Quantum Bit Array Dynamic Resonant Frequency Control
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Solution Overview
Problem
Existing methods for controlling quantum bits in quantum computers face challenges in setting unique resonant frequencies for a large number of quantum bits, making it difficult to selectively operate each bit due to finite frequency resources.
Innovation Solution
A dynamic resonant frequency changing method is employed, where the resonant frequency of a target quantum bit is dynamically adjusted by modulating the static magnetic field using a DC current through gate electrodes, allowing for distinct resonant frequencies to be achieved without preassigning fixed frequencies to each quantum bit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed resonant frequencies are assigned to each quantum bit, then selective control of quantum bits is achieved, but it becomes difficult to control a large number of quantum bits due to finite frequency resources
Solution Approach 1:
The patent applies the dynamics principle by making the resonant frequency of quantum bits dynamically adjustable rather than fixed. By using gate electrodes to apply voltages that modify the potential landscape, the resonant frequency of individual quantum bits can be changed in real-time. This allows the system to scale to large numbers of quantum bits because frequencies can be dynamically assigned and reassigned as needed, rather than requiring a large pool of fixed frequency resources.
Solution Approach 2:
The patent implements parameter changes by modifying the resonant frequency parameter of quantum bits through voltage control. The gate electrodes apply voltages that change the local potential, thereby changing the resonant frequency of the quantum bit beneath the gate. This parameter control mechanism enables selective addressing of individual quantum bits in large arrays by temporarily assigning unique frequencies to specific targets.
2Adaptability or versatility
If the resonant frequency of a quantum bit is changed dynamically, then selective control in large arrays becomes feasible, but additional control mechanisms and components are required
Solution Approach 1:
The gate electrodes serve multiple functions: they trap electrons to form quantum bits, they adjust the resonant frequencies of quantum bits, and they provide selective addressing capability. This multi-functionality reduces overall system complexity because a single component structure achieves what would otherwise require multiple separate systems.
Solution Approach 2:
The patent merges the frequency control function with the existing gate electrode structure. Instead of adding separate frequency tuning mechanisms, the control voltage applied to gate electrodes simultaneously performs both electron trapping and frequency adjustment functions, simplifying the overall control architecture.
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 method effectively distinguishes the resonant frequency of a control target quantum bit from others, enabling selective control of each quantum bit, even in large arrays, by generating a magnetic field that changes the resonant frequency dynamically, thus overcoming the limitations of fixed resonant frequency methods.
Implementation Method 1
a current for forming a magnetic field that acts on the electron to change the resonant frequency of the quantum bit to which the electron belongs to a value different from a beforementioned resonant frequency to be targeted by control to be performed on the quantum bit
Data Source
AI summary
A quantum bit array comprises a semiconductor layer, an insulating layer arranged on the semiconductor layer, and a plurality of first gate electrodes which are arranged on the insulating layer. The plurality of first gate electrodes are each configured to trap an electron having a predetermined spin state in the semiconductor layer through application of a voltage. The quantum bit array comprises means for causing, in a case where the spin state of the electron is to be changed, a current for forming a magnetic field that acts on the electron to flow through at least one of the plurality of first gate electrodes in an extending direction of the at least one of the plurality of first gate electrodes.