Quantum-nondemolition state detection and spectroscopy of single trapped molecules

Mudit Sinhal, Ziv Meir, Kaveh Najafian, Gregor Hegi, Stefan Willitsch

Research output: Contribution to journalArticlepeer-review


Trapped atoms and ions, which are among the best-controlled quantum systems, find widespread applications in quantum science. For molecules, a similar degree of control is currently lacking owing to their complex energy-level structure. Quantum-logic protocols in which atomic ions serve as probes for molecular ions are a promising route for achieving this level of control, especially for homonuclear species that decouple from blackbody radiation. Here, a quantum-nondemolition protocol on single trapped N+2 molecules is demonstrated. The spin-rovibronic state of the molecule is detected with >99% fidelity, and a spectroscopic transition is measured without destroying the quantum state. This method lays the foundations for new approaches to molecular spectroscopy, state-to-state chemistry, and the implementation of molecular qubits.
Original languageEnglish
Pages (from-to)1213-1218
JournalScience (American Association for the Advancement of Science)
Issue number6483
StatePublished - 13 Mar 2020
Externally publishedYes


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