Superconducting Ion-Trap Electrodes for Low-Power Quantum Gates
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Solution Overview
Problem
Existing trapped-ion quantum gate technologies face challenges with high power dissipation and fabrication difficulties when using superconducting materials for electrodes, particularly in generating strong magnetic fields and gradients, which degrade with increasing frequency and are hard to deposit and pattern in thick layers.
Innovation Solution
A quantum information processing system using superconducting electrodes with a thickness of at least 0.3 μm and width of 5-500 μm, formed from materials like niobium or ReBCO, capable of carrying currents up to 1 A at frequencies below 1 GHz, combined with normal metal electrodes, to reduce power dissipation and facilitate quantum logic gates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high currents are passed through normal metal electrodes to generate strong magnetic fields for quantum gates, then the magnetic field strength is sufficient, but power dissipation becomes excessive
Solution Approach 1:
The patent changes the electrical resistance parameter of the electrodes by using superconducting materials with near-zero resistance, allowing high currents to flow without generating excessive heat, thus enabling strong magnetic fields for quantum gates while maintaining low power dissipation
Solution Approach 2:
The patent employs composite electrode structures combining superconducting materials (for low resistance current carrying) with normal metals (for magnetic field generation), optimizing both power efficiency and quantum gate performance
2Loss of energy
If thick layers of superconducting material are deposited to reduce power dissipation, then power loss is minimized, but fabrication difficulty increases significantly
Solution Approach 1:
The patent applies superconducting material selectively only in regions where high current carrying is needed, rather than uniformly across all electrodes, reducing the total amount of difficult-to-deposit material while maintaining power efficiency where critical
Solution Approach 2:
The patent uses thin films of superconducting material (50-500 nm) which is less than the thickness required for bulk superconductivity, yet achieves sufficient current carrying capability for the application, making fabrication more feasible
3Speed
If increasing frequency is used to perform quantum logic gates faster, then gate operation speed improves, but magnetic field strength degrades
Solution Approach 1:
The patent designs electrodes that simultaneously serve multiple functions: carrying high currents for strong magnetic fields, operating at high frequencies for fast gates, and maintaining low power dissipation, through the use of superconducting materials with unique properties
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 system effectively reduces power dissipation and enables high-fidelity quantum logic gates by utilizing superconducting electrodes that maintain low power consumption and stability, supporting trapped ions for quantum information processing.
Implementation Method 1
The electrodes include at least one current-carrying electrode which is formed of a superconducting material, and the control system is configured to pass a current through the at least one current-carrying electrode
Implementation Method 2
Low-error quantum gates on trapped-ion systems can be performed using magnetic fields
Implementation Method 3
This can help to reduce power dissipation when trapping charged particles and performing quantum information processing
Data Source
AI summary
A quantum information processing system is disclosed. The system comprises a charged particle trap comprising a substrate and a set of electrodes supported on the substrate, and a control system for controlling the charged particle trap, for applying biases to the set of electrodes for trapping at least one charged particle and performing at least one quantum logic gate on the at least one charged particle. The electrodes include at least one current-carrying electrode which is formed of a superconducting material. The control system is configured to pass a current through the at least one current-carrying electrode having a peak current of at least 1 A.