Ion Trap DAC Clock Gating for Low-Noise Qubit Control
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Solution Overview
Problem
Noise within ion trap systems in quantum computers, particularly in the range of 100 kHz-1 MHz, reduces the fidelity of qubits, limiting the system's effectiveness.
Innovation Solution
Implementing a multiplexer to control clock signals to DACs, allowing transmission only when necessary, grouping electrodes and DACs, and using glitch-free multiplexers to minimize noise, especially during gate operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signals are continuously transmitted to all DACs, then timing control of electrodes is ensured, but noise in the system increases
Solution Approach 1:
The patent extracts and removes unnecessary clock signal transmissions to DACs that do not require updates. The multiplexer selectively blocks clock signals to specific DAC groups based on whether their corresponding electrodes need updating, thereby eliminating unnecessary noise sources while maintaining timing control where required.
Solution Approach 2:
The system implements periodic updates only to DAC groups that require them, rather than continuous updates to all DACs. The clock signal is transmitted periodically to active DAC groups based on whether electrode potential changes are needed, reducing overall noise while maintaining necessary timing control.
2Reliability
If clock signals are transmitted to all DACs at all times, then timing synchronization is maintained, but system noise increases
Solution Approach 1:
The patent segments the DACs into multiple groups, with each group controlled by a separate multiplexer. This allows independent control of clock signal transmission to different DAC groups, enabling timing synchronization only where necessary while reducing noise in areas where updates are not required.
Solution Approach 2:
The system implements periodic updates only to DAC groups that require them, rather than continuous updates to all DACs. The clock signal is transmitted periodically to active DAC groups based on whether electrode potential changes are needed, reducing overall noise while maintaining timing control where required.
3Manufacturing precision
If all DACs are updated continuously, then electrode control accuracy is maintained, but noise affecting qubit fidelity increases
Solution Approach 1:
The patent extracts and removes unnecessary clock signal transmissions to DACs that do not require updates. The multiplexer selectively blocks clock signals to specific DAC groups based on whether their corresponding electrodes need updating, thereby eliminating unnecessary noise sources while maintaining timing control where required.
Solution Approach 2:
The system implements periodic updates only to DAC groups that require them, rather than continuous updates to all DACs. The clock signal is transmitted periodically to active DAC groups based on whether electrode potential changes are needed, reducing overall noise while maintaining necessary timing control.
Data Source
AI summary
According to the invention there is provided an ion trap comprising a plurality of electrodes forming an ion trap, a plurality of DACs, each DAC being configured to control an electrode, a clock signal generator, configured to transmit a clock signal to each electrode, a multiplexer configured to stop or transmit the clock signal from the clock signal generator to one or more of the DACs and a clock signal controller configured to control, by the multiplexer, the clock signal to DACs.