RF-SQUID Flux Modulation for Scalable Superconducting Qubits
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Solution Overview
Problem
Existing superconducting quantum computers face challenges of high power consumption and poor scalability due to continuous electrical signal input for modulating transition frequencies, which disrupts the low-temperature environment and requires excessive cooling resources.
Innovation Solution
A system utilizing a radio frequency superconducting quantum interference device (RF-SQUID) with a hysteresis parameter greater than 1, integrated on a chip, converts electrical signals into magnetic flux signals through mutual inductance to modulate the transition frequency of superconducting quantum bits, allowing for long-term stable modulation with low energy consumption and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an on-chip microwave transmission line is used to modulate the transition frequency of the superconducting quantum bit, then the transition frequency can be regulated, but the power consumption is high and the scalability is poor
Solution Approach 1:
The patent employs periodic pulsed magnetic flux signals instead of continuous electrical signals to modulate the quantum bit frequency. By applying magnetic flux pulses only when needed for frequency modulation and maintaining silence otherwise, the system achieves frequency control while dramatically reducing average power consumption compared to continuous signal transmission.
Solution Approach 2:
The patent introduces a magnetic flux signal as an intermediary between the electrical control signal and the quantum bit. Instead of directly applying electrical signals to the quantum bit (which generates heat), the system converts electrical signals to magnetic flux signals through a transformer coupling mechanism, enabling indirect control that minimizes thermal interference and power consumption.
2Ease of operation
If continuous electrical signals are input to modulate transition frequencies, then frequency control is achieved, but the low-temperature environment is disrupted and cooling resources are excessive
Solution Approach 1:
The patent uses magnetic flux signals as an intermediary that can penetrate the low-temperature environment without generating significant heat. The magnetic coupling mechanism allows control signals to be transmitted across thermal boundaries, enabling frequency modulation while preserving the integrity of the cryogenic environment required for quantum bit operation.
Solution Approach 2:
The patent replaces the electrical signal transmission system with a magnetic flux-based system. By substituting electrical fields with magnetic fields for the modulation process, the system eliminates the Joule heating effect that would otherwise disrupt the low-temperature environment, allowing stable quantum operation without excessive cooling requirements.
3Adaptability or versatility
If on-chip transmission lines are integrated with quantum bits, then modulation functionality is achieved, but the device complexity increases and scalability is limited
Solution Approach 1:
The patent introduces a magnetic coupling intermediary that enables frequency modulation without requiring direct physical integration of transmission lines with quantum bits. This indirect coupling approach maintains the simplicity of on-chip quantum bit fabrication while adding modulation capability through external magnetic flux application, thereby reducing device complexity.
Solution Approach 2:
The patent separates the modulation function from the quantum bit structure itself. Instead of integrating transmission lines directly into the quantum bit chip (which increases complexity), the system divides the functionality into distinct components: the quantum bit chip and the external magnetic flux generation system. This segmentation allows independent optimization of each component and improves scalability.
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
The RF-SQUID-based system enables stable, low-power modulation of transition frequencies for thousands of quantum bits, maintaining a low-temperature environment and facilitating scalable quantum computing.
Implementation Method 1
An electrical signal (including current signal and voltage signal) in the transmission line may be converted into a magnetic flux signal through a mutual inductance between the transmission line and the quantum bit
Implementation Method 2
the bias line for the radio frequency superconducting quantum interference device is configured to convert the electrical signal into a magnetic flux signal through the mutual inductance between the bias line and the radio frequency superconducting quantum interference device
Implementation Method 3
at least one superconducting quantum bit, where the transition frequency of the superconducting quantum bit is modulated by applying an external magnetic flux
Implementation Method 4
The radio frequency superconducting quantum interference device is a closed loop including a superconducting ring made of a superconducting material and at least one Josephson junction connected with the superconducting ring end to end
Data Source
AI summary
The present disclosure provides a system of modulating a transition frequency of a superconducting quantum bit. The system includes: at least one bias line for a radio frequency superconducting quantum interference device, configured to transmit an electrical signal for adjusting a state of the radio frequency superconducting quantum interference device; at least one radio frequency superconducting quantum interference device located on a chip and placed near the superconducting quantum bit, where a hysteresis parameter of the radio frequency superconducting quantum interference device is greater than 1; and at least one superconducting quantum bit, where the transition frequency of the superconducting quantum bit is modulated by applying an external magnetic flux. The present disclosure further provides a method of modulating a transition frequency of a superconducting quantum bit