A sequence of laser pulses is presented to implement a new kind of CNOT-gate in an linear arrangement of trapped ions. This type of quantum gate enables the designer of quantumalgorithms to "send information int...
A sequence of laser pulses is presented to implement a new kind of CNOT-gate in an linear arrangement of trapped ions. This type of quantum gate enables the designer of quantumalgorithms to "send information into the phonon bus" controlled by the information stored in one of the ions. Some simulation results are given to show the dynamics of the system during the gate implementation. The simulation gives information about the leakage and the gate accuracy.
A sequence of laser pulses is presented to implement a new kind of CNOT-gate in an linear arrangement of trapped ions. This type of quantum gate enables the designer of quantumalgorithms to "send information int...
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A sequence of laser pulses is presented to implement a new kind of CNOT-gate in an linear arrangement of trapped ions. This type of quantum gate enables the designer of quantumalgorithms to "send information into the phonon bus" controlled by the information stored in one of the ions. Some simulation results are given to show the dynamics of the system during the gate implementation. The simulation gives information about the leakage and the gate accuracy.
Current schemes for implementing quantum logic involve controlled coupling between two-level systems, or qubits, which requires a large number of qubits to be entangled coherently for informationprocessing. A multile...
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quantuminformation theory has revolutionised our view on the true nature of information and has led to such intriguing topics as teleportation and quantum computation. The field -- by its very nature strongly interdi...
ISBN:
(数字)9789810248185
ISBN:
(纸本)9789810241179
quantuminformation theory has revolutionised our view on the true nature of information and has led to such intriguing topics as teleportation and quantum computation. The field -- by its very nature strongly interdisciplinary, with deep roots in the foundations both of quantum mechanics and of information theory and computer science -- has become a major subject for scientists working in fields as diverse as quantum optics, superconductivity or information theory, all the way to computer *** aim of this book is to provide guidance and introduce the broad literature in all the various aspects of quantuminformation theory. The topics covered range from the fundamental aspects of the theory, like quantumalgorithms and quantum complexity, to the technological aspects of the design of quantum-information-processing devices. Each section of the book consists of a selection of key papers (with particular attention to their tutorial value), chosen and introduced by leading scientists in the specific area. An entirely new introduction to quantum complexity has been specially written for the book.
Optical correlators using spatial light modulators in the filter plane have been discussed and presented for many years. In most cases, these devices are electrically addressed modulators and the filters are generated...
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ISBN:
(纸本)0819441856
Optical correlators using spatial light modulators in the filter plane have been discussed and presented for many years. In most cases, these devices are electrically addressed modulators and the filters are generated off-line in software. These filters can be tailored to fit the desired application but cannot be adjusted to account for real-time changes in the target appearance. In addition, building filters to account for all of the possible viewing configurations can strain the reference database and the memory storage capability of the system. Recently, a correlator architecture that used an optically addressed, multiple quantum well (MQW) spatial light modulator as the filter plane device was presented. The architecture is a modified Vander Lugt correlator with and additional input modulator. The filter formed by the interference of the reference image beam and the reference beam is recorded on the MQW spatial light modulator. The recorded filter retains the full complex information as high-resolution film did years ago. Additionally, the filter can be updated simply by changing the pattern on the reference input modulator. The second input modulator is used to address this stored filter in - a normal correlator read-out configuration. The correlator has been completed and results will be presented as part of this paper.
Technology and Culture42.1 (2001) 184-185In this volume, Michael Hobart and Zachary Schiffman cast western intellectual history into a sequence of four "information ages." The first of these was a preliterat...
Technology and Culture42.1 (2001) 184-185In this volume, Michael Hobart and Zachary Schiffman cast western intellectual history into a sequence of four "information ages." The first of these was a preliterate era, when people relied on the spoken word to transmit their thoughts and memories. The authors claim that in this time there was no distinct information, as records and human action were inextricably entwined. During the second period, literacy allowed people to create information, separate from narration. Systematic attempts to classify this information created what the authors call an age of wisdom. Toward the end of this period, the advent of the printed book made it possible to transmit accumulated facts and classification schemes far more widely and *** the sixteenth century to the nineteenth, the development of algebraic notation, formal algorithms, and the calculus made it possible to describe much of the world mathematically. Hobart and Schiffman identify this third period, which they call the age of knowledge, with "numeracy" and modernism. Finally, in the twentieth century, the rise of quantum mechanics cast doubt on attempts to fully describe the behavior of individual[End Page 184]particles, while Gödel's incompleteness theorem led to questions about the possibility of developing mathematical systems that could be proven consistent. At the same time, the vast improvement in informationprocessing and communication devices made it possible to transmit large quantities of information. Thus the advent of a new information *** authors are to be commended for their attempt to set the social and technological changes associated with the computer into a larger context, and for their appreciation of the historical importance of literacy, mathematics, and mathematical physics. The range of their story, from ancient Mesopotamia to the twentieth century western world, is remarkable. Regrettably, they have left little room for individual stories
High-throughput, data-directed computational protocols for Structural Genomics (or Proteomics) are required in order to evaluate the protein products of genes for structure and function at rates comparable to current ...
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ISBN:
(纸本)9781581133530
High-throughput, data-directed computational protocols for Structural Genomics (or Proteomics) are required in order to evaluate the protein products of genes for structure and function at rates comparable to current gene-sequencing technology. To develop such methods, new algorithms are required that can quickly extract significantly more structural information from sparse experimental data. This paper presents a new class of signal processingalgorithms for nuclear magnetic resonance (NMR) structural biology, based on time-frequency analysis of chemical shift dynamics. A novel approach to multidimensional NMR analysis is proposed in which the data are interpreted in the time-frequency domain, as opposed to the traditional frequency domain. Time-frequency analysis (TFA) exposes behavior orthogonal to the magnetic coherence transfer pathways, thus affording new avenues of NMR discovery. An implementation yielding new biophysical results is discussed. In particular, we demonstrate the heretofore unknown p resence of through-space inter-atomic distance information within 15N-edited heteronuclear single-quantum coherence (15N HSQC) data. A biophysical model explains these results, and is supported by further experiments on simulated spectra.
Summary form only given. quantuminformationprocessing relies on interference and entanglement. Certain quantumalgorithms have been demonstrated using interference alone. These have been criticized on the grounds th...
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Summary form only given. quantuminformationprocessing relies on interference and entanglement. Certain quantumalgorithms have been demonstrated using interference alone. These have been criticized on the grounds that the number of resources they require does not scale favorably with the size of the database. Nonetheless it has been argued that algorithms implemented entirely using interference may be more efficient than algorithms implemented on classical particle-based machines.
A classical computer does not allow the calculation of a discrete cosine transform on N points in less than linear time. This trivial lower bound is no longer valid for a computer that takes advantage of quantum mecha...
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ISBN:
(纸本)9539676940
A classical computer does not allow the calculation of a discrete cosine transform on N points in less than linear time. This trivial lower bound is no longer valid for a computer that takes advantage of quantum mechanical superposition, entanglement, and interference principles. In fact, we show that it is possible to realize the discrete cosine transforms and the discrete sine transforms of size N/spl times/N and types I, II, III and IV with as little as O(log/sup 2/N) operations on a quantum computer; whereas the known fast algorithms on a classical computer need O(N logN) operations.
The fractional Fourier transform (FRFT) is one-parametric generalization of the classical Fourier transform. FRFT was introduced in the 1980s and found a lot of applications in signal processing. The time and spectral...
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ISBN:
(纸本)9539676940
The fractional Fourier transform (FRFT) is one-parametric generalization of the classical Fourier transform. FRFT was introduced in the 1980s and found a lot of applications in signal processing. The time and spectral domains are both the special cases of the functional Fourier domain. They correspond to the 0th and 1st fractional Fourier domains, respectively. We introduce the classical and quantum fractional Haar-wavelet transforms and develop corresponding fast algorithms.
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