Diamondoid Dielectric Films for Low-Loss Quantum Qubit Interconnects
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Solution Overview
Problem
Current dielectric materials in quantum computing devices have high loss tangents, leading to chip heating, pulse distortion, and decoherence of quantum states, and existing low-loss materials require high temperatures and pressures that can degrade qubit devices.
Innovation Solution
The use of diamondoid dielectric materials (DDMs) with a high proportion of sp3 carbon bonds, manufactured as thin films with low bond polarities, to serve as low-loss dielectric materials in quantum computing devices, enabling strong spatial localization and control of quantum dots and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional dielectric materials are used in quantum computing devices, then device fabrication can proceed with standard materials, but high loss tangents cause chip heating, pulse distortion, and decoherence of quantum states
Solution Approach 1:
The patent changes the fundamental chemical composition parameters of the dielectric material by using diamondoid materials with predominantly sp3 hybridized carbon atoms. This structural parameter change results in low bond polarities and consequently low dielectric loss tangents (less than 0.001), directly reducing energy loss and the associated harmful effects of chip heating and quantum state decoherence
Solution Approach 2:
The patent employs composite dielectric structures incorporating diamondoid materials combined with other low-loss materials such as silicon oxide, silicon nitride, or diamond. This composite approach allows optimization of both dielectric performance (low loss tangent) and compatibility with quantum device fabrication processes, achieving reduced energy loss without sacrificing manufacturability
2Loss of energy
If existing low-loss dielectric materials are used, then dielectric loss is reduced, but high temperatures and pressures required for fabrication degrade qubit devices
Solution Approach 1:
The patent changes the material composition to diamondoid materials that can be deposited as thin films at low temperatures and pressures using techniques such as chemical vapor deposition (CVD) or atomic layer deposition (ALD). This parameter change in fabrication conditions allows achieving low dielectric loss without exposing sensitive qubit devices to high temperatures that would cause degradation
Solution Approach 2:
The patent uses diamondoid materials as an intermediary dielectric layer that can be deposited under gentle conditions compatible with quantum device fabrication. These materials serve as a mediator between the requirement for low dielectric loss and the sensitivity of qubit devices to high-temperature processing, enabling low-loss performance without thermal degradation
3Loss of energy
If diamondoid dielectric materials are used, then low-loss properties and low-temperature fabrication are achieved, but new material deposition processes are required
Solution Approach 1:
The patent leverages the universality of existing thin-film deposition techniques such as CVD and ALD, which are already widely used in semiconductor manufacturing. By adapting these established processes to deposit diamondoid materials, the patent achieves low-loss dielectric performance without requiring entirely new fabrication equipment or methodologies, thus maintaining ease of manufacture while improving dielectric performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
DDMs provide low-loss dielectric properties compatible with quantum device fabrication at low temperatures and pressures, reducing chip heating and decoherence, and enabling the integration of large numbers of qubits with effective signal control.
Implementation Method 1
diamondoid dielectric materials (DDMs) with a high proportion of sp3 carbon bonds, manufactured as thin films with low bond polarities, to serve as low-loss dielectric materials
Data Source
AI summary
Disclosed herein are diamondoid materials in quantum computing devices, as well as related methods, devices, and materials. For example, in some embodiments, a quantum computing device may include: qubit circuitry, an interconnect in conductive contact with the qubit circuitry, and a dielectric material proximate to the interconnect, wherein the dielectric material includes a diamondoid film.