, and a quantum Monte Carlo method to study the ground state phases of a mixture of ultracold bosons and spin-polarized fermions in a one-dimensional...
Supersolids versus phase separation in two-dimensional lattice bosons (2005)
Sengupta, Pinaki, Pryadko, Leonid P., Alet, Fabien, Troyer, Matthias, Schmid, Guido
We study the nature of the ground state of the strongly-coupled two dimensional extended boson Hubbard model on a square lattice. We demonstrate that strong but finite on-site interaction U along...
Quantum kinetics of refocusing (2005)
Pryadko, Leonid P., Sengupta, Pinaki
We consider quantum kinetics of an open quantum system in the presence of periodic fields designed to suppress the internal evolution and shield the system from generic low-frequency environment...
Quantum phase slips in the presence of finite-range disorder (2005)
Khlebnikov, S., Pryadko, Leonid P.
To study the effect of disorder on quantum phase slips (QPS) in superconducting wires, we consider the plasmon-only model where disorder can be incorporated into a first-principles instanton...
Scalable design of tailored soft pulses for coherent control (2005)
Sengupta, Pinaki, Pryadko, Leonid P.
We present a scalable scheme to design optimized soft pulses and pulse sequences for coherent control of interacting quantum many-body systems. The scheme is based on the cluster expansion and the...
Supersolids versus phase separation in two-dimensional lattice bosons (2004)
Sengupta, Pinaki, Pryadko, Leonid P., Alet, Fabien, Troyer, Matthias, Schmid, Guido
We study the nature of the ground state of the strongly-coupled two dimensional extended boson Hubbard model on a square lattice. We demonstrate that strong but finite on-site interaction U along...
Driven classical diffusion with strong correlated disorder (2004)
Pryadko, Leonid P., Lin, Jing-Xian
We analyze one-dimensional motion of an overdamped classical particle in the presence of external disorder potential and an arbitrary driving force F. In thermodynamical limit the effective...
Supersolids versus phase separation in two-dimensional lattice bosons (2004)
Sengupta, Pinaki, Pryadko, Leonid P., Alet, Fabien, Troyer, Matthias, Schmid, Guido
We study the nature of the ground state of the strongly-coupled two dimensional extended boson Hubbard model on a square lattice. We demonstrate that strong but finite on-site interaction U along...
Supersolids versus phase separation in two-dimensional lattice bosons (2004)
Sengupta, Pinaki, Pryadko, Leonid P., Alet, Fabien, Troyer, Matthias, Schmid, Guido
We study the nature of the ground state of the strongly-coupled two dimensional extended boson Hubbard model on a square lattice. We demonstrate that strong but finite on-site interaction U along...
Incipient order in the t-J model at high temperatures (2003)
Pryadko, Leonid P., Kivelson, Steven A., Zachar, Oron
We analyze the high-temperature behavior of the susceptibilities towards a number of possible ordered states in the t-J-V model using the high-temperature series expansion. From all diagrams with up...
Low-frequency conductivity of a non-degenerate 2D electron liquid in strong magnetic fields (2003)
Dykman, M. I., Pryadko, Leonid P.
We study the conductivity of a nondegenerate 2D electron liquid in a quantizing magnetic field for frequencies well below the cyclotron frequency. The conductivity is formed by electron transitions...
Kuehnel, Frank, Pryadko, Leonid P., Dykman, M. I.
We study transport properties of a non-degenerate two-dimensional system of non-interacting electrons in the presence of a quantizing magnetic field and a short-range disorder potential. We show that...
Notes on Infinite Layer Quantum Hall Systems (2000)
Naud, J. D., Pryadko, Leonid P., Sondhi, S. L.
We study the fractional quantum Hall effect in three dimensional systems consisting of infinitely many stacked two dimensional electron gases placed in transverse magnetic fields. This limit...
The fractional quantum Hall effect in infinite layer systems (2000)
Naud, J. D., Pryadko, Leonid P., Sondhi, S. L.
Stacked two dimensional electron systems in transverse magnetic fields exhibit three dimensional fractional quantum Hall phases. We analyze the simplest such phases and find novel bulk properties,...
Edge Dynamics in Quantum Hall Bilayers II: Exact Results with Disorder and Parallel Fields (2000)
Naud, J. D., Pryadko, Leonid P., Sondhi, S. L.
We study edge dynamics in the presence of interlayer tunneling, parallel magnetic field, and various types of disorder for two infinite sequences of quantum Hall states in symmetric bilayers. These...
Low-frequency peak in the magnetoconductivity of a non-degenerate 2D electron liquid (2000)
Kuehnel, Frank, Pryadko, Leonid P., Dykman, M. I.
We study the frequency-dependent magnetoconductivity of a strongly correlated nondegenerate 2D electron system in a quantizing magnetic field. We first restore the single-electron conductivity from...
Holons on a meandering stripe: quantum numbers (2000)
Tchernyshyov, Oleg, Pryadko, Leonid P.
We attempt to access the regime of strong coupling between charge carriers and transverse dynamics of an isolated conducting ``stripe'', such as those found in cuprate superconductors. A stripe is...
Search for effective models of stripes in the cuprates (1999)
Tchernyshyov, Oleg, Pryadko, Leonid P.
We argue that effective 1D models of stripes in the cuprate superconductors can be constructed by studying ground states and elementary excitations of domain walls in 2D model antiferromagnets. This...
Coulomb interactions and delocalization in quantum Hall constrictions (1999)
Pryadko, Leonid P., Shimshoni, Efrat, Auerbach, Assa
We study a geometry-dependent effect of long-range Coulomb interactions on quantum Hall (QH) tunneling junctions. In an X-shaped geometry, duality relates junctions with opening angles alpha and (pi...
Intersecting Loop Models on Z^D: Rigorous Results (1999)
Chayes, L., Pryadko, Leonid P., Shtengel, Kirill
We consider a general class of (intersecting) loop models in D dimensions, including those related to high-temperature expansions of well-known spin models. We find that the loop models exhibit some...
Quantum Hall Bilayers and the Chiral Sine-Gordon Equation (1999)
Naud, J. D., Pryadko, Leonid P., Sondhi, S. L.
The edge state theory of a class of symmetric double-layer quantum Hall systems with interlayer electron tunneling reduces to the sum of a free field theory and a field theory of a chiral Bose field...
Holons on a meandering stripe (1999)
Tchernyshyov, Oleg, Pryadko, Leonid P.
To study a possible effect of transverse fluctuations of a stripe in a 2D antiferromagnet on its charge dynamics, we identify elementary excitations of a weakly doped domain wall in the Hubbard...
Topological doping and the stability of stripe phases (1999)
Pryadko, Leonid P., Kivelson, Steven A., Emery, V. J., Bazaliy, Yaroslaw B., Demler, Eugene A.
We analyze the properties of a general Ginzburg-Landau free energy with competing order parameters, long-range interactions, and global constraints (e.g., a fixed value of a total ``charge'') to...
Hall Resistivity and Dephasing in the Quantum Hall Insulator (1998)
Pryadko, Leonid P., Auerbach, Assa
The longstanding problem of the Hall resistivity rho(x,y) in the Hall insulator phase is addressed using four-lead Chalker-Coddington networks. Electron interaction effects are introduced via a...
Instability of charge ordered states in doped antiferromagnets (1997)
Pryadko, Leonid P., Kivelson, Steven, Hone, Daniel W.
We analyze the induced interactions between localized holes in weakly-doped Heisenberg antiferromagnets due to the modification of the quantum zero point spin wave energy; i.e. the analogue of the...
Network of edge states: random Josephson junction array description (1997)
Pryadko, Leonid P., Chaltikian, Karen
We construct a generalization of the Chalker-Coddington network model to the case of fractional quantum Hall effect, which describes the tunneling between multiple chiral edges. We derive exact local...
Global symmetries of quantum Hall systems: lattice description (1997)
I analyze non-local symmetries of finite-size Euclidean 3D lattice Chern-Simons models in the presence of an external magnetic field and non-zero average current. It is shown that under very general...
Studies of quantum phase transitions in the Chern-Simons-Landau-Ginzburg model / (1996)
Submitted to the Department of Physics.
Duality and Universality for the Chern-Simons bosons (1995)
Pryadko, Leonid P., Zhang, Shou-Cheng
By mapping the relativistic version of the Chern-Simons-Landau-Ginzburg theory in 2+1 dimensions to the 3D lattice Villain x-y model coupled with the Chern-Simons gauge field, we investigate phase...