Heterogeneous Rare-Earth Doped Waveguide for Quantum Coherence
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Solution Overview
Problem
The development of large-scale quantum devices based on rare-earth doped materials is hindered by limitations in coherence properties due to influences from their host matrices.
Innovation Solution
A heterogeneous waveguide structure is proposed, comprising layers of high and low index dielectric materials, with the low index layer doped with rare-earth ions. This structure supports narrow optical transitions and long spin coherence times, enabling chip-scale integration with photonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If rare-earth doped materials are used in solid-state systems, then long spin coherence times are achieved, but coherence properties are degraded due to influences from host matrices
Solution Approach 1:
The patent extracts the rare-earth dopant atoms from the bulk host matrix environment and isolates them within nanoscale voids or defects. This extraction removes the harmful interactions with the host matrix while preserving the beneficial long coherence times of the rare-earth ions.
Solution Approach 2:
The patent creates localized regions with distinct properties - nanoscale voids or defects with specific geometries that provide a protected environment for the rare-earth dopants. These local structures have different properties from the bulk host matrix, providing both isolation from harmful interactions and confinement for maintaining coherence.
2Measurement precision
If narrow optical transitions are achieved in rare-earth systems, then quantum information processing performance is improved, but integration with chip-scale photonics is limited
Solution Approach 1:
The patent changes the physical and chemical parameters of the host matrix by creating nanoscale voids or defects with specific dimensions, compositions, and structures. These parameter changes enable both narrow optical transitions and compatibility with chip-scale photonic integration.
Solution Approach 2:
The patent creates a composite structure combining the host matrix material with nanoscale voids or defects that contain rare-earth dopants. This composite approach allows the system to exhibit both the narrow optical transitions needed for quantum processing and the integration capabilities required for chip-scale photonics.
3Reliability
If heterogeneous waveguide structure is implemented, then coherence properties are enhanced, but device complexity increases
Solution Approach 1:
The patent segments the waveguide structure into distinct layers or regions - including the host matrix, nanoscale voids/defects, and rare-earth dopant locations. This segmentation allows each component to be optimized independently while maintaining overall coherence enhancement.
Solution Approach 2:
The patent implements a nested structure where rare-earth dopant atoms are positioned within nanoscale voids or defects, which are themselves embedded within the larger waveguide host matrix. This nesting provides multiple levels of protection and confinement that enhance coherence while managing structural complexity through hierarchical organization.
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 heterogeneous waveguide structure enhances the coherence properties of rare-earth doped materials, facilitating the development of large-scale quantum devices with improved performance and integration capabilities.
Implementation Method 1
a first layer of high index dielectric material deposited on top of a substrate; a second layer of low index dielectric material deposited on top of the first layer... an index of refraction of the first layer and the third layer is higher than an index of refraction of the second layer
Implementation Method 2
The heterogeneous waveguide structure supports narrow optical transitions and long spin coherence times, enabling chip-scale integration with photonics
Implementation Method 3
Rare-earth (RE) ions such as erbium in solids feature numerous 4f-intra-shell transitions that are effectively shielded from their crystalline surroundings by closed outer shells
Implementation Method 4
allowing for long spin coherence times (up to 6 hours) and narrow optical transitions
Data Source
AI summary
Technologies for a strong rare-earth-ion interactions are disclosed. In the illustrative embodiment, a heterogeneous slot waveguide is formed with two layers of silicon surrounding a layer of Er:Y2O3, resulting in a waveguide that supports a TM mode with a strong confinement of electromagnetic field near the erbium dopants. The strong concentration of electromagnetic field and small mode volume allows for strong interactions between optical fields and the erbium dopants. In some embodiments, the slot waveguide structure may be configured as a microring resonator or a photonic crystal, resulting in small-mode-volume resonators with high Q-factors. In some embodiments, strong electro-optic and/or acousto-optic coupling may be achieved, resulting in quantum transducer able to coherently convert between signals in different systems.