Scalable Thermalization of Wiring and Attenuation of Signals for Quantum Devices within Quantum Computing Systems
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Solution Overview
Problem
Conventional quantum computing systems face challenges in scaling the number of quantum devices due to heat load and decoherence issues caused by signal absorption in cryogenic systems, leading to loss of coherence as the number of quantum devices increases.
Innovation Solution
Implementing partial reflective elements in the intermediate stage of the cryogenic system to split control signals, where a significant portion is reflected to a heat-sink outside the cryogenic system, while the un-reflected portion is transmitted to the quantum devices, thereby reducing heat radiation and maintaining coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If signal absorption is used to attenuate control signals in the intermediate stage, then signal attenuation is achieved, but heat load and decoherence increase
Solution Approach 1:
The patent replaces the conventional absorptive attenuation mechanism (resistive elements that convert signal energy to heat) with a reflective attenuation mechanism (superconducting resonators that reflect signal energy back). This substitution eliminates the conversion of signal energy into thermal energy, thereby achieving signal attenuation without generating heat load in the intermediate stage
Solution Approach 2:
The patent utilizes the phase transition property of superconducting materials, which transition from normal resistive state to superconducting state below a critical temperature. In the superconducting state, the resonators exhibit zero electrical resistance and can reflect microwave signals without energy dissipation, enabling lossless signal attenuation through reflection rather than absorption
2Productivity
If the number of quantum devices is increased, then computational power is improved, but heat radiation and decoherence worsen
Solution Approach 1:
The patent extracts the harmful heat-generating absorption process from the intermediate stage by removing conventional resistive attenuators and replacing them with superconducting reflective elements. This extraction eliminates the source of heat radiation that would otherwise increase with more quantum devices, allowing scaling while maintaining coherence
Solution Approach 2:
The patent converts the previously harmful reflected signal (which was considered waste energy) into a beneficial component by directing it through a heat sink to the cold stage. The reflected signal now serves to cool the intermediate stage components while the attenuated transmitted signal reaches the quantum devices, transforming a potential problem into a cooling mechanism
3Ease of operation
If conventional absorptive attenuation is used, then signal control is achieved, but scalability to millions of quantum devices is limited
Solution Approach 1:
The patent introduces superconducting resonators as intermediary elements between the signal source and quantum devices. These resonators act as mediators that provide signal attenuation through reflection while introducing minimal heat load. The intermediaries enable scalable architecture by maintaining signal integrity and thermal management across large numbers of quantum devices
Solution Approach 2:
The patent changes the fundamental parameter of signal attenuation from absorptive (resistive) to reflective (superconducting). This parameter change transforms the attenuation mechanism from one that generates heat to one that preserves thermal energy, enabling the system to scale to millions of quantum devices without overwhelming the cryogenic cooling capacity
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 allows for the scaling of quantum devices to millions without significant heat radiation to the ultra-cold stage, maintaining coherence and enabling scalable quantum computation and information processing.
Implementation Method 1
The signal reflector element is configured to split an input signal into a first signal component and a second signal component via a partial reflection of the input signal. The partial reflection of the input signal causes the first signal component of the input signal to be reflected by the signal reflector element and the second signal component of the input signal to be transmitted by the signal reflector element.
Data Source
AI summary
The disclosure is directed to a quantum processor system. The system includes a first cryogenic chamber, a signal reflector element positioned within the first chamber, a second cryogenic chamber, and a quantum device positioned in the second chamber. The signal reflector element is configured to split an input signal into a first signal component and a second signal component. The system further includes a first signal line and a second signal line. The first signal line is configured to provide the input signal from an external environment to the signal reflector element and to provide the reflected first signal component from the signal reflector element to the external environment. The second signal line is configured to provide the transmitted second signal component from the signal reflector element to the quantum device. The signal reflector element electrically couples the first signal line to the second signal line.