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Heterogeneous integration of spin–photon interfaces with a CMOS platform

Colour centres in diamond have emerged as a leading solid-state platform for advancing quantum technologies, satisfying the DiVincenzo criteria1 and recently achieving quantum advantage in secret key distribution2. Blueprint studies3–5 indicate that general-purpose quantum computing using local quantum communication networks will require millions of physical qubits to encode thousands of logical qubits, presenting an open scalability challenge. Here we introduce a modular quantum system-on-chip (QSoC) architecture that integrates thousands of individually addressable tin-vacancy spin qubits in two-dimensional arrays of quantum microchiplets into an application-specific integrated circuit designed for cryogenic control. We demonstrate crucial fabrication steps and architectural subcomponents, including QSoC transfer by means of a ‘lock-and-release’ method for large-scale heterogeneous integration, high-throughput spin-qubit calibration and spectral tuning, and efficien

United statesBonilla ataidesNano lettA nuclearInternational electron devices meetingOptical society of americaQuantum infSolid state circuitsQuantum communicationElectron devices meetingOptical society

Reproducible graphene synthesis by oxygen-free chemical vapour deposition

Chemical vapour deposition (CVD) synthesis of graphene on copper has been broadly adopted since the first demonstration of this process1. However, widespread use of CVD-grown graphene for basic science and applications has been hindered by challenges with reproducibility2 and quality3. Here we identify trace oxygen as a key factor determining the growth trajectory and quality for graphene grown by low-pressure CVD. Oxygen-free chemical vapour deposition (OF-CVD) synthesis is fast and highly reproducible, with kinetics that can be described by a compact model, whereas adding trace oxygen leads to suppressed nucleation and slower/incomplete growth. Oxygen affects graphene quality as assessed by surface contamination, emergence of the Raman D peak and decrease in electrical conductivity. Epitaxial graphene grown in oxygen-free conditions is contamination-free and shows no detectable D peak. After dry transfer and boron nitride encapsulation, it shows room-temperature electrical-transport

Sri lankaNano lettSw john hartVp researchJohn hart

Suppressed thermal transport in silicon nanoribbons by inhomogeneous strain

Suppressed thermal transport in silicon nanoribbons by inhomogeneous strain
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Nano lettGe energyHeat transferImage processToday physQuantum physics

High-performance fibre battery with polymer gel electrolyte

Replacement of liquid electrolytes with polymer gel electrolytes is recognized as a general and effective way of solving safety problems and achieving high flexibility in wearable batteries1–6. However, the poor interface between polymer gel electrolyte and electrode, caused by insufficient wetting, produces much poorer electrochemical properties, especially during the deformation of the battery7–9. Here we report a strategy for designing channel structures in electrodes to incorporate polymer gel electrolytes and to form intimate and stable interfaces for high-performance wearable batteries. As a demonstration, multiple electrode fibres were rotated together to form aligned channels, while the surface of each electrode fibre was designed with networked channels. The monomer solution was effectively infiltrated first along the aligned channels and then into the networked channels. The monomers were then polymerized to produce a gel electrolyte and form intimate and

Nano lettFibers for advanced electrochemical energy storage devicesNano energyEnergy materEnergy environBased fibersAdvanced electrochemical energy storagePower sources

Meet the quantum plumbers uncovering the mysteries of fluid mechanics at the nanoscale – Physics World

Meet the quantum plumbers uncovering the mysteries of fluid mechanics at the nanoscale – Physics World
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United kingdomNordrhein westfalenCalifornia institute of technologyUnited statesFrance generalComunidad autonoma de catalunaLawrence livermore national laboratoryNikita kavokineMarie laure bocquetAngelos michaelidesSumio iijimaBen corryOlgica bakajinNano lettGiancarlo franzeseSandra troian