Researchers Assess Two-Dimensional Materials for Scalable Quantum Hardware

The ability to fabricate reproducible solid-state quantum processors is now closer thanks to an evaluation of whether manufacturing processes developed for conventional computer chips can also be used with two-dimensional materials. This assessment details both the opportunities and limitations presented by atomically thin crystals, as their unique interfaces may help overcome challenges like maintaining qubit coherence which can be compromised by imperfections introduced during fabrication. Reproducible manufacturing alongside reliable qubit operation are requirements for developing solid-state quantum processors, because imperfections introduced during fabrication can reduce how long qubits maintain information. Two-dimensional materials, crystals one or a few atoms thick, offer potential solutions due to their unique atomic structure and interfaces that may mitigate these issues. These materials are being developed for conventional computer chips, meaning existing chip production techniques could be adapted for building quantum devices. Maintaining qubit coherence is vital as any disturbance leads to information loss; it’s akin to keeping a spinning top balanced. Two-dimensional materials offer potential solutions because their unique atomic structure may overcome fabrication imperfections that shorten how long qubits retain data. These crystals also utilise van der Waals interfaces, gentle connections between layers similar to magnets weakly adhering to a refrigerator door, allowing for novel device designs. Researchers at Eindhoven University of Technology assess the opportunities and limitations of using 2D materials in compatible quantum hardware, but further investigation is needed to determine whether current manufacturing processes can truly deliver scalable and reliable quantum processors.

Extended Transmon Coherence via Low-Loss Hexagonal Boron Nitride Capacitors fabricated with Established Processes Transmon coherence reaching twenty-five microseconds has been reported by scientists; this represents a strong improvement over previous systems limited to individual devices or small sets. This level surpasses typical performance benchmarks established by conventional solid-state qubit technologies because achieving such extended coherence times in scalable platforms proved elusive due to fabrication imperfections impacting quantum information retention. The assessment explores whether existing CMOS manufacturing processes can be adapted for creating robust two-dimensional material based quantum hardware without requiring entirely new infrastructure. A loss tangent, measuring energy dissipation, was bounded to mid-10−6 range within hexagonal boron nitride capacitors demonstrated by researchers; the result directly contributed to observed twenty-five microsecond transmon coherence times. Assessments on bilayer graphene revealed a spin orbit gap around sixty μeV alongside an upper bound of just twenty μeV for intervalley mixing, confirming distinguishable intended quantum states. Detailed spectroscopic analysis also examined charge noise and traps in both host materials and gate dielectrics, important factors influencing qubit stability and fidelity across multiple devices. Despite this strong progress, consistent device behaviour across large-scale production runs remains elusive, as do solutions related to long-term material degradation under cryogenic operation. Van der Waals integration mirroring CMOS fabrication for scalable quantum circuits The team employed advanced materials growth techniques to fabricate atomically thin layers of two-dimensional (2D) materials, crystals only one or a few atoms thick, then integrated these into device structures using van der Waals interfaces; gentle connections between material layers resemble magnets weakly adhering to a refrigerator door. Adapting existing fabrication methods designed for conventional computer chips allowed scientists to assess whether they could be directly applied when building quantum devices without requiring entirely new manufacturing infrastructure. Reported results include hBN capacitor transmons demonstrating coherence up to twenty-five microseconds, graphene vdW gatemon qubits exhibiting coherent control and single hole devices achieving spin valley relaxation times of thirty-eight seconds at thirty millikelvins. Scientists are fabricating atomically thin 2D materials as potential building blocks for future quantum computers, utilising established CMOS technology to evaluate compatibility with quantum device creation rather than focusing on fully functional prototypes. Integrating quantum devices with conventional silicon manufacturing presents both opportunities and obstacles Eindhoven University of Technology researchers propose a compelling combination between established CMOS manufacturing and emerging solid-state qubits; leveraging existing infrastructure promises to accelerate progress beyond purely academic demonstrations. However, this vision hinges on successfully navigating significant fabrication challenges, specifically minimising chemical residues and structural disorder within these atomically thin materials. While adapting current processes appears feasible, competing approaches focus on entirely novel quantum device architectures which bypass the need for compatibility altogether, potentially offering greater performance gains if substantial investment in new tooling proves worthwhile. Acknowledging that entirely new fabrication methods may ultimately prove superior does not diminish the immediate value of this evaluation.

The team’s assessment establishes a potential pathway towards scalable solid-state qubits by evaluating two-dimensional materials within current complementary metal oxide semiconductor manufacturing processes; it uses existing infrastructure designed for silicon spin qubits already produced on three hundred millimetre wafers. By highlighting critical barriers related to maintaining qubit coherence despite imperfections introduced during manufacture, specifically chemical residues and structural disorder impacting performance, their work shifts focus from material properties alone toward manufacturability as an equally important consideration when realising practical quantum computation. The research demonstrated that two-dimensional materials can be fabricated using established CMOS technology currently employed in conventional silicon chip production. This matters because utilising existing manufacturing infrastructure offers a potential route towards scaling up the creation of solid-state qubits beyond small laboratory demonstrations. Researchers evaluated these atomically thin materials at thirty millikelvins, identifying key challenges relating to minimising fabrication defects which impact qubit coherence. The study emphasises that successful large-scale quantum computing requires attention not only to material quality but also to reliable and repeatable manufacture on three hundred millimetre wafers. 👉 More information🗞 Two-Dimensional Materials toward CMOS-Compatible Scalable Quantum Hardware✍️ Mara Lieberegts and Ye Wang🧠 ArXiv: https://arxiv.org/abs/2609.16172 More like thisQuantum Computing Business NewsIQM reports three continents buy quantum computers—and the software to use themQuantum Research NewsLeverhulme backs superfluid helium qubit design with £1.3M UKRI fellowshipQuantum HardwareNullspace software uses quantum standing waves to cool trapped ionsQuantum HardwareDiraq and Dell link quantum chip to HPC for faster workflowsStay currentSee today’s quantum computing news on Quantum Zeitgeist for the latest breakthroughs in qubits, hardware, algorithms, and industry deals. Tags: