Thermalizing Material Enclosure for Quantum Computing Qubit Cooling
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Solution Overview
Problem
Current quantum computing devices face limitations in qubit coherence time due to inadequate thermalization, as the top portion of the chip lacks direct link to the cold reservoir, and the bottom portion does not efficiently contact the copper portion of the assembly, restricting the use of full surface area for thermalization.
Innovation Solution
A system and method involving an enclosure with thermalizing material to thermally link a cryogenic device to a quantum computing device, where the enclosure can be sealed to contain a liquid thermalizing material like superfluid helium or a solid material like pressurized helium, enhancing thermalization by increasing the exposed surface area and improving thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If quantum processor chips are packaged in assemblies of copper and PC boards with traditional cooling methods, then external connectivity to room temperature electronics is enabled, but the top portion of the chip containing qubits has no direct link to the cold reservoir and thermalization is insufficient
Solution Approach 1:
The chip is divided into distinct thermal zones: a top portion with qubits that directly contacts the cold reservoir, and a bottom portion with classical electronics. This segmentation allows each region to be optimized for its specific thermal requirements, with the qubit region achieving direct thermalization while the classical region maintains room temperature connectivity.
Solution Approach 2:
The patent implements a nested thermalization structure where the cold reservoir penetrates through the chip assembly, with copper heat sinks and thermalization layers embedded within the chip structure. The qubit region is nested within a cryogenic environment that is itself nested within the broader chip assembly, enabling direct thermal contact while maintaining external connectivity.
2Temperature
If the bottom portion of the chip contacts the copper portion of the assembly, then thermalization can occur, but interface imperfections, epoxy coverage, and material limitations restrict the effectiveness and full surface area utilization
Solution Approach 1:
Different regions of the chip are assigned different thermal properties and contact mechanisms. The qubit region utilizes direct contact with high thermal conductivity materials and optimized interface geometry, while other regions use appropriate thermalization methods suited to their specific requirements. This local optimization ensures each area achieves maximum thermalization effectiveness.
Solution Approach 2:
The patent incorporates preliminary thermalization features in the chip design, such as pre-formed thermal interfaces, embedded heat sinks, and optimized contact surfaces that are prepared during manufacturing. This preliminary action ensures that when the chip is assembled and cooled, the thermalization pathways are already established and optimized, avoiding interface imperfections that would occur with post-assembly thermalization.
3Duration of action of moving object
If traditional cooling methods are used without direct cold reservoir link to qubits, then device assembly is simpler, but coherence time is limited due to inadequate thermalization
Solution Approach 1:
The patent merges the cooling system with the chip assembly itself, where the cold reservoir and thermalization structures are integrated directly into the chip packaging. This merging eliminates the need for separate, complex external cooling systems while achieving superior thermalization of the qubits, thereby extending coherence time without proportionally increasing overall device complexity.
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
This approach increases the coherence time of qubits by maximizing thermalization, allowing for efficient cooling while maintaining external connectivity to room temperature electronics, thereby improving the operational stability of quantum computing devices.
Implementation Method 1
the thermalizing material is adapted to thermally link a cryogenic device to the quantum computing device
Implementation Method 2
the enclosure can be sealed to contain a liquid thermalizing material like superfluid helium
Data Source
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AI summary
Devices, systems, methods, and computer-implemented methods to facilitate employing thermalizing materials in an enclosure for quantum computing devices are provided. According to an embodiment, a system can comprise a quantum computing device and an enclosure having the quantum computing device disposed within the enclosure. The system can further comprise a thermalizing material disposed within the enclosure, with the thermalizing material being adapted to thermally link a cryogenic device to the quantum computing device.