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wanghd_8111

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专业: 凝聚态物性 II ：电子结构

[交流] 中国科技大学研制成功世界上第一台量子计算机

November 2007, to be published in Physical Review Letters
　　Demonstration of a compiled version of Shor's quantum factoring
algorithm using photonic qubits
　　Chao-Yang Lu, Daniel E. Browne, Tao Yang, and Jian-Wei Pan
　　
　　We report an experimental demonstration of a complied version of Shor's
algorithm using four photonic qubits. We choose the simplest instance of
this algorithm, that is, factorization of $N=15$ in the case that the period
$r=2$ and exploit a simplified linear optical network to coherently
implement the quantum circuits of the modular exponential execution and semi
-classical quantum Fourier transformation. During this computation, genuine
multiparticle entanglement is observed which well supports its quantum
nature. This experiment represents an essential step toward full realization
of Shor's algorithm and scalable linear optics quantum computation.
　　
　　2007 The American Physical Society.
　　
　　中国科技大学的这篇prl 似乎很有分量。两个月前，这篇论文还仅仅是预印本的时
候，《新科学家》(new scientist)就报道了
　　
　　http://technology.newscientist.com/article/mg19526216.700
　　
　　Quantum threat to our secret data
　　
　　* 13 September 2007
　　* Saswato Das
　　* Magazine issue 2621
　　
　　IT MIGHT seem like an esoteric achievement of interest to only a handful
of computer scientists, but the advent of quantum computers that can run a
routine called Shor's algorithm could have profound consequences. It means
the most dangerous threat posed by quantum computing - the ability to break
the codes that protect our banking, business and e-commerce data - is now a
step nearer reality.
　　
　　Adding to the worry is the fact that this feat has been performed by not
one but two research groups, independently of each other. One team is led
by Andrew White at the University of Queensland in Brisbane, Australia, and
the other by Chao-Yang Lu (USTC的，第一作者；潘建伟是通信作者) of the
University of Science and Technology of China, in Hefei. Both groups have
built rudimentary laser-based quantum
　　computers that can implement Shor's algorithm - a mathematical routine
capable of defeating today's most common encryption ...
　　
　　
　　潘建伟的论文被PRL接收后，还没有正式发表，德国的《创新报导》又发表了评论：
　　
　　http://www.innovations-report.de ... /bericht-99247.html
　　
　　A quantum computer breakthrough and dark matter stars
　　(30.11.2007)
　　Highlights in this issue: A quantum computer breakthrough and dark
matter stars.
　　
　　Anzeige
　　Quantum Computer Breakthrough
　　
　　Chao-Yang Lu, Daniel E. Browne, Tao Yang, and Jian-Wei Pan
　　Physical Review Letters (forthcoming) &
　　
　　B. P. Lanyon, T. J. Weinhold, N. K. Langford, M. Barbieri, D. F. V.
James , A. Gilchrist, and A. G. White
　　Physical Review Letters (forthcoming)
　　
　　Two research groups have independently managed to experimentally solve a
mathematical problem with light-based quantum computers. The simultaneous
achievements appear to be the first experimental demonstrations of true (
though rudimentary) quantum mechanical computations. Both groups manipulated
quantum mechanically entangled photons to calculate the prime factors of
the number 15.
　　
　　Although the physicists could have gotten the answer to the problem much
more easily by querying an average elementary school child, the method both
groups used involved a quantum mechanical approach commonly known as Shor's
algorithm. Previous theoretical work has shown that the algorithm could
potentially crack cryptographic codes that are practically unbreakable with
non-quantum mechanical (classical) computers.
　　
　　While there's no great need to factor numbers as small as 15, the
research demonstrates that quantum computation is feasible with existing
technology and could in principle be scaled up to tackle problems that would
take longer than the age of the universe to solve with any classical
computer, but would require only minutes on a quantum computer.
　　
　　In addition to factoring large numbers and solving other challenging
mathematical problems, quantum computers based on the work of these two
groups could help model quantum mechanical problems in physics and chemistry
(sehttp://xxx.lanl.gov/ftp/arxiv/papers/0710/0710.0278.pdf for an example of a q
uantum simulator experiment by C.-Y. Lu et al.), and lead to ultra high speed se
arching algorithms.
　　
　　Chao-Yang Lu (USTC的，第一作者；潘建伟是通信作者)and his group are
currently expanding on their work by trying to manipulate larger numbers of
quantum bits. In the long run, they plan to add quantum memory to their
quantum computers, which could further increase the number of photons they
can control. In addition, because the loss of photons is a huge problem for
light-based quantum computation, they are working on some basic quantum
codes that can protect the quantum information from photon loss error. These
sorts of issues are crucial in the effort to scale up photonic quantum
computation. - JR
　　澳大利亚的一个小组和USTC同时实现了这一伟大的突破。
　　
　　重要的句子：
　　Both groups have built rudimentary laser-based quantum
　　computers that can implement Shor's algorithm - a mathematical routine
capable of defeating today's most common encryption .

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