A5034642373- Microwave Engineering and Waveguides
- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Advanced Antenna and Metasurface Technologies
- Millimeter-Wave Propagation and Modeling
- Antenna Design and Analysis
- Plasma Applications and Diagnostics
- Microwave Imaging and Scattering Analysis
- Advancements in Semiconductor Devices and Circuit Design
- Plasma Diagnostics and Applications
- 3D IC and TSV technologies
- Advanced MEMS and NEMS Technologies
- Advanced Data Compression Techniques
- Metamaterials and Metasurfaces Applications
- Radar Systems and Signal Processing
- Plasmonic and Surface Plasmon Research
- Advancements in Photolithography Techniques
- Soil Moisture and Remote Sensing
- Analytical chemistry methods development
- Electromagnetic Compatibility and Noise Suppression
- Dust and Plasma Wave Phenomena
- Algorithms and Data Compression
- Neural Networks and Applications
Rigetti Computing (United States)
2018-2020
Agilent Technologies (United States)
2014
Agilent Technologies (Germany)
2014
University of Michigan
2007-2012
Michigan United
2011-2012
University of Tehran
2005
Harnessing techniques from analog signal processing, we establish a new path for large-scale quantum computation.
A central challenge in building a scalable quantum computer with superconducting qubits is the execution of high-fidelity two-qubit gates presence many resonant elements. As more elements are added to architecture, and as multiplicity their couplings grows, design's frequency space becomes crowded, performance suffers. The authors present way address this difficulty: selective activation interactions between transmon fixed those tunable frequency. This depends on both amplitude modulation,...
This paper describes design and development of a novel frequency beam-scanning array antenna operating at Y-band (220-325 GHz). The proposed is traveling-wave antenna, with meandered rectangular waveguide structure as the propagating medium. generates very narrow beamwidth about 2.5° ±25° beam steering capability sweeps from 230 to 245 GHz. in elevation 10°, which generated slot-coupled cavity-backed patch along direction. provides an overall gain over 29 dBi exhibits radiation efficiency...
Superconducting quantum computers require microwave control lines running from room temperature to the mixing chamber of a dilution refrigerator. Adding more without preliminary thermal modeling make predictions risks overwhelming cooling power at each stage. In this paper, we investigate load SC-086/50-SCN-CN semi-rigid coaxial cable, which is commonly used for and readout superconducting computer, as increase number processor. We makeup cables, verify materials dimensions, experimentally...
We describe a microfabrication process for superconducting through-silicon vias appropriate use in qubit quantum processors. With sloped-wall via geometry, we can non-conformal metal deposition methods such as electron-beam evaporation and sputtering, which reliably deposit high quality films. Via superconductivity is validated by demonstrating zero via-to-via resistance below the critical temperature of aluminum.
In this paper, the Doppler spectra of radar backscatter response human body and a quadruped are presented at W-band frequencies. This study is motivated by desire to utilize millimeter-wave radars detect pedestrians against other targets in scene. The approach based on dissecting isolate returns from different parts. forward model an iterative physical optics approach. complex motion parts walking bodies their amplitude range directly reflected cross section (RCS) spectrum bandwidth. It...
A novel cavity-backed coplanar waveguide (CBCPW) to rectangular transition having a 2.5D geometry compatible with micromachining fabrication technique is presented. This makes use of short-circuited pin (as opposed suspended probe) in conjunction resonant sections CPW line over the broad wall reduced height segment facilitate impedance matching. Although bandwidth this smaller than standard probe transitions, its at submillimeter-wave and terahertz bands rather straightforward does not...
Autonomous small robotic platforms require a suite of sensor to navigate and function in complex environment. Due limited space, onboard power, processing capability these sensors must be low mass, compact size, run with minimal resources. We are the process developing low-power imaging mm-wave radar system for autonomous operating at Y-band allow navigation obstacle detection conditions that make use passive optical difficult or impossible. The is being fabricated assembled using silicon...
Fully micromachined waveguide filters are realized based on metal E-plane rods. The rods make a series of shunt inductors separated by the length waveguide. Two- and three-pole filter designs for 230~245 GHz bands constructed in WR-3 introduced. microfabricated etching waveguides one silicon wafer which later is bonded with another metal-coated wafer. devices measured using J-band S-parameter test measurement results good agreement simulation results.
We report on the fabrication and metrology of superconducting caps for qubit circuits. As part a 3D quantum integrated circuit architecture, cap chip forms upper half an enclosure that provides isolation, increases vacuum participation ratio, improves performance individual resonant elements. Here, we demonstrate such can be reliably fabricated, placed chip, form connections to circuit.
A transition from cavity-backed coplanar waveguide (CBCPW) to rectangular using a short-circuited pin in conjunction with resonant sections of (CPW) and reduced height segments is presented. The proposed designed prismatic features order ease the fabrication process. An equivalent circuit model developed facilitate design procedure full-wave analysis used optimise design. As an example operating at Ka-band shown have insertion loss less than 1 dB reflection below −10 over 9% bandwidth for...
In this article, a novel frequency beam-scanning phased array antenna operating at Y-band is presented. The proposed travelling-wave antenna, with cavity-backed patch arrays as the radiating elements. generates very narrow beam (less than 2.5°) broadside of ±25° steering capability. A prototype fabricated using silicon micromachining high level accuracy and low mass cost. Moreover, waveguide-probe near-field measurement setup introduced utilized to characterize radiation characteristics...
This paper presents the concept, design and fabrication of beam-scanning array antenna operating at Y-band (230-245 GHz) for light-weight collision avoidance applications. The consists over 40 radiating sub-arrays, generating a very narrow beam less than 3° in azimuth about 10° elevation with ±25° steering capability. Slot-coupled cavity-backed patch arrays are used as elements main order to confine plane. Silicon micromaching technology is microfabricate prototype antenna. To characterize...
This paper presents a polarimetric model for backscatter and its Doppler spectrum of walking human dog subject at W-band using GO-PO method. Polarimetric measurements target with without firearm are also presented to demonstrate the increase in level cross-polarized backscatter. Furthermore, we present time-frequency analysis separate response torso.
In this study, we propose a cavity-backed CPW (CBCPW) to rectangular waveguide transition compatible with silicon microfabrication techniques that does not require multiple parts and assemblies. approach, the complexity associated fabrication of suspended probe is eliminated compact wideband achieved using novel two-pole resonant matching network. The composed shorted line over reduced height short-circuited segment followed by an E-plane step discontinuity standard waveguide. Since...
Josephson junction based parametric amplifiers are used to read out the state of superconducting qubits with high fidelity. These themselves circuits operating at temperatures tens millikelvin. A version this type amplifier which has exhibited large bandwidth and saturation power is traveling wave (JTWPA). One particular JTWPA topology consists hundreds thousands junctions in a transmission line configuration along periodic phase matching resonators increase gain. Here, we look using qubit...
This paper describes a novel travelling-wave frequency beam-scanning array antenna operating at Y-band. The proposed is composed of over 40 cavity-backed patch arrays as the radiating elements, with total 588 elements. generates very narrow beam (HPBW less than 2.5°) broadside ±25° steering capability. A prototype fabricated using silicon micromachining high level accuracy and low mass cost. To characterize micromachined antenna, waveguide-probe near-field measurement setup good agreement...
Atmospheric pressure microwave-induced (MIP or MP) torches are frequently used in industrial and environmental sectors for chemical analysis of various samples. In spite their significant use industry, data related to the plasma inside torch is rare. this work, we have analyzed an MP that commercially available. The main objective work was gather information dependence on gas flow conditions. Investigations were also carried out understand analyte-plasma interaction its Experimental results...
A grating composed of successive layers left-handed (LH) and right-handed (RH) materials is investigated. It shown that, in this structure, unlike gratings purely RH materials, there exist pairs complex modes without which a complete modal analysis not possible. Complex propagation constants these are determined by solving an analytical characteristic equation.
Sensors for autonomous small robotic platforms must be low mass, compact size and power due to the limited space. For such applications, as dimensions of structures shrink, standard machining methods are not suitable because fabrication tolerances high cost in assembly. Commonly, show a degree complexity error alignment, air gaps between conductive parts, poor metal contact, inaccuracy patterning non-contact lithography, complex assemblies various number steps needed construction. However,...
In this study, we propose a very simple and easy-to-fabricate transition from low loss ground coplanar waveguide (GCPW) with sidewalls to rectangular waveguide. It consists of two steps transition, one an ordinary CPW GCPW side walls, the other Since design is features are aligned Cartesian coordinates, it highly compatible microfabrication processes can be fabricated using either lithography thick photoresists or multi-step deep reactive ion etching (DRIE) silicon. A back structure by...
One of the challenges for building a quantum computer with superconducting qubits is being able to integrate sufficient density microwave lines in cryogenic environment. Traditionally this has been limited by pitch SMA cables. When trying go beyond approach there are two problems address. The first outfitting dilution refrigerator enough run from room temperature base stage. second package integrated circuit that houses itself. We propose solution both these using RF flexible circuits...
The millimeter-wave (MMW) region of electromagnetic spectrum presents a unique opportunity in detection pedestrians heavy clutter environment and hidden objects carried by individuals. In our previous studies [1], [2], we presented polarimetric radar Doppler signature walking human dog at 95 GHz. We utilized physical optics (PO) method to model the body with equivalent PO surface geometrical (GO) determine shadowed areas for given orientation respect direction incident wave. first order...