Friday, Apr. 15, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Dr. Hiroshi Fuketa
Cryogenic CMOS Circuits for Quantum Computers
Superconducting and semiconductor quantum computers are currently attracting much interest. In conventional quantum computers, controlling and readout of the state of qubits at cryogenic temperature are conducted by instruments at room temperature. In this architecture, however, it is difficult to achieve large-scale quantum computers. Thus, many researchers pay attention to CMOS integrated circuits operating at cryogenic temperature that implement the functions of the qubit control instruments at room temperature. In this lecture, I introduce the latest research on cryogenic CMOS circuits for quantum computers.
Friday, 5. 13, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Dr. Rudy Raymond
Recent Techniques in Variational Quantum Algorithms: Decision Diagrams for Quantum Measurements and Quantum Relaxations for Combinatorial Optimization
Variational quantum algorithms (VQAs) offer opportunities to utilize near-term quantum devices, despite their limited connectivity and circuit depths, to achieve promising quantum advantages. There are several crucial tasks to fully leverage VQAs, such as, how to measure quantum states to obtain precise estimates corresponding to the target problems. The first part of the talk will introduce an efficient method based on decision diagrams to perform quantum measurements with shallow circuits. The second part of the talk will present our new technique, in addition to that in the first part, to encode binary optimization problems with the so-called Quantum Random Access Codes (QRACs) to solve the largest instances of MaxCut problems ever performed via VQAs on gate-based quantum computers. This talk is based on https://arxiv.org/abs/2105.06932 and https://arxiv.org/abs/2111.03167
Friday, Jun 17, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Dr. Dr. Koji Nii
SRAM design challenges on advanced technology nodes
Although the technology scaling of the logic CMOS process tends to slow down, it is still in progress even now in the single-digit node era. It has been realized that the performance-power-area (PPA) is continuously migrated by Design Technology Co-Optimization (DTCO). In particular, embedded SRAMs are extremely important IPs that occupy most of the area of the SoC in advanced logic processes. SRAM also plays an important role in process development, performance characteristics, monitoring of yield and reliability. In this talk, SRAM design challenges in advanced nodes and examples of countermeasures by DTCO will be introduced.
Friday, July 22nd, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Dr. Ruiting Ouyang
WRAN: A Wide-Area Wireless Communication System with Dynamic Spectrum Sharing Technology
The rapid growth of data traffic in wireless communication results in the growing demand for radio spectrum. The scarcity of radio spectrum motivates the development of spectrum sharing technology that enables spectrum utilization in an efficient and intelligent manner. The spectrum sharing technology allows the coexistence between different wireless communication systems by secondarily using the spectrum allocated to primary systems with conditions. IEEE 802.22 is one of the wireless communication systems that supports wide-area communication with spectrum sharing. This talk addresses the overview of IEEE 802.22-based communication system, relevant research issues, challenges and ongoing research topics.
Friday, Oct. 21st, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Prof. Ryota Yasudo
Classical Advantage Over Quantum Annealing: Case Studies of FPGA, ASIC, and GPU
Quantum annealing, a class of quantum computation, is an approximate method for solving combinatorial optimization problems formulated with Ising model or quadratic unconstrained binary optimization (QUBO). This method has already been commercialized and actual devices can be used, but the upper limit on the number of variables is small and thus not scalable. On the other hand, the advent of quantum annealing has triggered research and development of QUBO solvers on classical computers. This talk begins with introduction to research on QUBO solvers using FPGAs, ASICs, and GPUs, respectively. If there is quantum supremacy or quantum advantage, annealing by classical computation is considered to be inferior to quantum annealing, but at least in terms of scalability, classical computation is superior to quantum annealing. In this talk, I will go further and introduce the study that suggests the advantage of classical computation in terms of computation speed and solution accuracy over quantum annealing. Note that the topic of this talk is focused on quantum annealing and does not mention the quantum circuit model of computation.
Friday, Nov. 18th, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Hiroatsu Sato
Earth Observation using Synthetic Apertura Radar and its Application for Space Weather Research
Synthetic Aperture Radar (SAR) is a microwave imaging system that provides information about the Earth’s surface during day and night. SAR satellites have become one of the most important remote sensing tools in Earth observation and are used in both scientific research and industry. In this talk, the fundamentals of SAR imaging will be explained with some examples from Earth observation and the latest developments in the application of L-band SAR system for space weather research will be introduced.
Friday, Dec. 16th, 2022 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Masahiro FUJII
The reality of “5G”. How vertualization will change that.
At first, the followings will be explained from the perspective of one engineer of one telecommunications company, (1) The technical realty of “5G” (2) The status of virtualization technology in the wireless communication field Then, I will analyze how telecommunications engineers are starting to think about business.
Friday, Dec. 20th, 2023 at 16:45-18:15
The URL of Zoom will be announced via faculty’s mailing list 3 days before the colloquium.
The lecture material will be available in PandA at 16:15 on the day of the colloquium.
The lecture will be recorded, and video and audio will be available on PandA.
Dr. Eiichi Yoshikawa
Weather Radar, Signal Processing, and Their Applications to Aircraft Operation
Weather radars and signal processing, which have become intimately related by recent rapid progresses of digital technologies, are described. Principles of weather radar stem from electromagnetism and atmospheric sciences. On the other hand, signal processing is based on mathematics. By explaining these fields comprehensively, this class would motivate not only each research field but also multi-disciplinary innovations. In addition, applications of weather information to aircraft operation are introduced, by which audiences will see how novel technologies of these fields are utilized in civil lives and feel closer to researches.