Kavli Affiliate: Menno Veldhorst | Summary:Fault-tolerant quantum computation requires increasing the qubit count while maintaining high performance and connectivity. Semiconductor qubits have demonstrated high-fidelity operation, but growing the system size at sufficient connectivity remains challenging, such that scaling mainly occurred in one spatial direction to preserve access for control lines in the other. Here, we […]
Kavli Affiliate: Wei Gao| Summary:Dexterous manipulation poses a challenging high-dimensional optimization problem, as useful behaviors require coordinated motion across many hand joints. In reinforcement learning (RL) and sampling-based trajectory optimization, exploration commonly relies on independent robot joint perturbations, making coordinated behaviors difficult to discover. Prior work reduces this search space for grasp learning using low-dimensional […]
Kavli Affiliate: Kiyoshi Masui | Summary:Magnetar sources are the leading theory for Fast Radio Burst (FRB) progenitors. If magnetars are indeed the dominant sources, we may thus expect any metallicity preference for magnetar formation to be reflected in the FRB site in host galaxies. Here, we leverage Integral Field Unit (IFU) spectroscopy to spatially resolve […]
Kavli Affiliate: David Kleinfeld | Authors: Jia-Jin Liu, Hidenobu Mizuno, Emmanuel Than-Trong, Philipp Machler, Hideaki Kubotera, Tony Barbay, Ching-Yao Wang, Qin-Ling To, Yuki Kamijo, Taki Nishimura, Marc Boisvert, Marie-Eve Paquet, Mikhail Drobizhev, Stephanie J Cragg, Jun Nagai, David Kleinfeld, Serge Charpak and Yusuke NASU | Summary: Extracellular L-lactate reports cellular metabolism, but resolving its dynamics […]
Kavli Affiliate: Martin Haehnelt | Summary:We investigate the hierarchical assembly of black holes (BHs) in the early Universe using the next-generation SEEDZ cosmological zoom-in simulations. Our suite follows two independent regions (textscRarepeak and textscNormal1) evolved with three BH feedback prescriptions: no feedback (NoFB), weak feedback (WeakFB), and standard thermal isotropic feedback (FidBH). Focusing on BH […]
Kavli Affiliate: Deepto Chakrabarty | Summary:Measuring rapid astrophysical phenomena requires many short exposures, which suffer from repeated read noise. A variety of recent technologies are achieving sub-electron read noise, which enable rapid time-domain studies of faint sources. These data can be analyzed with traditional methods, but the ability to resolve individual electrons enables a new […]
Kavli Affiliate: Hsiaowen Chen |Summary:Molecular hydrogen (H$_2$) is the key ingredient for star formation in galaxies. However, how H$_2$ is distributed in and around galaxies is an open question in astronomy. We report the detection of H$_2$ (covering excitation levels $J = 0$ to 3) in a unique environment at a distance of 139 kpc […]
Kavli Affiliate: Lijing Shao | Summary:Fast-spinning, nonaxisymmetrically deformed neutron stars (NSs) are promising targets for continuous gravitational-wave (CGW) searches with current and next-generation ground-based detectors. Ultraluminous X-ray pulsars (ULXPs), characterized by super-Eddington accretion and strong magnetic fields, provide extreme environments in which substantial nonaxisymmetric deformations may develop. In this Letter, we investigate thermo-elastic mountains generated […]
Kavli Affiliate: Renxin Xu | Summary:Thermal X-ray pulse-profile modeling depends on the angular and spectral properties of neutron star atmosphere emission. We construct a compact empirical approximation to the specific intensity using eight coefficients for the angular dependence and five for a normalized spectral kernel. The angular prescription is motivated by the formal solution of […]
Kavli Affiliate: Giordano Scappucci | Summary:Solid-phase reactions offer a route to integrate superconductors into Ge/SiGe heterostructures, but forming high-quality superconducting layers near the buried Ge quantum well remains challenging. We investigate reactions of V, Ta, and Nb with elemental Ge and with the Si$_0.2$Ge$_0.8$ barrier of Ge/SiGe heterostructures at processing temperatures of 365-390 $^circ$C. Cross-sectional […]