This Week: Nanoscience – Kavli Institute Pre-Print Publications

Simulation Study of Reconstruction of Cosmic Ray Extensive Air Shower with Thermal Neutron Detected by ENDA

Posted by klaurent October 9, 2026October 12, 2026Caltech, This Week: Nanoscience

Kavli Affiliate: Wei Gao| Summary:In the investigation of the "knee" region within the cosmic ray energy spectrum, extensive air shower (EAS) reconstruction by using different EAS secondary particles are of paramount importance for energy determination and composition separation and finally measurement of energy spectrum of different cosmic ray composition. The Electron-Neutron Detector Array (ENDA) is […]

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Local polarization control of optical tweezer arrays

Posted by klaurent October 8, 2026October 12, 2026Caltech, This Week: Nanoscience

Kavli Affiliate: Nelson Darkwah Oppong| Summary:Optical tweezer arrays trapping ultracold atoms and molecules are a versatile quantum science platform with broad impact in quantum simulation, quantum computation, and quantum metrology. The polarization dependence of anisotropic vector and tensor light shifts offers a degree of freedom for precise quantum state engineering of trapped particles. Similarly, state-selective […]

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TestPrism: Rethinking Test Evaluation Beyond a Single Reference

Posted by klaurent October 8, 2026October 12, 2026Caltech, This Week: Nanoscience

Kavli Affiliate: Wei Gao| Summary:Large language model (LLM) coding agents have advanced test generation across diverse programming tasks. However, the common practice of evaluating tests against a single reference solution overlooks alternative valid implementations and can overstate test quality. We introduce TestPrism, comprising 300 test tasks from 17 sources and 3000 candidate implementations, evenly split […]

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Dynamical many-body control of high harmonic generation in a Mott insulator

Posted by klaurent October 8, 2026October 12, 2026Caltech, This Week: Nanoscience

Kavli Affiliate: David Hsieh| Summary:High harmonic generation (HHG) has emerged as a powerful probe of ultrafast electron dynamics in solids. However, in strongly correlated materials, where electronic excitations arise from many-body interactions rather than single-particle band dispersion, the field remains in its infancy. Here, we report HHG up to the 23$^rd$ order in the prototypical […]

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Sub-MHz SWAP spectroscopy of two-level systems in superconducting qubits

Posted by klaurent October 8, 2026October 12, 2026Caltech, This Week: Nanoscience

Kavli Affiliate: Oskar Painter | Summary:An outstanding challenge in superconducting quantum circuits is mitigating loss from two-level system (TLS) defects. SWAP spectroscopy with flux-tunable qubits can detect individual TLSs, but the Rabi chevrons that signal coherent exchange have been observed only for the most strongly coupled defects. Here, we introduce a sequence with fast flux […]

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Dynamically protected erasure qubit via low-frequency charge driving

Posted by klaurent October 7, 2026October 12, 2026Berkeley, This Week: Nanoscience

Kavli Affiliate: Irfan Siddiqi | Summary:Dynamical protection via strong driving can enable resilient quantum processing on imperfect physical hardware. However, the practical utility of such schemes is frequently limited by parasitic processes such as drive-induced dephasing and leakage. Here, we demonstrate that sub-GHz charge driving of superconducting Kerr oscillators (KOs) in the transmon regime circumvents […]

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Ambipolar metal-insulator transition in bilayer MoSe2

Posted by klaurent October 6, 2026October 12, 2026Berkeley, This Week: Nanoscience

Kavli Affiliate: Archana Raja| Summary:When Coulomb interactions dominate kinetic energy, dilute two-dimensional carriers form a Wigner solid. Both its melting and disorder-driven localization can drive density-tuned metal-insulator transitions, but their relative roles and interplay have been debated for decades. Atomically thin semiconductors offer a new test because transport and scanning tunneling microscopy can probe the […]

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Superconducting edge contact to a buried Ge quantum well

Posted by klaurent October 6, 2026October 12, 2026Delft, This Week: Nanoscience

Kavli Affiliate: Giordano Scappucci | Summary:Semiconductor-superconductor hybrid systems form the basis for a broad range of quantum phenomena, such as Andreev bound states, topological superconductivity, and hybrid quantum Hall states. The performance of these hybrid systems can strongly benefit from the exceptional electronic properties of heterostructures with deeply buried quantum wells. However, establishing high-quality superconducting […]

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Sparse qubit operation in a 6$times$6 quantum dot array

Posted by klaurent October 6, 2026October 12, 2026Delft, This Week: Nanoscience

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 […]

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EigenDEXplore: Structured Exploration for Dexterous Manipulation with Human Priors

Posted by klaurent October 6, 2026October 12, 2026Caltech, This Week: Nanoscience

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 […]

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