ISSN:0031-9228    

DOI:10.1063/1.2409321

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1496358

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1496359

出版商:AIP    

年代:1902

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.1496360

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Quantum computers have the potential to perform tasks exponentially faster than classical computers. Key to this speedup is the massive parallelism and entanglement arising from the superposition of states in quantum bits, or qubits. But the requisite quantum coherence is very fragile, and can be lost through interactions with the environment or other noise sources (see the article by John Preskill in PHYSICSTODAY, June 1999, page 24).

ISSN:0031-9228    

DOI:10.1063/1.1496362

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

Fermilab has a window of opportunity. Its 2‐trillion‐electron‐volt proton–antiproton Tevatron collider is, at present, the world's highest‐energy particle accelerator—the only one with a shot at finding the elusive Higgs boson or direct indications of supersymmetry. But it will hold on to its monopoly only until the completion of CERN's 14‐TeV Large Hadron Collider, which is better poised to make such findings. The LHC is currently scheduled to turn on in 2007, although it is running into some problems (see PHYSICSTODAY, May 2002, page 30).

ISSN:0031-9228    

DOI:10.1063/1.1496363

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

While the US remains the world's science and technology powerhouse, spending more than $264 billion annually on R&D and financing 44&percent; of all global R&D, the country's leadership position could be threatened by continuing problems in K–12 education, the lack of federal support for basic research, and improved science programs in other nations. That is the bottom‐line conclusion of the National Science Board'sScience and Engineering Indicators 2002report, the latest of the biennial “state of science” studies done for the White House and Congress.

ISSN:0031-9228    

DOI:10.1063/1.1496364

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

If the National Compact Stellarator Experiment planned for the Princeton Plasma Physics Laboratory is successful, stellarators could become prime contenders in the snails' race to achieve fusion energy. The $70 million NCSX is allotted $12 million out of the Bush budget's $257 million for fusion research in fiscal year 2003. Assuming the money comes through, construction would begin in 2004, and the stellarator would be due to come online in 2007.

ISSN:0031-9228    

DOI:10.1063/1.1496365

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

In the months since President Bush released his fiscal year 2003 budget calling for a 5&percent; increase in the National Science Foundation budget while simultaneously proposing a 17&percent; increase for the National Institutes of Health, many budget watchers in both Congress and the scientific community have been grumbling. The call for a “more balanced portfolio” between life sciences and basic research has become almost a mantra on Capitol Hill. NSF Director Rita Colwell has repeatedly found herself facing skeptical congressional questioners who note that, because of program money being transferred to NSF from other agencies, her budget request is closer to 3&percent;, or about the rate of inflation.

ISSN:0031-9228    

DOI:10.1063/1.1496366

出版商:AIP    

年代:1902

数据来源: AIP

摘要:

The Bush administration, on the advice of the fossil fuel industry, surprised the international scientific community by refusing to renominate incumbent Robert Watson to chair the Geneva‐based Intergovernmental Panel on Climate Change (IPCC), effectively killing his chances of retaining his position. Instead, at a 19 April meeting, the US delegate to the IPCC voted for Rajendra Pachauri, an Indian energy economist. Watson, who had chaired the IPCC for five years, lost his position by a vote of 76 to 49.

ISSN:0031-9228    

DOI:10.1063/1.1496367

出版商:AIP    

年代:1902

数据来源: AIP