Time-Multiplexed Bias Voltage Generator for Scalable Spin Qubit Biasing
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Solution Overview
Problem
Existing bias voltage generators struggle to provide stable, low-noise, and power-efficient DC bias voltages to a large number of spin qubits in cryogenic applications, especially as the number of qubits scales up.
Innovation Solution
A bias voltage generator that utilizes a voltage ramp generator coupled with sample-and-hold circuits and a controller to provide a series of different DC bias voltages to multiple terminals, minimizing power dissipation and form factor while ensuring high accuracy and low noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional bias voltage generators are used to provide DC bias voltages to multiple spin qubits, then the number of supported qubits is limited, but the power dissipation and device complexity increase significantly when scaling up
Solution Approach 1:
Multiple independent DC bias voltage generators are merged into a single time-multiplexed generator that sequentially serves multiple qubit electrodes. The controller coordinates sample-and-hold circuits to capture and retain bias voltages for different electrodes at different times, eliminating the need for multiple simultaneous voltage generation circuits and reducing overall power consumption.
Solution Approach 2:
The bias voltage generator operates periodically by sequentially switching between different electrodes to provide bias voltages. The controller enables time-multiplexed operation where each electrode receives its bias voltage during specific time intervals, allowing a single generator to serve multiple electrodes without requiring continuous operation of multiple generators simultaneously.
2Reliability
If multiple independent bias voltage generators are used for each electrode, then each electrode receives stable bias voltage, but the device complexity and power dissipation increase
Solution Approach 1:
Multiple independent DC bias voltage generators are merged into a single time-multiplexed generator that sequentially serves multiple qubit electrodes. The controller coordinates sample-and-hold circuits to capture and retain bias voltages for different electrodes at different times, eliminating the need for multiple simultaneous voltage generation circuits and reducing overall power consumption.
Solution Approach 2:
Sample-and-hold circuits act as intermediary elements between the single time-multiplexed voltage generator and multiple electrodes. These circuits capture the bias voltage during the sampling phase and hold it during the hold phase, ensuring stable voltage delivery to each electrode without requiring dedicated continuous voltage generators for each electrode.
3Use of energy by stationary object
If a single bias voltage generator is shared among multiple electrodes, then power dissipation is reduced, but voltage stability and noise performance deteriorate
Solution Approach 1:
The bias voltage generator operates periodically by sequentially switching between different electrodes to provide bias voltages. The controller enables time-multiplexed operation where each electrode receives its bias voltage during specific time intervals, allowing a single generator to serve multiple electrodes without requiring continuous operation of multiple generators simultaneously.
Solution Approach 2:
Sample-and-hold circuits act as intermediary elements between the single time-multiplexed voltage generator and multiple electrodes. These circuits capture the bias voltage during the sampling phase and hold it during the hold phase, ensuring stable voltage delivery to each electrode without requiring dedicated continuous voltage generators for each electrode.
4Adaptability or versatility
If more bias voltage channels are added to support more qubits, then the system scalability improves, but the form factor and power consumption increase
Solution Approach 1:
Multiple independent DC bias voltage generators are merged into a single time-multiplexed generator that sequentially serves multiple qubit electrodes. The controller coordinates sample-and-hold circuits to capture and retain bias voltages for different electrodes at different times, eliminating the need for multiple simultaneous voltage generation circuits and reducing overall power consumption.
Solution Approach 2:
The single bias voltage generator is designed to perform multiple functions by sequentially serving different electrodes through time-multiplexed operation. The controller and sample-and-hold circuits enable this universal generator to adapt to different electrode requirements, providing scalable support for varying numbers of qubits without proportionally increasing the physical footprint.
Data Source
AI summary
The invention provides a bias voltage generator device comprising a voltage ramp generator for generating a voltage ramp and coupled to a series of terminals for providing a set bias voltage to each terminal, wherein each terminal is coupled to the voltage ramp generator via a sample-and-hold circuit (S&H) for holding a sampled voltage, and a controller adapted to switch each sample-and-hold circuit at a set time to the voltage ramp generator to set the sampled voltage as the set bias voltage, with the voltage ramp generator adapted to provide the voltage ramp to span a required set bias voltage range.