Being atomically thin and amenable to external controls, two-dimensional (2D) materials offer a new paradigm for the realization of patterned qubit fabrication and operation at room temperature for quantum information sciences applications. Here we show that the antisite defect in 2D transition metal dichalcogenides (TMDs) can provide a controllable solid-state spin qubit system. Using high-throughput atomistic simulations, we identify several neutral antisite defects in TMDs that lie deep in the bulk band gap and host a paramagnetic triplet ground state. Our in-depth analysis reveals the presence of optical transitions and triplet-singlet intersystem crossing processes for fingerprinting these defect qubits. As an illustrative example, we discuss the initialization and readout principles of an antisite qubit in WS2, which is expected to be stable against interlayer interactions in a multilayer structure for qubit isolation and protection in future qubit-based devices. Our study opens a new pathway for creating scalable, room-temperature spin qubits in 2D TMDs.

Copper has attracted immense interest in advanced electronics attributed to its abundance and high electrical and thermal characteristics. However, the ease of oxidation when subjected to heat and humidity drastically limits its material reliability under extreme environments. Here, we utilize copper nanoplates as a building block to achieve a thermally stable (upwards of 1300 °C), antioxidation, and anticorrosion-printed conductor, with the capability of additively manufacturing on Corning flexible Alumina Ribbon Ceramic. We elucidate the printed copper nanoplates with a low sheet resistance of 4 mΩ/sq/mil by means of a surfacecoordinated formate that inculcates high oxidation and corrosion resistance on a molecular level. In addition, an in situ copper− graphene conversion leads to a hybridized conductor displaying stability at elevated temperatures up to 1300 °C with high ampacity. Further mechanistic studies reveal high-temperature stability from in situ graphene conversion for copper and graphene interfaces, and preferential stacking of copper nanoplates, distinctly suited for emerging high-temperature flexible electronics.

Being the "mother distributions" of all types of two-parton correlation functions, generalized transverse momentum dependent parton distributions (GTMDs) have attracted a lot of attention over the last years. We argue that exclusive double production of pseudoscalar quarkonia (ηc or η b ) in nucleon-nucleon collisions gives access to GTMDs of gluons.

Quantum technologies are poised to move the foundational principles of quantum physics to the forefront of applications. This roadmap identifies some of the key challenges and provides insights on materials innovations underlying a range of exciting quantum technology frontiers. Over the past decades, hardware platforms enabling different quantum technologies have reached varying levels of maturity. This has allowed for first proof-of-principle demonstrations of quantum supremacy, for example quantum computers surpassing their classical counterparts, quantum communication with reliable security guaranteed by laws of quantum mechanics, and quantum sensors uniting the advantages of high sensitivity, high spatial resolution, and small footprints. In all cases, however, advancing these technologies to the next level of applications in relevant environments requires further development and innovations in the underlying materials. From a wealth of hardware platforms, we select representative and promising material systems in currently investigated quantum technologies. These include both the inherent quantum bit systems as well as materials playing supportive or enabling roles, and cover trapped ions, neutral atom arrays, rare earth ion systems, donors in silicon, color centers and defects in wide-band gap materials, two-dimensional materials and superconducting materials for single-photon detectors. Advancing these materials frontiers will require innovations from a diverse community of scientific expertise, and hence this roadmap will be of interest to a broad spectrum of disciplines.

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