Tag: 宜春桑拿

Nimba United Hosts Union Douala Sunday

first_imgLiberia’s football giant, Nimba United FC is expected to host Cameroon runner-up champs Union Douala, at the Antoinette Tubman Stadium (ATS) in Monrovia on Sunday, February 14, at 4:00pm. The game is the first phase of the CAF Champions League.On Sunday, February 28, the LFA 2015 football champs is expected to play the return-leg (the second phase) at Stade de la Reunification in Douala, Cameroon. Both teams are meeting for the first time in the CAF Champions League but Union Douala is not new to Liberia. They had previously played LISCR FC here in Monrovia in previous CAF competition and sent the home side out of the league.Union Douala , founded in 1958 and is in the Cameroon Premiere Division, is expected to arrive in Monrovia today for the Sunday’s match. The 2016 CAF Champions League officially the 2016 Orange CAF Champions League for the purpose of sponsorship, will be the 52nd edition of Africa’s premier club football tournament organized by the Confederation of African Football.The league is the 20th edition under the current CAF Champions League format, and winner will qualify for the 2016 FIFA Club World Cup, would automatically make them eligible to participate in the All 56 CAF associations.The 2016 CAF Champions League is adapting the 2010-2014 CAF 5-Year Ranking, which calculates points for each entrant association based on clubs’ performance over the five years in the CAF Champions League and CAF Confederation Cup.Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)last_img read more

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A chip that allows for twodimensional quantum walks

first_img © 2018 Phys.org A team of researchers from Shanghai Jiao Tong University and the University of Science and Technology of China has developed a chip that allows for two-dimensional quantum walks of single photons on a physical device. In their paper published on the open access site, Science Advances the group describes the chip and why they believe developing it was important. Explore further Largest-ever 3-D quantum chip for boosting analog quantum computing Citation: A chip that allows for two-dimensional quantum walks (2018, May 14) retrieved 18 August 2019 from https://phys.org/news/2018-05-chip-two-dimensional-quantum.html The quantum chip with waveguide structures visible. Credit: Xianmin Jin The quantum chip with waveguide structures visible. Credit: Xianmin Jin Journal information: Science Advances More information: Hao Tang et al. Experimental two-dimensional quantum walk on a photonic chip, Science Advances (2018). DOI: 10.1126/sciadv.aat3174AbstractQuantum walks, in virtue of the coherent superposition and quantum interference, have exponential superiority over their classical counterpart in applications of quantum searching and quantum simulation. The quantum-enhanced power is highly related to the state space of quantum walks, which can be expanded by enlarging the photon number and/or the dimensions of the evolution network, but the former is considerably challenging due to probabilistic generation of single photons and multiplicative loss. We demonstrate a two-dimensional continuous-time quantum walk by using the external geometry of photonic waveguide arrays, rather than the inner degree of freedoms of photons. Using femtosecond laser direct writing, we construct a large-scale three-dimensional structure that forms a two-dimensional lattice with up to 49 × 49 nodes on a photonic chip. We demonstrate spatial two-dimensional quantum walks using heralded single photons and single photon–level imaging. We analyze the quantum transport properties via observing the ballistic evolution pattern and the variance profile, which agree well with simulation results. We further reveal the transient nature that is the unique feature for quantum walks of beyond one dimension. An architecture that allows a quantum walk to freely evolve in all directions and at a large scale, combining with defect and disorder control, may bring up powerful and versatile quantum walk machines for classically intractable problems. Play The fabrication of a quantum chip using femtosecond laser direct writing technique. Credit: Xianmin Jin The three-dimensional chip, the team reports, was created using a technique called femtosecond writing. It uses the external geometry of photonic waveguide arrays as a means for carrying out the quantum walks using a single photon. They note also that they tested the chip by observing patterns and variance profiles and comparing them to simulation studies. They suggest further that in addition to making progress toward a truly useful quantum computer, the chip could also be used to boost the performance of analog quantum computing or quantum simulators.If researchers can create quantum computers with very large, or even unlimited size grids, it might be possible to create and use networks as complex as the human nervous system. PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Quantum walks are the quantum version of classical random walks, which are a mathematical means for describing a natural random walk, e.g., simply wandering around randomly. To describe such walks, mathematicians and computer scientists use probability distribution grids that show a current position and possible next steps. Quantum walks are used to build models that depict randomly grown, sophisticated and complex networks such as the human neural network. They can also be used to create networks for actual use in applications, and might one day be used in quantum-based robots.As the researchers note, a quantum computer should provide exponential advantages over classical systems due to their nature. To that end, scientists have been working to implement quantum walks in a physical machine as part of developing a truly useful quantum computer. In this new effort, the researchers report that they have developed a chip that carries out quantum walks on a two-dimensional 49×49 grid—the largest created so far by any team. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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