3,713 research outputs found
Simulating dynamical quantum Hall effect with superconducting qubits
We propose an experimental scheme to simulate the dynamical quantum Hall
effect and the related interaction-induced topological transition with a
superconducting-qubit array. We show that a one-dimensional Heisenberg model
with tunable parameters can be realized in an array of superconducting qubits.
The quantized plateaus, which is a feature of the dynamical quantum Hall
effect, will emerge in the Berry curvature of the superconducting qubits as a
function of the coupling strength between nearest neighbor qubits. We
numerically calculate the Berry curvatures of two-, four- and six-qubit arrays,
and find that the interaction-induced topological transition can be easily
observed with the simplest two-qubit array. Furthermore, we analyze some
practical conditions in typical experiments for observing such dynamical
quantum Hall effect.Comment: 9 pages, 6 figures, version accepted by PR
Study on Speed Characteristic of Material in Pipe Pneumatic Conveyor
AbstractFocusing on material kinetic characteristic in horizontal pipe and vertical pipe of pneumatic conveyor, motion differential equation of the particle groups in pipe is established and solved by introduced into Matlab. By analyzing the resistance coefficient of the particle groups in different pipes and speed characteristic curves in different initial conditions, the speed characteristic of the particle groups in accelerating section of the pipe in pneumatic conveyor is obtained. The result shows that (1) resistance coefficient affects ultimate constant velocity of the particle groups in pipe, (2) different initial conditions affect acceleration (deceleration) motion time of the particle groups in pipe and (3) the power consumed in vertical pipe is larger than that in horizontal pipe when the particle groups are in accelerating section
Demonstration of Geometric Landau-Zener Interferometry in a Superconducting Qubit
Geometric quantum manipulation and Landau-Zener interferometry have been
separately explored in many quantum systems. In this Letter, we combine these
two approaches to study the dynamics of a superconducting phase qubit. We
experimentally demonstrate Landau-Zener interferometry based on the pure
geometric phases in this solid-state qubit. We observe the interference caused
by a pure geometric phase accumulated in the evolution between two consecutive
Landau-Zener transitions, while the dynamical phase is canceled out by a
spin-echo pulse. The full controllability of the qubit state as a function of
the intrinsically robust geometric phase provides a promising approach for
quantum state manipulation.Comment: 5 pages + 3 pages supplemental Materia
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