The role of spectator modes in the quantum-logic spectroscopy of single trapped molecular ions

• URL: http://arxiv.org/abs/2504.02642v1
• Date: Thu, 03 Apr 2025 14:37:24 GMT
• Title: The role of spectator modes in the quantum-logic spectroscopy of single trapped molecular ions
• Authors: Mikolaj Roguski, Aleksandr Shlykov, Ziv Meir, Stefan Willitsch,
• Abstract summary: We study the role of spectator modes not directly involved in a measurement protocol relying on a state-dependent optical-dipole force.<n>We identify a Debye-Waller-type effect that modifies the response of the two-ion string to the force and show that cooling all normal modes of the string allows for the detection of the rovibrational ground state of a N$+$ molecular ion.
• Score: 41.94295877935867
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum-logic spectroscopy has become an increasingly important tool for the state detection and readout of trapped atomic and molecular ions which do not possess easily accessible closed-optical-cycling transitions. In this approach, the internal state of the target ion is mapped onto a co-trapped auxiliary ion. This mapping is typically mediated by normal modes of motion of the two-ion Coulomb crystal in the trap. The present study investigates the role of spectator modes not directly involved in a measurement protocol relying on a state-dependent optical-dipole force. We identify a Debye-Waller-type effect that modifies the response of the two-ion string to the force and show that cooling all normal modes of the string allows for the detection of the rovibrational ground state of a N$_2^+$ molecular ion with a fidelity exceeding 99.99% improving on previous experiments by more than an order of magnitude. This marked improvement in sensitivity paves the way for simultaneously identifying multiple rovibrational states at a fixed set of experimental parameters.

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