Cryogenic Qubit Control Electronics With 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 and high-power DACs for generating qubit control signals, which adversely affect error rates and scalability.
Innovation Solution
The implementation of qubit control electronics in an integrated circuit (IC) that operates at cryogenic temperatures, utilizing programmable current sources and mixer circuits to generate qubit control signals, reducing the need for room-temperature interconnects and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If room-temperature interconnects and high-power DACs are used to generate qubit control signals, then signal generation capability is sufficient, but power consumption is high and cabling requirements are extensive
Solution Approach 1:
The patent moves the control signal generation from room temperature to cryogenic temperature domain, placing the DAC and control electronics in a different thermal dimension. This allows the use of superconducting interconnects at cryogenic temperatures, eliminating the need for extensive room-temperature cabling while reducing power consumption through cryogenic operation of the DAC
Solution Approach 2:
The patent introduces a cryogenic intermediate stage as a mediator between room temperature and superconducting qubit temperatures. This intermediate cryogenic stage hosts the control electronics and serves as a transition zone, allowing signals to be generated at low temperatures and transmitted via superconducting interconnects without requiring extensive room-temperature cabling
2Reliability
If room-temperature interconnects are used to transfer data, then data transfer is reliable, but power consumption increases and error rates are adversely affected
Solution Approach 1:
The patent changes the temperature parameter of the control electronics and interconnects from room temperature to cryogenic temperatures. This parameter change enables superconducting operation with zero resistance, eliminating power loss in interconnects while maintaining reliable data transfer. The cryogenic operation also reduces thermal noise, improving signal fidelity and reducing error rates
Solution Approach 2:
The patent employs a composite system combining cryogenic CMOS or bipolar control electronics with superconducting interconnects. This composite architecture allows the control logic to operate at cryogenic temperatures while utilizing the zero-resistance property of superconducting materials for data transfer, achieving both low power consumption and high reliability
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.