Cryogenic Charge-Locking Circuits for Scalable Qubit Gate Control
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Solution Overview
Problem
Controlling qubit gates in quantum computing devices at cryogenic temperatures is challenging due to the need for generating a large number of voltage signals while minimizing power dissipation and overcoming cable impedance, which is difficult with conventional room temperature pulse generators.
Innovation Solution
A cryogenic-CMOS control system with integrated charge locking circuits and a control architecture that uses capacitive and direct modes to generate voltage signals, reducing capacitance and power dissipation through tight integration with the qubit plane and employing a 'charge-shuffle' circuit to move charge between capacitors for voltage pulse generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional room temperature pulse generators are used to control qubit gates, then voltage signals can be generated, but power dissipation and heat generation become excessive
Solution Approach 1:
The patent transitions the control system from room temperature operation to cryogenic temperature operation (dimensional change in temperature space). By placing pulse generators and control circuits at cryogenic temperatures near the qubits, the system eliminates the need for long cable connections and reduces power dissipation while maintaining control capability.
Solution Approach 2:
The patent segments the control system into multiple independent pulse generators, each dedicated to controlling specific qubit gates. This segmentation allows for localized control near the qubits, reducing the need for long interconnections and minimizing power dissipation in cables while maintaining precise voltage signal generation.
2Ease of operation
If long cable connections are used to connect room temperature pulse generators to qubits, then voltage signals can be transmitted, but cable impedance and signal attenuation increase
Solution Approach 1:
The patent moves the pulse generators from room temperature to cryogenic temperature environments, fundamentally changing the operational dimension. This eliminates long cable connections by placing signal sources adjacent to the qubits, thereby removing cable impedance and attenuation issues entirely.
Solution Approach 2:
The patent extracts the pulse generation function from the room temperature environment and relocates it to the cryogenic environment near the qubits. This extraction removes the intermediary cable connections that cause impedance and attenuation problems, directly coupling the control signals to the qubits.
3Productivity
If multiple voltage signals are generated for controlling thousands of qubits, then qubit control capability increases, but power dissipation and heat management become more difficult
Solution Approach 1:
The patent divides the control system into multiple independent pulse generators, each responsible for specific qubit groups. This segmentation enables parallel control of thousands of qubits while localizing power dissipation to small, manageable regions near each qubit, facilitating heat management through cryogenic cooling.
Solution Approach 2:
By operating the control system at cryogenic temperatures (dimensional change in temperature), the patent enables high-density qubit control with manageable power dissipation. The cryogenic environment provides an efficient heat sink, allowing multiple voltage signals to be generated without excessive heat accumulation.
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
Enables efficient control of qubit gates with reduced power consumption and heat dissipation, allowing for the management of thousands of qubits without the need for large amounts of heat dissipation from room temperature voltage pulses.
Implementation Method 1
a charge locking circuit configured to store an amount of charge on a capacitor to generate a voltage signal
Data Source
AI summary
Systems and methods related to charge locking circuits and a control system for qubits are provided. A system for controlling qubit gates includes a first packaged device comprising a quantum device including a plurality of qubit gates, where the quantum device is configured to operate at a cryogenic temperature. The system further includes a second packaged device comprising a control circuit configured to operate at the cryogenic temperature, where the first packaged device is coupled to the second packaged device, and where the control circuit comprises a plurality of charge locking circuits, where each of the plurality of charge locking circuits is coupled to at least one qubit gate of the plurality of qubit gates via an interconnect such that each of the plurality of charge locking circuits is configured to provide a voltage signal to at least one qubit gate.