On the $mathrmIn_xGa_1-xAs$ channel noise in InP HEMTs from 4 K to 300 K

Posted by klaurent Caltech

Kavli Affiliate: Austin Minnich | Summary:The InP high-electron-mobility transistor (HEMT) is indispensable for low-noise amplifiers (LNAs) in radio astronomy and quantum computing. The composition of the $mathrmIn_xGa_1-xAs$ channel in InP HEMT is known to influence the LNA noise performance. However, the various physical mechanisms responsible for noise generation are not fully characterized and understood. Here, […]


Continue.. On the $mathrmIn_xGa_1-xAs$ channel noise in InP HEMTs from 4 K to 300 K

Pseudo-superconducting-diode effect in ferroelectric Josephson junctions

Posted by klaurent Delft

Kavli Affiliate: Mazhar Ali | Summary: The superconducting diode effect (SDE), characterized by unequal critical supercurrents in opposite current directions, enables supercurrent rectification. We propose a magnetic-field-free pseudo-superconducting-diode effect in ferroelectric Josephson junctions with broken inversion symmetry. Using a coupled dynamical model that combines a polarization-dependent RCSJ description with Landau-Khalatnikov-Tani ferroelectric dynamics, we show that […]


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High-Performance Real-Time Implicit Strand-Based Hair Rendering via Software Rasterization

Posted by klaurent Delft

Kavli Affiliate: Michael Wimmer | Summary:In this work we propose an efficient deferred software rasterization pipeline for real-time rendering of strand-based hair using hair meshes. Hair plays a crucial role in creating expressive 3D characters, yet strand-based approaches are often restricted to high-end hardware and typically applied to only a small number of hero characters. […]


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Atmospheric characterization of six ultra-hot Jupiters from $K$-band high-resolution spectroscopy

Posted by klaurent Caltech

Kavli Affiliate: Dimitri Mawet| Summary:We present new Keck/KPIC high-resolution spectroscopic detections of three ultra-hot Jupiters (UHJs) in the $K$ band: WASP-189b ($rm SNR = 7.2$), MASCARA-1b ($rm SNR = 8.6$), and TOI-1518b ($rm SNR = 7.1$), as well as a tentative detection of KELT-9b ($rm SNR = 5.0$). We perform a uniform set of atmospheric […]


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Metallic Ultrasound Waveguides as a Distributed Tactile Sensing Platform for Contact Localization, Force Estimation, and Material Class Discrimination

Posted by klaurent Caltech

Kavli Affiliate: Morteza Gharib| Summary:Tactile sensing is central to how robotic systems interact with the real world, yet current solutions face a tradeoff between sensing area and system complexity. This work investigates metallic ultrasound waveguides as distributed tactile sensors fully interrogated from a single proximal transducer. Using cylindrical indenters, we characterized the acoustic response to […]


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Tracing the Boundary of the South Atlantic Anomaly Region with SPHEREx Transient Flagging Rates

Posted by klaurent Caltech

Kavli Affiliate: James Bock | Summary:The NASA SPHEREx satellite was launched in 03/2025 to survey the full sky between 0.75 – 5.0 um. The image processing of SPHEREx H2RG detectors includes real-time flagging of transient events during integration. SPHEREx follows a polar orbit passing over the South Atlantic Anomaly (SAA) zone multiple times daily, where […]


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Coupling loss and transmission in a multimode fiber-fed Virtually Imaged Phased Array (VIPA)

Posted by klaurent Harvard

Kavli Affiliate: David Charbonneau | Summary:The Virtually Imaged Phased Array (VIPA) is a spectral disperser that has seen increasing adoption across various applications, including optical telecommunications, high-resolution spectroscopy, and LiDAR. Although VIPAs are typically fed by single-mode optical fiber in these applications, there is growing interest in using a multimode optical fiber feed to enable […]


Continue.. Coupling loss and transmission in a multimode fiber-fed Virtually Imaged Phased Array (VIPA)

One More Time: Revisiting Neural Quantum States from a Reinforcement Learning Perspective

Posted by klaurent Delft

Kavli Affiliate: Eliska Greplova | Summary:Neural quantum states (NQS) provide a flexible and scalable framework for approximating quantum many-body wavefunctions. Among NQS parameterizations, autoregressive models are especially attractive because they enable exact, independent sampling from the Born distribution, avoiding the autocorrelation and mixing issues of Markov chain methods. Yet their optimization remains comparatively underexplored: Adam […]


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TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline

Posted by klaurent Caltech

Kavli Affiliate: James Bock | Summary:The Tomographic Ionized-carbon Mapping Experiment (TIME) is a line intensity mapping (LIM) instrument that is designed to observe the power spectrum of the [CII] $158$~$μ$m emission line during the Epoch of Reionization. TIME completed a commissioning run in 2022 at the Arizona Radio Observatory onboard the 12-M Radio Telescope at […]


Continue.. TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline

TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline

Posted by klaurent Caltech

Kavli Affiliate: James Bock | Summary:The Tomographic Ionized-carbon Mapping Experiment (TIME) is a line intensity mapping (LIM) instrument that is designed to observe the power spectrum of the [CII] $158$~$μ$m emission line during the Epoch of Reionization. TIME completed a commissioning run in 2022 at the Arizona Radio Observatory onboard the 12-M Radio Telescope at […]


Continue.. TIME Commissioning Observations: II. On-sky Characterization and the 2D Map Data Processing Pipeline