Optical Trap Atom Rearrangement Algorithm
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Solution Overview
Problem
Existing methods for loading atoms into optical traps arrays are inefficient, often leaving half of the traps empty, and require a large number of moves to rearrange atoms, which is impractical for large arrays due to limited atom lifetime and increased collision risks.
Innovation Solution
A method involving the generation of reservoir traps and allowed paths using Voronoi diagrams and Delaunay triangulation, combined with rearrangement algorithms like compression, split-merge, and reordering, to efficiently rearrange atoms and achieve a fully-loaded target traps array, regardless of trap geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard stochastic loading methods are used to fill traps arrays, then the loading process is simple to implement, but only about half of the traps are filled on average, leaving the other half empty
Solution Approach 1:
The patent applies preliminary action by first performing a stochastic loading step to populate traps with atoms, then systematically identifying empty traps and calculating optimal atom transfer paths. This two-stage approach (initial random loading followed by deterministic rearrangement) resolves the contradiction by achieving near-complete trap filling while maintaining reasonable operational simplicity through automated path calculation algorithms
2Productivity
If the shortest-moves-first algorithm is used to rearrange atoms from reservoir traps to target traps, then atoms closest to target traps are prioritized, but the method requires a large number of moves and has high collision risks for large arrays
Solution Approach 1:
The patent introduces intermediate reservoir traps as mediator locations between source traps and target traps. Instead of directly moving atoms from source to target traps, the system uses reservoir traps as temporary holding locations, allowing atoms to be transferred in smaller, safer steps. This intermediary approach reduces collision risks while maintaining rearrangement efficiency, as atoms can be staged and transferred systematically without crossing paths with other atoms
Solution Approach 2:
The patent segments the atom rearrangement process into discrete, calculated moves with identified paths that avoid collisions. By breaking down the complex rearrangement task into individual atom transfer operations with pre-calculated safe paths, the system achieves both high productivity and reliability. Each move is optimized to be collision-free, and the segmented approach allows parallel processing of multiple independent atom transfers
3Productivity
If atoms are moved frequently to fill empty traps, then the target traps array can be fully loaded, but the limited atom lifetime in optical traps makes frequent moves impractical for large arrays
Solution Approach 1:
The patent applies preliminary action by pre-calculating all atom transfer paths and sequences before execution, identifying the most efficient routes that minimize the number of moves required. This upfront planning ensures that atoms are moved the minimum necessary distance to achieve complete trap filling, respecting the limited atom lifetime while achieving 100% trap occupancy
Solution Approach 2:
The system uses self-service by implementing automated algorithms that independently identify empty traps, calculate optimal transfer paths, and execute the rearrangement sequence without human intervention. This automation minimizes the time required for the rearrangement process, allowing complete trap filling to be achieved within the atom lifetime constraint through rapid, computer-controlled operations
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 significantly reduces the number of moves required to load atoms, minimizes collisions, and scales linearly with the number of target traps, making it feasible to load large arrays efficiently and maintain atoms in their traps.
Implementation Method 1
An optical trap, also called optical tweezers in the present description, is an optical system configured to trap a single atom at a predefined location. The trapping is generally obtained by focusing lasers at said location to cool down the atom and maintain its position steady.
Implementation Method 2
Afterwards, atoms in reservoirs traps are rearranged one-by-one into target traps by using a moving optical trap generated with an acousto-optic deflector (AOD).
Data Source
AI summary
The present disclosure relates to a method for arranging atoms in a target array of optical traps with predefined positions comprising: generating a given number of target traps at said predefined positions; generating reservoir traps, said reservoir traps and said target traps forming a traps array; defining allowed paths between traps of the traps array; loading atoms in the traps array to generate an initial loaded traps array; determining the positions of the atoms in the initial loaded traps array; calculating a sequence of moves using a rearrangement algorithm based on said initial loaded traps array and said allowed paths; and applying the sequence of moves to rearrange the atoms in the traps array and form a final loaded traps array.