230 research outputs found
Strong convergence of inertial extragradient algorithms for solving variational inequalities and fixed point problems
The paper investigates two inertial extragradient algorithms for seeking a
common solution to a variational inequality problem involving a monotone and
Lipschitz continuous mapping and a fixed point problem with a demicontractive
mapping in real Hilbert spaces. Our algorithms only need to calculate the
projection on the feasible set once in each iteration. Moreover, they can work
well without the prior information of the Lipschitz constant of the cost
operator and do not contain any line search process. The strong convergence of
the algorithms is established under suitable conditions. Some experiments are
presented to illustrate the numerical efficiency of the suggested algorithms
and compare them with some existing ones.Comment: 25 pages, 12 figure
Toward demonstrating controlled-X operation based on continuous variable four-partite cluster state and quantum teleporters
One-way quantum computation based on measurement and multipartite cluster
entanglement offers the ability to perform a variety of unitary operations only
through different choices of measurement bases. Here we present an experimental
study toward demonstrating the controlled-X operation, a two-mode gate, in
which continuous variable (CV) four-partite cluster states of optical modes are
utilized. Two quantum teleportation elements are used for achieving the gate
operation of the quantum state transformation from input target and control
states to output states. By means of the optical cluster state prepared
off-line, the homodyne detection and electronic feeding forward, the
information carried by the input control state is transformed to the output
target state. The presented scheme of the controlled-X operation based on
teleportation can be implemented nonlocally and deterministically. The
distortion of the quantum information resulting from the imperfect cluster
entanglement is estimated with the fidelity
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Tune measurement methods of the Tevatron
We will discuss several methods for measuring the tunes in the Tevatron. These methods can be separated into three classes: active, passive and hybrid. In the active method, the beam is tickled in order to obtain a frequency response. In the passive method, a Schottky detector which uses a resonant stripline is used to measure the Schottky spectrum of the beam. In the hybrid method, we tickle the beam using kickers, or the Tevatron Electron Lens (TEL) in order to bring the tune signal above the noise floor of the Schottky detectors. An automatic tune fitting algorithm is also under development which allows us to measure the tune without human intervention
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