103 research outputs found
Interconnect Fabrics for Multi-Core Quantum Processors: A Context Analysis
Quantum computing has revolutionized the field of computer science with its
extraordinary ability to handle classically intractable problems. To realize
its potential, however, quantum computers need to scale to millions of qubits,
a feat that will require addressing fascinating yet extremely challenging
interconnection problems. In this paper, we provide a context analysis of the
nascent quantum computing field from the perspective of communications, with
the aim of encouraging the on-chip networks community to contribute and pave
the way for truly scalable quantum computers in the decades to come.Comment: 6 pages, 4 figures; appearing in Proceedings of the IEEE/ACM NoCArc
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VHF band-pass filter based on a single CMOS-MEMS doubleended tuning fork resonator
AbstractThis paper presents a single Double-Ended Tuning Fork (DETF) MEMS resonator-based band-pass filter fabricated on a commercial standard CMOS technology. The accurate design of this resonator demonstrates the ability to perform filtering without the need of coupling multiple resonators. The main characteristic is to define the out-of-phase mode resonance frequency of the DETF smaller than the in-phase mode frequency. The electrical characterization shows that this stand-alone band-pass filter presents a 44.4MHz central frequency with a 0.6% bandwidth in air
Scale up your In-Memory Accelerator: Leveraging Wireless-on-Chip Communication for AIMC-based CNN Inference
Analog In-Memory Computing (AIMC) is emerging as a disruptive paradigm for heterogeneous computing, potentially delivering orders of magnitude better peak performance and efficiency over traditional digital signal processing architectures on Matrix-Vector multiplication. However, to sustain this throughput in real-world applications, AIMC tiles must be supplied with data at very high bandwidth and low latency; this poses an unprecedented pressure on the on-chip communication infrastructure, which becomes the system's performance and efficiency bottleneck. In this context, the performance and plasticity of emerging on-chip wireless communication paradigms provide the required breakthrough to up-scale on-chip communication in large AIMC devices. This work presents a many-tile AIMC architecture with inter-tile wireless communication that integrates multiple heterogeneous computing clusters, embedding a mix of parallel RISC-V cores and AIMC tiles. We perform an extensive design space exploration of the proposed architecture and discuss the benefits of exploiting emerging on-chip communication technologies such as wireless transceivers in the millimeter-wave and terahertz band
Mapping quantum algorithms to multi-core quantum computing architectures
Current monolithic quantum computer architectures have limited scalability.
One promising approach for scaling them up is to use a modular or multi-core
architecture, in which different quantum processors (cores) are connected via
quantum and classical links. This new architectural design poses new challenges
such as the expensive inter-core communication. To reduce these movements when
executing a quantum algorithm, an efficient mapping technique is required. In
this paper, a detailed critical discussion of the quantum circuit mapping
problem for multi-core quantum computing architectures is provided. In
addition, we further explore the performance of a mapping method, which is
formulated as a partitioning over time graph problem, by performing an
architectural scalability analysis
Vibration energy harvesting via parametrically-induced bistability
The dynamic response to white Gaussian noise of a bistable non-linear vibration energy harvester based on the repulsive electrostatic interaction between a microcantilever and an electrode has been theoretically studied. The cantilever-electrode system can be brought from a linear regime characterized by a quadratic potential, when cantilever is far from the electrode, to a non-linear bistable regime characterized by a quartic potential, when both elements are close enough. This distance parameter, which is commonly used to tune bistability, is unusually used here also to inject the energy to the system in the form of displacement noise. Thus, the widening and shifting to the low-frequency region of the response spectrum as well as the enhancement of the rms out-of-plane vibration of the cantilever are both demonstrated through this parametrically-induced bistability
Nanometer-scale oxidation of Si(100) surfaces by tapping mode atomic force microscopy
The nanometer¿scale oxidation of Si(100) surfaces in air is performed with an atomic force microscope working in tapping mode. Applying a positive voltage to the sample with respect to the tip, two kinds of modifications are induced on the sample: grown silicon oxide mounds less than 5 nm high and mounds higher than 10 nm (which are assumed to be gold depositions). The threshold voltage necessary to produce the modification is studied as a function of the average tip¿to¿sample distance
Modelos de negocio de las editoriales de revistas científicas: implicaciones para el acceso abierto
A set of parameters to analyze business models of scientific publishers, especially those that offer open access to their content for all or some of their journals, is presented and defined. A definition of the term “business model” that exceeds the old conceptual restriction tied to funding sources is given. This more complete view of the business model requires extending the analysis of funding sources to other economic and financial components as well as operational and strategic dimensions of the publisher. This allows a better and more authoritative interpretation and analysis of the various business models of scientific publishers
Monolithic mass sensor fabricated using a conventional technology with attogram resolution in air conditions
Premi a l'excel·lència investigadora. Àmbit de les Ciències Tecnològiques. 2008Monolithic mass sensors for ultrasensitive mass detection in air conditions have been fabricated using a conventional 0.35 μm complementary metal-oxide-semiconductor (CMOS) process. The mass sensors are based on electrostatically excited submicrometer scale cantilevers integrated with CMOS electronics. The devices have been calibrated obtaining an experimental sensitivity of 6×10−11 g/cm2 Hz equivalent to 0.9 ag/Hz for locally deposited mass. Results from time-resolved mass measurements are also presented. An evaluation of the mass resolution have been performed obtaining a value of 2.4×10−17 g in air conditions, resulting in an improvement of these devices from previous works in terms of sensitivity, resolution, and fabrication process complexity
Integrated tunneling sensor for nanoelectromechanical systems
Transducers based on quantum mechanical tunneling provide an extremely sensitive sensor principle, especially for nanoelectromechanical systems. For proper operation a gap between the electrodes of below 1nm is essential, requiring the use of structures with a mobile electrode. At such small distances, attractive van der Waals and capillary forces become sizable, possibly resulting in snap-in of the electrodes. The authors present a comprehensive analysis and evaluation of the interplay between the involved forces and identify requirements for the design of tunnelingsensors. Based on this analysis, a tunnelingsensor is fabricated by Si micromachiningtechnology and its proper operation is demonstrated
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