Control-Noise Trade-offs in Industrially Integrated $^28mathrmSi/mathrmSiGe$ Spin-1/2 Qubits

Posted by klaurent Delft

Kavli Affiliate: Giordano Scappucci | Summary:Scaling silicon spin qubits to fault-tolerant processors requires semiconductor foundry integration, yet it remains unclear how industrial fabrication and dense device integration affect qubit control and noise. Here we study $^28mathrmSi/mathrmSiGe$ electron spin-1/2 qubits fabricated using Intel’s industry-compatible 300 mm process and incorporating micromagnets for electrically driven spin resonance, using […]


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Observation-Specific Uncertainty Modeling for Latent-Variable Regression in High-Dimensional Analytical Data

Posted by klaurent Oxford

Kavli Affiliate: Molly Stevens | Summary:Across many fields, including medical diagnostics, process monitoring, and quality control, decisions often rely on point predictions for single samples. Observation-specific uncertainty is needed to assess the risk of decision error when predictions are compared with thresholds. Latent-variable regression is widely used for such predictions, but observation-specific uncertainty remains difficult […]


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Cavity-engineered ferroelectricity in SrTiO$_3$

Posted by klaurent Cornell

Kavli Affiliate: Darrell Schlom | Summary:Interfacing quantum materials with photonic cavity architectures is at the vanguard of materials engineering. The structured electromagnetic fluctuations of a dark cavity environment can renormalize fundamental thermodynamical material properties and energy scales, holding promise to create a rich ecosystem of cavity-induced ground states and functionalities absent in the bare material. […]


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Thermal laser evaporation of superconducting Nb films

Posted by klaurent Caltech

Kavli Affiliate: Austin Minnich | Summary:Thermal laser evaporation (TLE) is an emerging physical vapor deposition (PVD) technique that uses continuous-wave lasers to evaporate even the most refractory elements. The deposition and characterization of superconducting refractory elements are of interest to assess the quality of films deposited by TLE. Here, we report the deposition of niobium […]


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Complex Langevin kernels for real-time SU(N) lattice gauge theory in 3+1 dimensions

Posted by klaurent Cornell

Kavli Affiliate: David Muller | Summary:We investigate complex Langevin (CL) dynamics for real-time SU($N$) gauge theories in 3+1 dimensions and introduce new kernel modifications tailored for lattice gauge theory (LGT). Using the anisotropic kernel as a baseline, we demonstrate that on a rectangular regularized Schwinger-Keldysh time contour, stable simulations are possible for pure SU(2) gauge […]


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Antenna-coupled microstrip summing network for wave-like dark matter searches

Posted by klaurent Stanford

Kavli Affiliate: Chao-Lin Kuo | Summary:A commonly used technology for axion and other wave-like dark matter searches is a microwave resonator. In such experiments, the detected signal strength depends on the coupling between the resonator and the microwave transmission line that delivers power to the amplifier. In Axion Dark Matter eXperiment (ADMX) and other cavity […]


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The Cosmic Ultraviolet Baryon Survey X: Density and Pressure Profiles of Clumpy Circumgalactic Gas at $z=0.4-0.7$

Posted by klaurent Chicago

Kavli Affiliate: Hsiaowen Chen |Summary:The thermodynamic state and turbulent properties of the cool circumgalactic medium (CGM) are investigated for 23 galaxies and galaxy groups at intermediate redshift ($z=0.4$–0.7) in the Cosmic Ultraviolet Baryon Survey (CUBS) midz sample using background QSOs within the virial radius. Kinematically resolved absorption-line measurements from Hubble Space Telescope/COS and STIS spectra, […]


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Spontaneous magnetic diode effect in Co$_1/3$TaS$_2$

Posted by klaurent Caltech

Kavli Affiliate: Linda Ye| Summary:When electrons move through non-trivial spin textures in magnetic metals, conduction electrons couple to magnetic order through both their charge and their spin, acquiring non-trivial equations of motion and a dynamic spin polarization providing the foundation of spintronics. These mechanisms are, however, almost invariably reciprocal and the resistance a current encounters […]


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Local Analogs of Little Red Dots: Clues to the X-ray Weakness

Posted by klaurent Peking, This Week: Astrophysics

Kavli Affiliate: Luis Ho | Summary:A major question about JWST’s little red dots (LRDs) at $zsim4-8$ is the origin of their apparent X-ray weakness. Even deep Chandra stacks yield only tentative detections or broad-band limits and cannot distinguish among super-Eddington accretion, intrinsic X-ray weakness, and Compton-thick (CT) obscuration. Local analogs offer a powerful complementary route. […]


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FRB 20210601A: Extreme Temporal Clustering in a Repeating Fast Radio Burst Source as Evidence for a Hidden Class of Episodic Repeaters

Posted by klaurent MIT, This Week: Astrophysics

Kavli Affiliate: Kiyoshi Masui | Summary:Population studies of fast radio burst (FRB) repetition typically model sources using a single distribution of steady, time-averaged burst rates, yet individual sources show significant departures from this assumption. Here we present FRB 20210601A, a source discovered by the Canadian Hydrogen Intensity Mapping Experiment FRB project (CHIME/FRB) that represents the […]


Continue.. FRB 20210601A: Extreme Temporal Clustering in a Repeating Fast Radio Burst Source as Evidence for a Hidden Class of Episodic Repeaters