Resistive Flex Microwave Attenuator for Low-Photon Qubit Control
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Solution Overview
Problem
Existing attenuators for quantum computational hardware systems introduce spurious signals and thermal photons due to heating, which can cause decoherence in quantum operations, especially when operating at cryogenic temperatures.
Innovation Solution
A resistive flex microwave attenuator with planar transmission lines, featuring a signal line and ground planes made from resistive materials, designed for distributed heat dissipation and spectral filtering, minimizing thermal emission by optimizing the volume and material properties to maintain low photon emission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional attenuators are used to provide signal attenuation, then the desired attenuation is achieved, but thermal photons and spurious signals are introduced causing decoherence
Solution Approach 1:
The patent changes the physical parameters of the attenuator by operating it at cryogenic temperatures (below 4 Kelvin) and using superconducting materials, which fundamentally alters the thermal emission characteristics and reduces thermal photon generation while maintaining attenuation functionality
Solution Approach 2:
The patent employs composite material structures combining superconducting materials with resistive materials in a planar transmission line configuration, allowing simultaneous achievement of signal attenuation and minimal thermal emission through the complementary properties of the materials
2Loss of energy
If attenuators operate at room temperature, then signal attenuation is provided, but excessive heating occurs generating thermal photons
Solution Approach 1:
The patent fundamentally changes the temperature parameter from room temperature to cryogenic temperatures (below 4 Kelvin), which reduces the thermal energy available for photon generation while maintaining the attenuator's ability to dissipate input power as heat without generating harmful thermal photons
Solution Approach 2:
The patent replaces conventional resistive attenuation mechanisms with a superconducting-based mechanism that utilizes quantum mechanical properties to achieve attenuation with minimal thermal emission, substituting classical thermal management with quantum-limited performance
3Productivity
If high drive powers are used for quantum operations, then gate speeds are improved, but thermal emission increases causing decoherence
Solution Approach 1:
The patent changes the temperature parameter to cryogenic levels, which allows the system to tolerate higher drive powers without proportionally increasing thermal emission, thereby enabling faster gate speeds while maintaining low thermal occupation numbers
Solution Approach 2:
The patent converts the potentially harmful effect of high drive power heating into a benefit by using the cold cryogenic environment to absorb the heat without generating significant thermal photons, thus enabling high-power operation for fast gates while maintaining quantum coherence
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 attenuator achieves a significant reduction in thermal photon output, maintaining a factor of 100 lower thermal occupation number compared to commercial attenuators, ensuring a stable and low-thermal environment for quantum computations even with high drive powers, thus enhancing coherence times and gate speeds.
Implementation Method 1
At least one member selected from the group consisting of a ground plane of the set of ground planes and the signal line is resistive to provide attenuation
Implementation Method 2
The set of planar transmission lines has a geometry configured for dissipation of heat, attributable to energy provided at the input, in a manner distributed along a length of the set of planar transmission lines
Implementation Method 3
a resistive flex microwave attenuator with planar transmission lines, featuring a signal line and ground planes made from resistive materials, designed for distributed heat dissipation and spectral filtering
Data Source
AI summary
A resistive flex microwave attenuator for coupling control signals to a quantum computational hardware system includes a set of planar transmission lines, each such planar transmission line having first and second ends along a longitudinal axis. Each such planar transmission line includes: a set of ground planes disposed in a direction parallel to the longitudinal axis; a dielectric disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a signal line disposed in a direction parallel to the longitudinal axis and in contact with the set of ground planes; a metallic layer disposed around the set of ground planes; an input, coupled to such planar transmission line at the first end, and configured to receive the control signals; and an output, coupled to such planar transmission line at the second end, and configured for coupling to the quantum computational hardware system. At least one member selected from the group consisting of a ground plane of the set of ground planes and the signal line is resistive to provide attenuation. The set of planar transmission lines has a geometry configured for dissipation of heat, attributable to energy provided at the input, in a manner distributed along a length of the set of planar transmission lines. The set of planar transmission lines provide attenuation, without recourse to discrete components, across a desired frequency band. If there are a plurality of planar transmission lines, the set of planar transmission lines is disposed so that their respective ground planes are approximately coincident.