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arxiv: 2605.30483 · v1 · pith:ZNDRAFU2new · submitted 2026-05-28 · 🪐 quant-ph · physics.atom-ph

Rydberg state engineering of trapped ions

Robin Thomm , Vinay Shankar , Natalia Kuk , Marion Mallweger , Ivo Straka , Markus Hennrich This is my paper

Pith reviewed 2026-06-29 06:25 UTC · model grok-4.3

classification 🪐 quant-ph physics.atom-ph
keywords Rydberg ionstrapped ionscoherent population transfermicrowave dressingRabi oscillationsadiabatic transferpolarizability
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The pith

Microwave pulses achieve first coherent population transfer between Rydberg states in trapped ions

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper establishes the first coherent population transfer between Rydberg states in trapped ions. It demonstrates microwave-mediated Rabi oscillations between S and P states with 91.5(5)% efficiency in a single pi-pulse. Adiabatic transfer is also shown between microwave-dressed states that hybridize S and P levels into new eigenstates with tunable polarizability. A sympathetic reader would care because the work allows experiments to combine noise-resilient zero-polarizability states with maximally interacting states in one sequence.

Core claim

Here, we report on the first demonstration of coherent population transfer between different Rydberg states of a trapped ion. We investigate both microwave-mediated Rabi oscillations between Rydberg S and P states and adiabatic transfer between microwave-dressed Rydberg states. Between Rydberg S and P states we achieve a population transfer efficiency of 91.5(5)% in a single microwave π-pulse. Microwave dressing hybridizes the S and P Rydberg states into new eigenstates with tunable polarizability, enabling both noise-resilient zero-polarizability states and maximally interacting states. We demonstrate adiabatic transfer between these zero-polarizability and maximally dressed states, enablin

What carries the argument

Microwave dressing that hybridizes Rydberg S and P states into tunable eigenstates, navigated via Rabi oscillations and adiabatic transfer

Load-bearing premise

The detected population changes arise solely from the intended coherent microwave-driven dynamics between the specified Rydberg levels, without dominant contributions from off-resonant couplings, spontaneous decay during the pulse, or state-detection errors

What would settle it

Time-resolved measurements of state populations after microwave pulses of varying durations that show clear Rabi oscillations reaching 91.5% transfer efficiency at the expected pi-pulse length, with no significant additional loss

Figures

Figures reproduced from arXiv: 2605.30483 by Ivo Straka, Marion Mallweger, Markus Hennrich, Natalia Kuk, Robin Thomm, Vinay Shankar.

Figure 2
Figure 2. Figure 2: FIG. 2. a) Simplified level scheme (see the main text for details), with [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. a) Pulse sequence used for exciting and manipulating the Rydberg state. We start with an ion initialized in its electronic and motional [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Experimental sequence for probing the adiabatic transfer between di [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. MW generation for both principal quantum numbers [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Switching of the MW at di [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Rabi oscillations between [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
read the original abstract

Microwave dressing of Rydberg ions creates tunable eigenstates with controllable polarizability and interaction strength, but coherent navigation between these states has remained elusive. Here, we report on the first demonstration of coherent population transfer between different Rydberg states of a trapped ion. We investigate both microwave-mediated Rabi oscillations between Rydberg S and P states and adiabatic transfer between microwave-dressed Rydberg states. Between Rydberg S and P states we achieve a population transfer efficiency of 91.5(5)% in a single microwave ${\pi}$-pulse. Microwave dressing hybridizes the S and P Rydberg states into new eigenstates with tunable polarizability, enabling both noise-resilient zero-polarizability states and maximally interacting states. We demonstrate adiabatic transfer between these zero-polarizability and maximally dressed states, enabling experiments that combine noise-resilient excitation with strong dipole-dipole interactions and F\"orster resonance control within a single measurement sequence.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 1 minor

Summary. The manuscript reports the first experimental demonstration of coherent population transfer between distinct Rydberg states of a trapped ion. It presents microwave-mediated Rabi oscillations between S and P Rydberg states with a claimed single-pulse transfer efficiency of 91.5(5)%, together with adiabatic transfer between microwave-dressed eigenstates that exhibit tunable polarizability, enabling both zero-polarizability and maximally interacting configurations.

Significance. If the efficiency and coherence claims are substantiated, the work would constitute a notable advance for Rydberg-ion platforms by providing a route to coherent state navigation that combines noise-resilient excitation with controllable dipole-dipole interactions and Förster resonances within a single sequence.

major comments (1)
  1. [Abstract] Abstract: the central claim of 91.5(5)% population transfer efficiency in a single microwave π-pulse between Rydberg S and P states is load-bearing for the 'first demonstration' assertion, yet the manuscript supplies neither raw Rabi data, pulse parameters, detuning dependence, nor an error budget that excludes dominant contributions from off-resonant couplings, finite Rydberg lifetimes, or state-detection infidelity.
minor comments (1)
  1. Figure captions and methods should explicitly state the detection fidelity, microwave pulse duration, and any calibration procedures used to extract the quoted efficiency.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful review and for recognizing the potential significance of our work. We address the major comment below and will strengthen the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim of 91.5(5)% population transfer efficiency in a single microwave π-pulse between Rydberg S and P states is load-bearing for the 'first demonstration' assertion, yet the manuscript supplies neither raw Rabi data, pulse parameters, detuning dependence, nor an error budget that excludes dominant contributions from off-resonant couplings, finite Rydberg lifetimes, or state-detection infidelity.

    Authors: We agree that additional detail is needed to fully substantiate the efficiency claim. While the main text presents Rabi oscillation results leading to the quoted efficiency, we will revise the manuscript to include raw Rabi data (as an additional figure or supplementary material), explicit microwave pulse parameters (duration, Rabi frequency, and detuning), a detuning dependence scan, and a quantitative error budget addressing off-resonant couplings, finite Rydberg lifetimes, and state-detection infidelity. These additions will appear in a new subsection of the results and an expanded methods section. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental measurements of transfer efficiency reported directly from data

full rationale

The paper is an experimental demonstration of coherent population transfer in Rydberg ions, reporting measured efficiencies such as 91.5(5)% from microwave π-pulses and observations of Rabi oscillations and adiabatic transfers. No derivation chain exists that reduces predictions or results to fitted inputs by construction, self-citations, or ansatzes; the central claims are direct experimental outcomes with no equations deriving one quantity from another in a self-referential manner. The reported efficiencies are obtained from population measurements, not from any model that presupposes the result. This is the standard case of a self-contained experimental report with no load-bearing circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Only the abstract is available; no explicit free parameters, ad-hoc axioms, or new entities are stated. Standard quantum mechanics and atomic physics are presupposed but not enumerated.

axioms (1)
  • domain assumption The ion can be prepared and detected in well-defined electronic states whose populations are read out via fluorescence without significant systematic bias.
    Implicit in all trapped-ion Rydberg experiments; required to interpret the reported transfer efficiency.

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Reference graph

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