Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session G08: Atoms and molecules in arrays of optical tweezersInvited Live
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Sponsoring Units: DQI Chair: Adam Kaufman, University of Colorado, Boulder Room: Portland 255 |
Wednesday, June 3, 2020 8:00AM - 8:30AM Live |
G08.00001: Optical Tweezer Arrays of Cold Molecules Invited Speaker: Loic Anderegg Potential wide-ranging scientific applications have led to significant efforts in controlling molecules at the single quantum state level. Aimed squarely at this goal, laser cooling of molecules has led to the first molecular MOTs and, recently, to magnetically and optically trapped molecules. Optical tweezer arrays are a powerful platform, offering the possibility of high-fidelity readout and control of both individual molecules as well as systems. This platform is suited for applications ranging from precision measurement to quantum simulation and quantum information processing. We report on the creation of such an array of CaF molecules. In combination with internal state control of the molecules, we perform state dependent collisional studies of CaF through tweezer merging. We will discuss further prospects for shielding of CaF molecular collisions, as well as progress towards performing quantum simulations. [Preview Abstract] |
Wednesday, June 3, 2020 8:30AM - 9:00AM Live |
G08.00002: Robust M{\o}lmer-S{\o}renson gate for neutral atoms using rapid adiabatic Rydberg dressing Invited Speaker: Ivan Deutsch The Rydberg blockade mechanism is now routinely considered for entangling qubits encoded in clock states of neutral atoms. Challenges towards implementing entangling gates with high fidelity include errors due to thermal motion of atoms, laser amplitude inhomogeneities, and imperfect Rydberg blockade. We show that adiabatic rapid passage by Rydberg dressing provides a mechanism for implementing two-qubit entangling gates by accumulating phases that are robust to these imperfections [1]. We find that the typical error in implementing a two-qubit gate, such as the controlled phase gate, is dominated by errors in the single atom light shift, and that this can be easily corrected using adiabatic dressing interleaved with a simple spin echo sequence. This results in a two-qubit M{\o}lmer-S{\o}renson gate. With a well-designed adiabatic ramp and Rydberg state lifetimes of order 100 $\mu $s, a gate fidelity of 0.995 is achievable with modest experimental parameters. Higher fidelities are possible by increasing the Rydberg state lifetimes, employing states with higher principle quantum numbers and/or in a cryogenic environment. We study also how adiabatic dressing overcomes the demand for a perfect blockade, allowing for a larger separation between atoms that are easily addressed. We these tools in hand we study applications in NISQ information processing. [1] Anupam Mitra,$^{\mathrm{\thinspace }}$Michael J. Martin,$^{\mathrm{\thinspace }}$Grant W. Biedermann,$^{\mathrm{\thinspace }}$Alberto M. Marino,$^{\mathrm{\thinspace }}$Pablo M. Poggi,$^{\mathrm{\thinspace }}$and Ivan H. Deutsch, arXiv:1911.04045. [Preview Abstract] |
Wednesday, June 3, 2020 9:00AM - 9:30AM Live |
G08.00003: Quantum Science with Alkaline Earth Tweezer Arrays Invited Speaker: Manuel Endres Recently cold atoms in optical tweezer arrays have emerged as a versatile platform for quantum science experiments. I will review some of these developments, specifically, atom-by-atom assembly $[1]$ as a fast and simple method to generate defect-free atomic arrays and Rydberg-based quantum simulation of spin models. While already reaching competitive results, these systems are still in their infancy and limitations in coherence, detection fidelity, and scalability remain. I will outline how we can improve on these issues and at the same time open new avenues in quantum metrology by using alkaline earth atoms, followed by an overview of recent results: 1) A record in imaging-fidelity for neutral atoms and demonstration of narrow-line cooling in tweezers $[2,3]$. 2) High-fidelity Rydberg excitation from a clock state, including a record in entanglement-fidelity for two neutral atoms $[4]$. 3) Demonstration of an optical clock with single-atom detection in tweezer arrays $[5]$. \\ \\ $[1]$ Endres et al., Science 354, 1024 (2016) \\ $[2]$ Covey et. al, Phys. Rev. Lett. 122, 173201 (2019) \\ $[3]$ Cooper et al., Phys. Rev. X 8, 041055 (2018) \\ $[4]$ Madjarov*, Covey*, et al., arXiv:2001.04455 (2020) \\ $[5]$ Madjarov et al., Phys. Rev. X 9, 041052 (2019) [Preview Abstract] |
Wednesday, June 3, 2020 9:30AM - 10:00AM Not Participating |
G08.00004: Optical tweezer arrays with gray molasses Invited Speaker: Cindy Regal I will overview our work on using gray molasses for near-deterministic loading and cooling of single atoms for scaling atom-by-atom array assembly. I will also discuss our progress towards low-entropy arrays of ground-state bosonic rubidium atoms, and lastly present a brief overview of a new apparatus that will harness a cryogenic environment for atom arrays. [Preview Abstract] |
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