3D Cavity Quantum Transducer for Low-Loss Optical Conversion
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Solution Overview
Problem
Existing quantum transducers using topological insulators face limitations in frequency usage and high light loss in optical fibers during quantum transduction between microwave and optical photons.
Innovation Solution
A quantum transducer design incorporating a three-dimensional cavity resonator with a stack of nonmagnetic and ferromagnetic or antiferromagnetic insulator films, utilizing a magnetic field applicator and microwave transceiver to convert microwave photons into optical photons, and vice versa, without relying on topological insulators, allowing for efficient transduction with low-loss optical frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If topological insulators are used in quantum transducers, then transduction efficiency is improved, but the frequencies of light that can be used are limited and loss of light in optical fiber is large
Solution Approach 1:
The patent changes the material parameters by replacing topological insulators with conventional ferromagnetic insulators (YIG, TIG) and antiferromagnetic insulators, which have different magnetic properties and optical characteristics. This allows operation at different light frequencies (1550 nm band) with lower optical fiber loss while maintaining transduction efficiency through optimized magnetic field interactions and cavity resonator design
Solution Approach 2:
The patent employs composite material structures including stacked layers of ferromagnetic insulators and antiferromagnetic insulators, combined with superconducting qubits and cavity resonators. This composite approach enables simultaneous optimization of magnetic coupling for transduction and optical properties for low-loss transmission
2Productivity
If topological insulators are used in quantum transducers, then transduction efficiency is improved, but the frequencies of light that can be used are limited
Solution Approach 1:
The patent modifies the operational parameters by selecting materials (YIG, TIG, antiferromagnetic insulators) with specific magnetic resonance frequencies that can be tuned to match both microwave qubit frequencies and optical frequencies in the 1550 nm band, thereby expanding the usable frequency range while maintaining high transduction efficiency
Solution Approach 2:
The quantum transducer design achieves multi-functionality by enabling operation across different frequency bands (microwave to optical) using the same basic structure with conventional insulators, making the system adaptable to various quantum communication protocols and frequency standards
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
The design significantly enhances transduction efficiency by increasing the number of insulator films, enabling the conversion of microwave photons to optical photons and vice versa with improved efficiency and reduced light loss in optical fibers.
Implementation Method 1
quantum transduction between microwave photons and optical photons
Implementation Method 2
a magnetic field applicator configured to apply, to the stack, a magnetic field having a component perpendicular to the interface
Implementation Method 3
a three-dimensional cavity resonator
Implementation Method 4
a microwave transceiver configured to transmit and receive a microwave to and from the stack
Data Source
AI summary
A quantum transducer includes a three-dimensional cavity resonator; a stack disposed in the three-dimensional cavity resonator, including a nonmagnetic first insulator film and a ferromagnetic or antiferromagnetic second insulator film that are stacked on each other, and having an interface between the first insulator film and the second insulator film; a magnetic field applicator configured to apply, to the stack, a magnetic field having a component perpendicular to the interface; and a microwave transceiver configured to transmit and receive a microwave to and from the stack. The first insulator film and the second insulator film do not include a topological insulator. The second insulator film has an easy axis of magnetization along a first axis that is perpendicular to the interface. Laser light is emitted to the stack from a direction inclined with respect to the first axis.