Quantum Bit Array Chip with Dummy-Path Switching for Spin-Rotation Fidelity
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Solution Overview
Problem
Conventional quantum computing technologies face challenges in maintaining high fidelity of spin rotation computations due to long transition times of current supply and high parasitic resistance and capacitance in cable connections, and require numerous input terminals for bias voltage switching.
Innovation Solution
Implementing a quantum bit array chip with a dummy path structure to stabilize parasitic capacitance before switching current paths and using a switch matrix to reduce the number of input terminals for bias voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current supply paths are switched to change resonance frequency of quantum bits, then computation operations can be performed, but long transition times and high parasitic resistance/capacitance reduce fidelity of spin rotation
Solution Approach 1:
The patent introduces a dummy path that is activated before the actual quantum bit path. By pre-stabilizing the parasitic capacitance in the dummy path, the system prepares the electrical environment in advance, allowing the actual path switching to occur without long transition times or instability, thus maintaining high fidelity spin rotation while reducing transition time loss
Solution Approach 2:
The dummy path acts as an intermediary element between the current supply and the quantum bit array. It serves as a buffer that absorbs and stabilizes parasitic capacitance effects, enabling clean and fast switching of current paths without directly exposing the quantum bits to transient electrical disturbances that would degrade computation fidelity
2Ease of operation
If numerous bias voltage switching terminals are provided for each quantum bit control line, then precise control is achieved, but device complexity and number of input terminals increase
Solution Approach 1:
The patent implements a universal bias voltage supply structure where a single set of bias voltage terminals can control multiple quantum bit control lines through time-division multiplexing. The control unit sequentially switches different control lines to the same bias voltage terminal, allowing one terminal to serve multiple functions across different time periods, thus reducing the total number of terminals while maintaining precise control capability
Solution Approach 2:
The patent merges multiple bias voltage control functions into a single integrated control structure. Instead of having separate terminals for each quantum bit control line, the system combines them into a shared bias voltage supply with time-division multiplexing, reducing device complexity while preserving the ability to precisely control each line's bias voltage at the required moment
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 high-speed resonance frequency switching with improved fidelity in spin rotations and reduces the number of input terminals for bias voltage control, enhancing computation accuracy and efficiency.
Implementation Method 1
a quantum dot control gate MOS (gate connected to XQ or YQ) and an interaction control gate MOS (gate connected to XJ) are alternately arranged
Implementation Method 2
cause a current for forming a magnetic field acting on the electrons to flow
Implementation Method 3
a frequency fS of the precession motion is set to 20.01 GHz for a selected bit and 20 GHz for an unselected bit
Implementation Method 4
When the entire array is irradiated with an RF signal having a frequency of 20.01 GHz, spin of only a select bit whose frequency of precession matches that of the RF is rotated
Data Source
AI summary
A quantum bit array chip includes first gate electrodes that are arranged on an insulating layer and trap electrons in a predetermined spin state in a semiconductor layer by applying a voltage, second gate electrodes arranged alternately with the first gate electrodes to cause a current for forming a magnetic field acting on the electrons to flow in an extending direction of the first gate electrodes when the spin state of the electrons is changed, and a third gate electrode. The third gate electrode has the same resistance as the second gate electrodes, and when the spin state of electrons trapped in the first gate electrodes is changed, control is performed to cause a current to flow to the third gate electrode, and after the current is stabilized, stop the flowing of the current to the third gate electrode and cause a current to flow to the second gate electrodes.