Cryogenic CMOS Qubit Control Circuits for Low-Power Signal Generation
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Solution Overview
Problem
Current quantum computing systems face challenges with high power consumption and extensive cabling requirements due to the use of room-temperature interconnects for qubit control signals, which can lead to increased decoherence and gate errors, necessitating significant redundancy and resource-intensive error correction.
Innovation Solution
The development of qubit control electronics integrated into a CMOS integrated circuit that operates at cryogenic temperatures, utilizing a signal envelope generator circuit and mixer circuits to generate qubit control signals, reducing the need for room-temperature interconnects and minimizing power consumption while maintaining low error rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If room-temperature interconnects are used for qubit control signals, then signal transmission is achieved, but power consumption increases and decoherence errors increase
Solution Approach 1:
The patent moves the control electronics from room temperature to cryogenic temperature dimension, placing them at or near the qubit operating temperature (4K or lower). This dimensional shift in temperature space eliminates the need for warm interconnects, reducing power consumption and decoherence errors by eliminating thermal radiation and resistive losses in interconnect cables.
Solution Approach 2:
The patent introduces cryogenic CMOS control electronics as an intermediary stage between room temperature and superconducting qubit temperatures. This intermediate control layer at 4K temperature acts as a mediator that generates control signals locally, eliminating direct room-temperature-to-qubit interconnects and their associated power losses and decoherence.
2Device complexity
If room-temperature interconnects are used for qubit control, then control signals can be transmitted, but extensive cabling requirements arise
Solution Approach 1:
The patent extracts the control signal generation function from room temperature and relocates it to the cryogenic environment. By taking out the ADCs, signal generators, and control logic from the warm environment and placing them at 4K, the system eliminates extensive cabling requirements and reduces gate error rates from interconnect losses.
Solution Approach 2:
The patent merges the control electronics with the qubit environment by co-locating CMOS control circuits at cryogenic temperatures near the superconducting qubits. This merging eliminates separate interconnect pathways, reducing cabling complexity and improving reliability by removing interconnect-induced errors.
3Use of energy by stationary object
If cryogenic cooling is implemented for control electronics, then power consumption is reduced, but cooling infrastructure complexity increases
Solution Approach 1:
The patent makes the cryogenic cooling infrastructure serve multiple functions: it cools both the qubits and the control electronics simultaneously. This multi-functionality justifies the cooling infrastructure complexity by having it perform dual duty, reducing overall power consumption from both the qubit system and control system.
Solution Approach 2:
The control electronics consume power locally at cryogenic temperatures, serving their own cooling needs by being part of the cooled environment. This self-service approach reduces the power that would otherwise need to be transmitted through warm-cold interconnects, making the cooling infrastructure more efficient.
Data Source
AI summary
A device for generating a qubit control signal includes: a first signal envelope generator circuit including a first multiple of signal sources, in which an output of each signal source of the first multiple of signal sources is combined to provide a first cumulative output; and a first mixer circuit coupled to the first signal envelope generator circuit, in which the first cumulative output is coupled to a first input of the first mixer circuit, and an output of the first mixer circuit includes a first qubit control signal.