Surface Ion Trap Chip with Integrated Optical Waveguides
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Solution Overview
Problem
Conventional atomic clocks face challenges in miniaturization and portability due to the need for numerous electrical and optical connections, which complicates packaging and limits their ability to achieve high accuracy and stability with multiple ions.
Innovation Solution
Integration of electrical and optical routing directly on a surface ion trap chip, including multiple waveguides for light delivery and single-photon avalanche detectors for state detection, eliminates the need for feedthroughs and free-space optics, enabling a compact and accurate optically controlled atomic clock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional atomic clock design with multiple electrical and optical connections is used, then accuracy and stability can be maintained, but device complexity and packaging difficulty increase significantly
Solution Approach 1:
The patent merges electrical routing and optical routing directly onto the trap chip substrate. Electrical routing traces and optical waveguides are integrated on the same substrate, eliminating the need for separate feedthroughs and free-space optics. This consolidation reduces packaging complexity while maintaining the functionality required for clock accuracy.
Solution Approach 2:
The substrate serves as an intermediary platform that hosts both electrical routing traces and optical waveguides. This intermediary structure enables the co-integration of electrical and optical connections without requiring complex external packaging, thus resolving the contradiction between maintaining connection functionality and reducing packaging complexity.
2Measurement precision
If multiple ions are trapped and manipulated in the ion trap, then statistical averaging enhances clock accuracy, but the number of required electrical and optical connections increases
Solution Approach 1:
The integrated substrate provides universal routing capabilities that can serve multiple ions simultaneously. The electrical routing traces and optical waveguides are designed to accommodate multiple trapping sites, allowing a single integrated structure to provide connections for multiple ions rather than requiring separate connections for each ion.
Solution Approach 2:
Multiple electrical routing traces and optical waveguides are merged onto the same substrate, creating a scalable integration approach. This merging allows the system to support multiple ions with enhanced accuracy while avoiding the exponential increase in connection complexity that would result from separate connection structures for each ion.
3Volume of moving object
If miniaturization is pursued to improve portability, then device size decreases, but the integration of multiple routing connections becomes more difficult
Solution Approach 1:
The patent transitions from three-dimensional free-space optics and external electrical connections to two-dimensional planar integration on the substrate. Optical waveguides and electrical routing traces are laid out in planar configurations on the substrate surface, enabling miniaturization while maintaining routing functionality. This dimensional change from volumetric to planar architecture facilitates compact integration.
Solution Approach 2:
The patent replaces mechanical connection structures (feedthroughs, free-space optical paths, external wiring) with integrated planar routing structures on the substrate. This substitution eliminates the need for complex mechanical assembly and enables miniaturization, as the routing connections are formed as part of the substrate fabrication process rather than as separate mechanical components.
4Volume of moving object
If feedthroughs and free-space optics are eliminated for miniaturization, then portability improves, but the method for delivering electrical and optical signals to trapped ions must be redesigned
Solution Approach 1:
The substrate is segmented into distinct functional regions: electrical routing traces for electrical signal delivery, optical waveguides for optical signal delivery, and trapping sites for ion confinement. This segmentation allows each routing type to be optimized independently while maintaining overall integration, facilitating manufacturing through specialized fabrication processes for each component type.
Solution Approach 2:
The patent changes the physical state and form of signal delivery from external mechanical connections to integrated planar structures. Electrical routing traces use conductive materials deposited on the substrate, while optical waveguides use dielectric materials with specific refractive indices. These parameter changes in material properties and structural form enable fabrication through standard semiconductor processing techniques, improving ease of manufacture despite the increased integration density.
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 a highly integrated photonic-atomic ion clock that enhances accuracy and stability by enabling the use of multiple ions, improving signal-to-noise ratio and reducing systematic errors, while also making the clock more portable and manufacturable.
Implementation Method 1
A plurality of optical waveguides is monolithically integrated on the substrate and conformed to deliver light to the trapping sites
Implementation Method 2
A plurality of photodetectors is integrated on the substrate and arranged to detect light from respective trapping sites
Implementation Method 3
In a surface ion trap, individual ions are confined by superposed electrostatic and radio frequency (RF) fields
Implementation Method 4
In a surface ion trap, individual ions are confined by superposed electrostatic and radio frequency (RF) fields
Implementation Method 5
a 369-nm Doppler and detection beam
Implementation Method 6
the frequency reference is provided by an optical transition of an atom or ion
Data Source
AI summary
In disclosed apparatus, a plurality of optical waveguides monolithically integrated on a surface ion trap substrate deliver light to the trapping sites. Electrical routing traces defined in one or more metallization levels deliver electrical signals to electrodes of the surface electrode ion trap. A plurality of photodetectors are integrated on the substrate and arranged to detect light from respective trapping sites.