Superconducting Rigid-Flex Circuit for Qubit Thermal Isolation
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Solution Overview
Problem
The challenge of controlling large numbers of qubits in quantum devices is exacerbated by the IO-density bottleneck and heat dissipation from control circuitry, which is difficult to manage in cryogenic environments due to limited cooling power, necessitating a high thermal gradient between the qubit plane and the control system.
Innovation Solution
A superconducting rigid-flex circuit is used to interconnect the qubit and control systems, with independent cooling systems maintaining temperatures below 100 mK and 10 K respectively, while allowing for electrical conductivity and thermal isolation, using a flexible circuit portion to separate the qubits from the control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control circuitry is integrated close to qubits to reduce IO-density bottleneck, then control signal delivery is improved, but heat dissipation increases and exceeds cryogenic cooling capacity
Solution Approach 1:
The system divides the circuit board into distinct rigid and flexible portions, with control circuitry segregated onto the rigid portion and qubits on the flexible portion. This spatial segmentation allows control signals to be delivered efficiently while physically separating heat-generating components from heat-sensitive components, resolving the contradiction between control signal delivery and heat dissipation management.
Solution Approach 2:
The flexible circuit portion acts as an intermediary between the rigid control circuitry and the qubits. It provides electrical connectivity for control signals while its flexible, thin structure minimizes thermal conduction from the control circuitry to the qubits, thus mediating the thermal interaction and allowing control signals to pass without transferring harmful heat.
2Use of energy by stationary object
If control circuitry operates at higher temperature to dissipate heat, then cooling requirements are reduced, but qubit operating temperature cannot be maintained below 100 mK
Solution Approach 1:
The circuit board is segmented into a rigid portion for control circuitry and a flexible portion for qubits, enabling different thermal management strategies for each segment. The rigid portion can operate at higher temperatures with more aggressive cooling, while the flexible portion maintains ultra-low temperatures for qubits, thus resolving the contradiction between cooling power consumption and qubit temperature maintenance.
Solution Approach 2:
Different portions of the system are assigned different thermal properties and operating conditions. The rigid circuit portion is designed for higher temperature operation with corresponding cooling infrastructure, while the flexible circuit portion is optimized for ultra-low temperature operation. This local differentiation allows each region to operate optimally without compromising the other, resolving the thermal management contradiction.
3Stability of the object's composition
If rigid circuit board is used for structural support, then mechanical stability is improved, but thermal isolation between control system and qubits deteriorates
Solution Approach 1:
The circuit board is segmented into rigid and flexible portions, each serving distinct functional roles. The rigid portion provides mechanical stability and structural support for control circuitry, while the flexible portion provides thermal isolation and flexibility for qubit connections. This segmentation allows the system to simultaneously achieve mechanical stability and thermal isolation by assigning these properties to different segments.
Solution Approach 2:
The circuit board employs a composite structure combining rigid and flexible portions with different material properties. The rigid portion uses materials optimized for mechanical strength and stability, while the flexible portion uses materials with low thermal conductivity for thermal isolation. This composite approach allows the single circuit board to provide both mechanical stability and thermal isolation simultaneously.
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 enables high thermal gradient and electrical connectivity without requiring exotic substrates, maintaining qubit performance by minimizing noise and heat interference, and allowing for scalable quantum computing.
Implementation Method 1
a first cooling system operable to maintain an operating temperature for the qubit plane and the first rigid circuit portion of the superconducting rigid-flex circuit at or below 100 milli-kelvin
Implementation Method 2
a second cooling system operable to maintain an operating temperature for the control system and the second rigid circuit portion of the superconducting rigid-flex circuit at or below 10 kelvin
Implementation Method 3
a superconducting rigid-flex circuit for interconnecting the qubit plane with the control system for the qubit plane
Data Source
AI summary
Systems and methods for supporting a high thermal gradient between a qubit plane and a control system for the qubit plane are described. A system includes a qubit plane associated with a first rigid circuit portion of a superconducting rigid-flex circuit and a control system associated with a second rigid circuit portion of the superconducting rigid-flex circuit. The superconducting rigid-flex circuit includes a flexible circuit portion for interconnecting the first rigid circuit portion with the second rigid circuit portion. The system further includes a first cooling system operable to maintain an operating temperature for the qubit plane and the first rigid circuit portion of the superconducting rigid-flex circuit at or below 100 milli-kelvin. The system further includes a second cooling system operable to maintain an operating temperature for the control system and the second rigid circuit portion of the superconducting rigid-flex circuit at or below 10 kelvin.