AOD Frequency Path Filtering for Scalable Optical Tweezer Control
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Solution Overview
Problem
Existing methods for moving trapped atoms in optical tweezers using acousto-optic deflectors are limited by computational complexity and scalability issues, especially when optimizing multi-step moves, particularly in large quantum register rearrangements.
Innovation Solution
A method for generating a radiofrequency control signal for acousto-optic deflectors using programmable electronic devices, involving digital filtering to smooth frequency modulation paths, allowing efficient movement of optical tweezers based on linear segments and quadratic acceleration/deceleration, implemented in devices like FPGAs and ASICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polynomial equations or Sigmoid functions are used to generate S-Curves for frequency modulation, then the movement smoothness is improved, but the computational complexity increases significantly
Solution Approach 1:
The patent changes the functional form of frequency modulation from complex polynomial/Sigmoid equations to piecewise linear segments. This parameter change simplifies the computational model while maintaining the essential S-curve behavior through controlled acceleration and deceleration phases, thereby reducing computational complexity while preserving movement smoothness
Solution Approach 2:
The patent divides the frequency modulation path into multiple linear segments rather than using a single complex equation. Each segment represents a simplified phase of the S-curve (acceleration, constant velocity, deceleration), making the overall computation more manageable and suitable for real-time control in large quantum registers
2Productivity
If all possible moves are calculated in advance, then the movement optimization is improved, but the memory requirements increase and scalability decreases
Solution Approach 1:
The patent segments the movement planning into local linear segments rather than calculating all possible moves globally. This allows the system to optimize movements on-demand for specific atom transfers without storing comprehensive move tables, significantly reducing memory requirements while maintaining optimization capability for the current operation
Solution Approach 2:
The patent transitions from static pre-calculated move tables to dynamic on-demand frequency path generation. The piecewise linear frequency paths can be generated computationally at the moment of need, allowing the system to adapt to any atom position requirements without being constrained by pre-stored move sets, thereby improving scalability
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
Enables fast and efficient rearrangement of trapped atoms in optical tweezers, reducing computational burden and enabling scalable movement of qubits in quantum processors.
Implementation Method 1
each AOD being suitable to deflect a laser beam forming the optical tweezer as a function of a frequency of a radiofrequency control signal received by the AOD
Data Source
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AI summary
The invention relates to a method for generating a radiofrequency control signal for each acousto-optic deflector, so called AOD (40), of a device (22) controlling an optical tweezer, the method being implemented by a programmable electronic device (42) and comprising the following steps: - the reception of a computed path for the optical tweezer, - the conversion of the computed path into a frequency modulation, so-called frequency path, for each AOD (40), each frequency path being under the form of a linear segment or multiple linear segments, - the filtering of each frequency path by at least one digital filter so as to obtain a corresponding filtered frequency path, and - the generation, for each AOD (40), of a radiofrequency control signal whose frequency is modulated according to the filtered frequency path of the AOD (40).