Quantum Bit Cell With Local Microwave Oscillator
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Solution Overview
Problem
The integration of multiple solid-state element quantum bits is hindered by the large size of high-frequency transmission lines and the occurrence of crosstalk, which complicates the construction of multi-bit integrated circuits and selective operation of individual quantum bits.
Innovation Solution
A quantum bit cell with a spin torque oscillator capable of emitting a microwave with a propagation distance of 1 μm or less, integrated with a solid-state element quantum bit, utilizing structures such as spin valve-type, magnetic vortex, or spin orbit torque-excited elements, allowing for close proximity and controlled microwave emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-frequency transmission lines are used to supply microwave to solid-state element quantum bits, then microwave control is achieved, but the area increases and manufacturing becomes difficult
Solution Approach 1:
The patent extracts the microwave generation function from external equipment and integrates it directly into the quantum bit cell structure. Each quantum bit cell includes an oscillation element that generates microwave locally, eliminating the need for external high-frequency transmission lines and their associated complexity.
Solution Approach 2:
The patent introduces magnetic field confinement structures (such as magnetic insulator layers or patterns) as intermediaries to control and confine the microwave magnetic field generated by oscillation elements. This allows selective microwave delivery to target quantum bits while preventing crosstalk to adjacent bits, solving the selectivity problem without requiring complex transmission line routing.
2Reliability
If high-frequency transmission lines are used to supply microwave, then microwave delivery is achieved, but crosstalk occurs affecting other quantum bits
Solution Approach 1:
The patent implements local quality by confining the microwave magnetic field to specific local regions around each quantum bit cell using magnetic field confinement structures. These structures create localized magnetic field distributions that decay rapidly with distance, ensuring that each oscillation element's microwave affects only its intended target quantum bit and not adjacent cells.
Solution Approach 2:
The patent converts the potentially harmful crosstalk effect into a beneficial localized field confinement mechanism. By using magnetic insulator materials with specific permeability characteristics, the structures that could potentially channel unwanted fields instead create magnetic field boundaries that contain and direct the microwave energy precisely where needed.
3Reliability
If micromagnet is placed in transmission destination to suppress crosstalk, then selective microwave supply is achieved, but the size becomes too large for integration
Solution Approach 1:
The patent merges the microwave generation function and the field confinement function into a single integrated quantum bit cell structure. The oscillation element and magnetic field confinement structures are combined at the same location, eliminating the need for separate micromagnet components placed near each quantum bit. This integration dramatically reduces the area required while maintaining selective operation capability.
Solution Approach 2:
The patent changes the scale and characteristics of the magnetic field confinement structures from macroscopic micromagnets (tens of micrometers) to nanoscale patterns integrated with the oscillation elements. By changing the size parameter and using layered magnetic insulator materials, the confinement structures achieve the same selective field control function at a much smaller scale compatible with quantum bit cell dimensions.
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 configuration enables an easy-to-integrate and compact quantum bit cell structure, reducing crosstalk and facilitating the dense arrangement of quantum bits in integrated circuits while maintaining effective microwave control.
Implementation Method 1
a spin torque oscillator capable of emitting a microwave with a propagation distance of 1 μm or less and having a maximum diameter of 1 μm or less
Implementation Method 2
a solid-state element quantum bit arranged near the spin torque oscillator at an interval of the propagation distance or less, where a quantum two-level system is controlled by the microwave
Data Source
AI summary
The present invention addresses the problem of providing a quantum bit cell and a quantum bit integrated circuit having an easy-to-integrate structure. The quantum bit cell of the present invention including a spin torque oscillator capable of emitting a microwave with a propagation distance of 1 μm or less and having a maximum diameter of 1 μm or less, and a solid-state element quantum bit arranged near the spin torque oscillator at an interval of the propagation distance or less, where a quantum two-level system is controlled by the microwave.