25,883 research outputs found
Development of Urban Electric Bus Drivetrain
The development of the drivetrain for a new series of urban electric buses is presented in the paper. The traction and design properties of several drive variants are compared. The efficiency of the drive was tested using simulation calculations of the vehicle rides based on data from real bus lines in Prague. The results of the design work and simulation calculations are presented in the paper
Non-classical computing: feasible versus infeasible
Physics sets certain limits on what is and is not computable. These limits are very far from having been reached by current technologies. Whilst proposals for hypercomputation are almost certainly infeasible, there are a number of non classical approaches that do hold considerable promise. There are a range of possible architectures that could be implemented on silicon that are distinctly different from the von Neumann model. Beyond this, quantum simulators, which are the quantum equivalent of analogue computers, may be constructable in the near future
Deterministic creation of entangled atom-light Schr\"odinger-cat states
Quantum physics allows for entanglement between microscopic and macroscopic
objects, described by discrete and continuous variables, respectively. As in
Schr\"odinger's famous cat gedanken experiment, a box enclosing the objects can
keep the entanglement alive. For applications in quantum information
processing, however, it is essential to access the objects and manipulate them
with suitable quantum tools. Here we reach this goal and deterministically
generate entangled light-matter states by reflecting a coherent light pulse
with up to four photons on average from an optical cavity containing one atom.
The quantum light propagates freely and reaches a remote receiver for quantum
state tomography. We produce a plethora of quantum states and observe
negative-valued Wigner functions, a characteristic sign of non-classicality. As
a first application, we demonstrate a quantum-logic gate between an atom and a
light pulse, with the photonic qubit encoded in the phase of the light field.Comment: includes Methods and Supplementary Informatio
Computer hardware and software for robotic control
The KSC has implemented an integrated system that coordinates state-of-the-art robotic subsystems. It is a sensor based real-time robotic control system performing operations beyond the capability of an off-the-shelf robot. The integrated system provides real-time closed loop adaptive path control of position and orientation of all six axes of a large robot; enables the implementation of a highly configurable, expandable testbed for sensor system development; and makes several smart distributed control subsystems (robot arm controller, process controller, graphics display, and vision tracking) appear as intelligent peripherals to a supervisory computer coordinating the overall systems
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