Thermally Isolating Cable Assembly for Cryogenic Signal Paths
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Solution Overview
Problem
Existing cable assemblies used in superconducting circuits fail to adequately isolate electrical signals from thermal energy, leading to interference and errors in quantum processors operating in cryogenic environments.
Innovation Solution
A thermally isolating shielded cable assembly is fabricated using a composite of two cables with different materials, where a first cable has solderable wires and a second cable has inner superconducting wires exposed through etching, creating a thermal break to reduce thermal energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous cable assembly is used to transmit signals in superconducting circuits, then electrical signal transmission is maintained, but thermal energy is conducted from room temperature to the cryogenic environment causing interference and errors
Solution Approach 1:
The cable assembly is divided into multiple segments with different material properties. The first portion uses solderable wires for electrical connection, while the second portion uses superconducting wires for thermal isolation. This segmentation allows the cable to simultaneously provide electrical continuity and thermal blocking, resolving the contradiction between signal transmission and thermal isolation.
Solution Approach 2:
Different portions of the cable assembly are assigned different material qualities based on their functional requirements. The first portion (solderable wires) is optimized for electrical connection and mechanical strength, while the second portion (superconducting wires) is optimized for thermal isolation at cryogenic temperatures. This local differentiation allows each segment to perform its specific function optimally.
2Object-affected harmful factors
If superconducting wires are used to provide thermal isolation, then thermal energy transmission is reduced, but the wires must be etched to expose the superconducting material which increases manufacturing complexity
Solution Approach 1:
The superconducting wires are pre-coated with a solderable material layer before assembly. This preliminary coating allows the wires to be easily handled, connected, and assembled using standard soldering techniques. The etching step is then performed selectively to expose only the necessary portions of the superconducting material, minimizing manufacturing complexity while achieving the thermal isolation function.
Solution Approach 2:
A solderable material coating is introduced as an intermediary layer between the superconducting wire core and the external environment. This intermediary layer facilitates easy handling and connection during manufacturing, while the underlying superconducting material provides the thermal isolation function. The coating acts as a protective and functional interface that simplifies the overall manufacturing process.
3Object-affected harmful factors
If a composite cable structure with etched portions is used, then thermal break is achieved, but the cable assembly complexity increases
Solution Approach 1:
The cable assembly merges multiple functions into a single integrated structure. The superconducting wires with selective etching simultaneously provide electrical signal transmission, thermal isolation, and mechanical continuity. By combining these functions into one component rather than using separate elements, the overall system complexity is reduced while achieving the desired thermal break.
Solution Approach 2:
The cable assembly uses composite material construction, combining superconducting materials with solderable coating materials in a single wire structure. This composite approach allows the cable to exhibit multiple properties (electrical conductivity, thermal isolation, mechanical strength) within a unified structure, avoiding the need for separate components and reducing assembly 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
The solution provides a continuous electrical path while interrupting thermal energy transfer, enhancing signal quality and reducing errors in superconducting circuits by leveraging superconducting materials in cryogenic environments.
Implementation Method 1
the inner material is a material that is superconducting at and below a critical temperature
Implementation Method 2
a portion of the second shielding cable of each shielded signal cable assembly is etched to remove the second solderable material and to expose the inner material
Implementation Method 3
leveraging superconducting materials in cryogenic environments
Data Source
AI summary
Cable assemblies and, systems using the assemblies can include thermal breaks between assembly sections, and methods for fabricating the assemblies can include creating thermal breaks. A cable assembly includes a first shielding cable having a first solderable material interleaved with a section of a second shielding cable having an exterior material that is a second solderable material and an inner material that is superconductive at and below a critical temperature. The cable assembly may be fabricated during the assembly of an apparatus, and, following assembly of the apparatus, a segment of the second shielding cable is etched to expose a portion of the inner material. Following fabrication of the cable assemblies, the apparatus may be installed in a cryogenic environment in which the exposed portion of superconductive inner material thermally isolates the cabling assembly proximate to a superconducting circuit from the remaining cabling assembly.