June 30, 2025 to July 4, 2025
Europe/Vienna timezone

Exploring the Roles of Nuclear Spins, Quantum Coherence, and Entanglement in Ultracold Chemistry

Jul 1, 2025, 5:00 PM
30m
Invited Speaker Cold and ultracold atoms, molecules and ions, degenerate quantum gases, ultracold plasmas Ultracold 1

Speaker

Kang-Kuen Ni (Harvard University)

Description

Coherence and entanglement are key features of quantum mechanics, although they are susceptible to environmental perturbations. A conventional strategy to entangle qubits with high fidelity is to leverage precisely controlled interactions while keeping qubits from decohering. By leveraging electric dipolar interactions, I will report entangling individual trapped NaCs molecules in optical tweezers and realizing a quantum logic gate with trapped molecules[1]. The bulk of the talk will try to go beyond this paradigm to explore and ask: Can coherence be preserved during chemical reactions and subsequently harnessed to produce entangled products? To address this question, we conduct investigations within the context of an atom-exchange chemical reaction (2KRb -> K2 + Rb2) at a temperature of 500nK[2]. I will share our research findings including surprises and puzzles.

[1] Entanglement and iSWAP gate between molecular qubits, Nature 637, 821 (2025)

[2] Quantum interference in atom-exchange reactions, Science 384, 1117 (2024)

Author

Kang-Kuen Ni (Harvard University)

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