Quantum Computer Using Mott Insulator Thin Film and Spin Vortex
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Solution Overview
Problem
Traditional quantum computers, such as nuclear magnetic resonance type quantum computers, are limited to a maximum of twelve quantum bits, making it difficult to achieve the required properties of quantum state stability, controllability, and large-scale integration, which are necessary for practical applications that require 100 or more quantum bits.
Innovation Solution
A quantum computer using a Mott insulator thin film with doped holes or electrons, where a magnetic field generates spin vortices and loop currents, and a scanning probe microscope adjusts the positions and energy differences of these quantum bits to enable stable and controllable quantum states, allowing for large-scale integration by initializing the loop currents and using a copper oxide superconductor thin film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional quantum bits (nuclear spins, ion traps, quantum optics, quantum dots, superconductor quantum bits) are used, then quantum state stability is maintained, but the number of quantum bits is limited to twelve or fewer
Solution Approach 1:
The invention changes the fundamental parameter of quantum bit definition from nuclear spins or trapped ions to loop currents in Mott insulator thin films. By doping holes or electrons into the Mott insulator and applying magnetic fields, the system generates controllable loop currents that serve as quantum bits. This parameter change enables scaling to 100 or more quantum bits while maintaining controllability through magnetic field manipulation and electromagnetic wave irradiation.
Solution Approach 2:
The invention uses composite material structures: a Mott insulator thin film (such as copper oxide superconductor) doped with holes or electrons, combined with magnetic field generating units and electromagnetic wave irradiation systems. The Mott insulator thin film itself is a composite system exhibiting both insulating properties and the ability to host localized magnetic moments that form loop currents, enabling both stability and scalability.
2Quantity of substance
If the number of quantum bits is increased to 100 or more, then large-scale integration is enabled, but quantum state stability and controllability become difficult to maintain
Solution Approach 1:
The invention segments the quantum computing system into independent Mott insulator thin film elements, each doped with specific holes or electrons that generate individual loop currents. Each quantum bit is spatially separated and independently controllable through localized magnetic field application and electromagnetic wave irradiation. This segmentation allows scaling to 100 or more quantum bits while maintaining individual quantum state stability and controllability.
Solution Approach 2:
The invention replaces mechanical manipulation methods (physical movement of trapped ions or nuclear spin manipulation) with electromagnetic field-based control. Magnetic field generating units and electromagnetic wave irradiation systems provide non-contact, precise control over loop current quantum bits, enabling stable and controllable operation at scale without mechanical complexity.
3Quantity of substance
If Mott insulator thin film is used with doped holes or electrons, then 100 or more quantum bits can be integrated, but manufacturing complexity increases
Solution Approach 1:
The invention changes the material parameter from conventional superconductors or semiconductors to Mott insulator thin films (such as copper oxide superconductors). These materials can be manufactured using established crystal-growing methods, providing a familiar manufacturing pathway. The doping process introduces holes or electrons that localize in the Mott insulator, creating the desired quantum bit states through a relatively simple post-processing step.
4Reliability
If loop currents are used as quantum bits in Mott insulator thin film, then quantum state stability is improved, but manufacturing cost increases
Solution Approach 1:
The invention uses copper oxide superconductor thin films as the Mott insulator substrate, which can be manufactured using established crystal-growing methods. These composite material structures provide both the stability needed for quantum state maintenance and a manufacturing pathway that leverages existing industrial capabilities, thereby controlling costs.
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 the stabilization and controllability of quantum states, enabling the integration of 100 or more quantum bits per element, while keeping manufacturing costs low and optimizing the relationship between quantum bits, thus achieving large-scale integration.
Implementation Method 1
a magnetic field generating unit which applies a magnetic field to the quantum bit substrate to generate a spin vortex centered on each hole or each electron formed at the Mott insulator thin film
Implementation Method 2
to generate a clockwise loop current or a counterclockwise loop current corresponding to the spin vortex
Implementation Method 3
a quantum calculation data supply unit which generates and irradiates a strong electromagnetic wave enabling to cause Rabi oscillation among the respective quantum bits to the quantum bit substrate
Implementation Method 4
a quantum calculation result read-out unit which extracts a quantum calculation result of the quantum bit substrate by specifying a turning direction of the loop current due to polarization dependency of reflected light or transmitted light
Data Source
AI summary
Values of quantum bits used for a quantum computer is stabilized and the number of quantum bits per element is set to be 100 or more while ensuring quantum state stability during calculation of the quantum bits, quantum state controllability, and capability of achieving large-scale integration of quantum bits. Quantum calculation is performed as generating a spin vortex 6 centered on each hole 4 formed at a copper oxide superconductor thin film 3 by applying a magnetic field to a quantum bit substrate 1 having the copper oxide superconductor thin film 3 at which a plurality of the holes 4 are doped and irradiating an electromagnetic wave 19 containing quantum calculation data to the quantum bit substrate 1 in a state that a clockwise loop current 5 or a counterclockwise loop current 5 is generated in accordance with a position of each hole 4 and each spin vortex 6.