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Search Results: 1 - 10 of 657424 matches for " J. A. Jones "
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NMR Quantum Computation: a Critical Evaluation
J. A. Jones
Physics , 2000, DOI: 10.1002/1521-3978(200009)48:9/11<909::AID-PROP909>3.0.CO;2-2
Abstract: Liquid state nuclear magnetic resonance (NMR) techniques have produced some spectacular successes in the construction of small quantum computers, and NMR is currently by far the leading technology for quantum computation. There are, however, a number of significant problems with any attempt to scale up the technology to produce computers of any useful size. While it is probable that some of these will be successfully sidestepped during the next few years, it is unlikely that they will all be solved; thus current liquid state NMR techniques are unlikely to provide a viable technology for practical quantum computation.
Quantum Computing and Nuclear Magnetic Resonance
J. A. Jones
Physics , 2001, DOI: 10.1039/b103231n
Abstract: Quantum information processing is the use of inherently quantum mechanical phenomena to perform information processing tasks that cannot be achieved using conventional classical information technologies. One famous example is quantum computing, which would permit calculations to be performed that are beyond the reach of any conceivable conventional computer. Initially it appeared that actually building a quantum computer would be extremely difficult, but in the last few years there has been an explosion of interest in the use of techniques adapted from conventional liquid state nuclear magnetic resonance (NMR) experiments to build small quantum computers. After a brief introduction to quantum computing I will review the current state of the art, describe some of the topics of current interest, and assess the long term contribution of NMR studies to the eventual implementation of practical quantum computers capable of solving real computational problems.
NMR Quantum Computation
J. A. Jones
Physics , 2000,
Abstract: In this article I will describe how NMR techniques may be used to build simple quantum information processing devices, such as small quantum computers, and show how these techniques are related to more conventional NMR experiments.
Comment on "NMR Experiment Factors Numbers with Gauss Sums"
J. A. Jones
Physics , 2007,
Abstract: Mehring et al. have recently described an elegant nuclear magnetic resonance (NMR) experiment implementing an algorithm to factor numbers based on the properties of Gauss sums. Similar experiments have also been described by Mahesh et al. In fact these algorithms do not factor numbers directly, but rather check whether a trial integer $\ell$ is a factor of a given integer $N$. Here I show that these NMR schemes cannot be used for factor checking without first implicitly determining whether or not $\ell$ is a factor of $N$.
Sea-spray geoengineering in the HadGEM2-ES earth-system model: radiative impact and climate response
A. Jones,J. M. Haywood
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2012,
Abstract: The radiative impact and climate effects of geoengineering using sea-spray aerosols have been investigated in the HadGEM2-ES Earth system model using a fully prognostic treatment of the sea-spray aerosols and also including their direct radiative effect. Two different emission patterns were considered, one to maximise the direct effect in clear skies, the other to maximise the indirect effects of the sea-spray on low clouds; in both cases the emissions were limited to 10% of the ocean area. While the direct effect was found to be significant, the indirect effects on clouds were much more effective in reducing global mean temperature as well as having less of an impact on global mean precipitation per unit temperature reduction. The impact on the distribution of precipitation was found to be similar in character, but less in degree, to that simulated by a previous study using a much simpler treatment of this geoengineering process.
Approximate quantum counting on an NMR ensemble quantum computer
J. A. Jones,M. Mosca
Physics , 1998, DOI: 10.1103/PhysRevLett.83.1050
Abstract: We demonstrate the implementation of a quantum algorithm for estimating the number of matching items in a search operation using a two qubit nuclear magnetic resonance (NMR) quantum computer.
Efficient Refocussing of One Spin and Two Spin Interactions for NMR Quantum Computation
J. A. Jones,E. Knill
Physics , 1999, DOI: 10.1006/jmre.1999.1890
Abstract: The use of spin echoes to refocus one spin interactions (chemical shifts) and two spin interactions (spin-spin couplings) plays a central role in both conventional NMR experiments and NMR quantum computation. Here we describe schemes for efficient refocussing of such interactions in both fully and partially coupled spin systems.
Implementation of a Quantum Algorithm to Solve Deutsch's Problem on a Nuclear Magnetic Resonance Quantum Computer
J. A. Jones,M. Mosca
Physics , 1998, DOI: 10.1063/1.476739
Abstract: We demonstrate the use of an NMR quantum computer based on the pyrimidine base cytosine, and the implementation of a quantum algorithm to solve Deutsch's problem.
Poroid Hidradenoma: Case Report and Excision Rationale  [PDF]
J. Arwyn-Jones, N. O’Hara, A. De Leo, J. Birch
Journal of Cancer Therapy (JCT) , 2016, DOI: 10.4236/jct.2016.74028
Abstract: Poroid hidradenoma is a benign eccrine neoplasm of the poroma family. We report a 65-year-old male patient who presented to his general practitioner with a poroid hidradenoma in zone 2 of the flexor surface of his left middle finger. Diagnosis was confirmed histologically, after which the patient was referred to us for wider excision. Although poroid hidradenoma is a benign tumour, wide local excision is mandatory. Here we discuss the reasoning behind this and present a rationale for excision margins.
Managing Water in a Changing World
Claudio Cassardo,J. Anthony A. Jones
Water , 2011, DOI: 10.3390/w3020618
Abstract: Water, being a primary element in the diet and a necessary resource for the agriculture, can be considered a basic need for humans. In addition, also industrial practices need a growing amount of water. Since human population is continuously growing at a rate that, in the last two centuries, approximates well the exponential, water demand is increasing. However, the water resources on the Earth are finite. For this reason, even disregarding the potential threats due to the climate change, this situation appears as one of the biggest challenges of the current era. Actually, several small-scale regions already face water sustainability problems, and the scarcity of water resources is expected to spread to wider areas in the near future, if the actual trends of development and population growth do not change. The situation is exacerbated as the climate is already changing, due to the anthropogenic emissions of greenhouse gases in the atmosphere, and its rate is expected to increase by the end of this century. The effects of these changes will increase the natural variability of the climate, exacerbating the extreme climatic phenomena (drought and flood events) and increasing the difficulty of managing water resources, especially in the most vulnerable regions.
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