Neutral Atom Trapping With Narrow-Line Cooling for Lower Laser Power
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Solution Overview
Problem
The growth of large-scale quantum computing using neutral atom platforms is limited by the increasing laser power requirements as the number of qubits increases, making it difficult to add more optical tweezers.
Innovation Solution
A method and system for trapping neutral atoms using a reference cooling step to achieve colder atoms by transitioning to a second excited state with a narrower linewidth, allowing for lower laser power trapping in an array of sites, and optionally including preliminary and further cooling steps to achieve even lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If more optical tweezers are added to increase the number of qubits, then the number of qubits increases, but the required laser power grows linearly and eventually becomes unavailable
Solution Approach 1:
The patent changes the cooling parameter from using the first excited state to using the second excited state with a narrower linewidth. This parameter change enables more efficient cooling to lower temperatures, which directly reduces the laser power required for trapping. The narrower linewidth of the second excited state transition allows for more selective and efficient cooling, breaking the linear relationship between qubit number and laser power requirement.
2Temperature
If atoms are cooled to lower temperatures to enable lower power trapping, then trapping power is reduced, but achieving colder temperatures requires more sophisticated cooling mechanisms
Solution Approach 1:
The patent segments the cooling process into two distinct stages: first cooling atoms from the first excited state to an intermediate temperature, then cooling from the second excited state to the final lower temperature. This segmentation allows each cooling stage to be optimized independently, achieving lower final temperatures without proportionally increasing overall system complexity.
Solution Approach 2:
The patent uses the second excited state as an intermediary cooling stage. By introducing this intermediate energy state with a narrower linewidth, the system can transfer atoms through a two-step cooling process rather than attempting direct cooling to the final temperature, thereby achieving lower temperatures with manageable complexity.
3Productivity
If the magneto-optical trap uses a transition with a narrower linewidth, then cooling efficiency is improved and atom temperature is reduced, but the trap configuration becomes more complex
Solution Approach 1:
The patent applies preliminary cooling using the first excited state before transitioning to cooling with the second excited state. This preliminary action prepares the atoms by reducing their initial temperature and population, making the subsequent cooling with the narrower linewidth transition more effective and reducing the overall complexity burden.
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 enables more efficient trapping of neutral atoms with reduced laser power, increasing the number of qubits without the limitations of traditional methods.
Implementation Method 1
cooling down the neutral atoms in at least a magneto-optical trap suitable for imparting a transition between the fundamental state and the second excited state
Implementation Method 2
single atoms are trapped in an array of traps formed by optical tweezers
Data Source
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AI summary
The invention relates to a method for trapping neutral atoms in an array of trapping sites, the neutral atoms having: a fundamental state, a first excited state and a second excited state, the second excited state having a higher principal quantum number than the first excited state, the second excited state having the same hyperfine electronic structure than the first excited state, the method comprising: - a step of cooling down the neutral atoms in at least a magneto-optical trap suitable for imparting a transition between the fundamental state and the second excited state, so as to obtain neutral atoms which are colder than with a magneto-optical trap suitable for imparting a transition between the fundamental state and the first excited state, and - a step of trapping cooled down neutral atoms in an array of trapping sites.