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Bulletin of the American Physical Society

Preparation of Atom Transfer to 2D Pinhole Diffraction Trap Array for Quantum Information Applications

Justin Jee, Sebastián A. Pardo, Elliot M Lehman, Sergio Aguayo, Glen Gillen, Glen Gillen

Published May 30, 2019• 0 citations
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Creating a quantum computer requires a system of particles that can be well-controlled to achieve quantum operations. We need a large array of these particles – called qubits – with long coherence times, which can be initialized, operated on by single and two qubit gates, and read out. For neutral atoms, the qubit states are stable ground states that interact minimally with the environment, leading to long coherence times. Experimentally, the qubits are manipulated using carefully timed laser beam pulses with controlled frequency and intensity, but the outstanding issue for optically trapping cold atoms is finding a light pattern that can hold an array of individually addressable atoms to perform these quantum operations. To solve this, pinhole diffraction patterns were previously computationally analyzed to trap a 2D array of qubits within localized bright and dark spots. This project implements an injection locked laser into this system to provide a high power, tunable light source for the pinhole diffraction pattern atomic trap. In this project, the injection locked laser system is tuned to and analyzed at 780 nm to observe the locking efficiency as a function of the laser diode temperature or current supplied to the tuned-frequency laser diode, also known as the seed laser. Data taken on the injection lock efficiency over varying seed laser power in the system, current supplied to the seed laser diode, and laser diode temperature confirm that there is a large dependence upon each of these settings. An optimal combination of seed laser diode temperature and current supplied to it can be found to provide an efficient and stable power source for the atomic trap.

•Jan 1, 2018•0 citations
Quantum computers are devices that are able to perform calculations not achievable for classical computers. Although there are many methods for creating a quantum computer, using neutral atoms offers the advantage of being stable when compared to other methods. The purpose of this investigation is to explore possible optical dipole trap configurations that would be useful for implementing a quantum computer with neutral atoms. Specifically, we computationally investigate arrays of pinholes, the diffraction pattern generated by them, and the onset of the Talbot effect in these traps. We manipulate the radius of the pinholes, the number of pinholes in the array, and the distance between adjacent pinholes in order to create trap configurations where the presence/absence of the Talbot effect contributes to the usefulness of the trap for quantum computing. We find configurations with pinhole distances of 80 μm and 100/110 μm respectively satisfied an absence and a strong presence of the Talbot effect.
Creating a quantum computer requires a system of particles that can be well-controlled to achieve quantum operations. We need a large array of these particles – called qubits – with long coherence times, which can be initialized, operated on by single and two qubit gates, and read out. For neutral atoms, the qubit states are stable ground states that interact minimally with the environment, leading to long coherence times. Experimentally, the qubits are manipulated using carefully timed laser beam pulses with controlled frequency and intensity, but the outstanding issue for optically trapping cold atoms is finding a light pattern that can hold an array of individually addressable atoms to perform these quantum operations. To solve this, pinhole diffraction patterns were previously computationally analyzed to trap a 2D array of qubits within localized bright and dark spots. This project implements an injection locked laser into this system to provide a high power, tunable light source for the pinhole diffraction pattern atomic trap. In this project, the injection locked laser system is tuned to and analyzed at 780 nm to observe the locking efficiency as a function of the laser diode temperature or current supplied to the tuned-frequency laser diode, also known as the seed laser. Data taken on the injection lock efficiency over varying seed laser power in the system, current supplied to the seed laser diode, and laser diode temperature confirm that there is a large dependence upon each of these settings. An optimal combination of seed laser diode temperature and current supplied to it can be found to provide an efficient and stable power source for the atomic trap.