Selective Two-Qubit Gate Control Using Barrier Transistors
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Solution Overview
Problem
The existing quantum processors with common gate electrodes face challenges in selectively performing two-quantum bit logic gates, as they often affect multiple quantum bit pairs simultaneously, limiting the functionality of quantum computers.
Innovation Solution
A method is developed to selectively perform two-quantum bit logic gates by controlling inter-quantum bit coupling strength and using a combination of operations to ensure the operation is applied only to specific quantum bit pairs, leveraging transistor configurations and microwave radiation to achieve selective gate operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a common gate electrode method is used to integrate quantum bits, then integration density is improved, but selective controllability of two-quantum bit logic gates deteriorates
Solution Approach 1:
The patent divides the control mechanism into two independent parts: a common gate electrode for global control and individual gate electrodes for selective control. This segmentation allows the system to maintain high integration density through the common gate while enabling precise selective controllability through individually addressable gates for specific quantum bit pairs.
Solution Approach 2:
The patent introduces individual gate electrodes as intermediary control elements between the common gate electrode and the quantum bit pairs. These intermediary gates enable selective modulation of coupling strength for specific quantum bit pairs without affecting other pairs, thus resolving the contradiction between integration and selectivity.
2Ease of operation
If individual gate electrodes are provided for each quantum bit, then selective controllability is improved, but wiring complexity increases
Solution Approach 1:
The patent merges the control functions by having individual gate electrodes share a common gate electrode structure. This combining approach reduces wiring complexity compared to fully independent gates while maintaining selective controllability through the individual gate's ability to modulate coupling for specific quantum bit pairs.
3Speed
If exchange logic gate acts on multiple quantum bit pairs simultaneously, then operation speed is improved, but computational precision deteriorates
Solution Approach 1:
The patent implements dynamic control of coupling strength through individually addressable gate electrodes. This allows the system to switch between simultaneous operation mode (for speed) and selective operation mode (for precision) depending on the computational requirements, resolving the contradiction between operation speed and computational precision.
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
This approach allows for selective two-quantum bit computations, enhancing the functionality of quantum processors and enabling more complex quantum computations with improved energy efficiency.
Implementation Method 1
a single electron is supplemented by an electrostatic effect
Implementation Method 2
using a combination of operations to ensure the operation is applied only to specific quantum bit pairs, leveraging transistor configurations and microwave radiation
Data Source
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AI summary
Provided is a control method of a quantum bit including, when a two-quantum bit computation is performed on a plurality of pairs of quantum bits by a plurality of barrier transistors controlled collectively, selectively performing a one-quantum bit computation on a quantum bit selected from the plurality of pairs of quantum bits to selectively perform a two-quantum bit computation on a desired quantum bit pair selected from the plurality of pairs of quantum bits.