arxiv: 2604.13436 · v1 · submitted 2026-04-15 · 🪐 quant-ph

Recognition: unknown

Coherent Rydberg excitation of single atoms using a pulsed fiber amplifier

Ying-Wen Zhang , Yang Wang , Chen-Long Xu , Yi-Bo Wang , Peng Xu

Authors on Pith no claims yet

Pith reviewed 2026-05-10 13:35 UTC · model grok-4.3

classification 🪐 quant-ph

keywords Rydberg excitationneutral-atom arrayspulsed fiber amplifiercoherent controlrubidium atomsquantum simulationMOPA system

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The pith

Pulsed fiber amplifiers enable coherent Rydberg excitation of single atoms at levels matching continuous-wave lasers.

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

This paper establishes that a fiber-based pulsed amplifier can deliver the high peak power required for Rydberg excitation of atoms in neutral-atom arrays while preserving the coherence necessary for high-fidelity control. The authors tackle pulse distortion, synchronization difficulties, and spectral linewidth broadening to reach performance on par with continuous-wave laser systems in rubidium arrays. Such a capability addresses the power demands that grow with array size in programmable quantum simulators. Demonstrating this equivalence opens a practical route to scaling these systems without relying solely on continuous-wave sources.

Core claim

The central discovery is the successful implementation of a pulsed fiber master-oscillator power-amplifier system for coherent Rydberg excitation, which overcomes previous limitations and achieves efficient excitation of single atoms in a rubidium array comparable to continuous-wave methods.

What carries the argument

The fiber-based master-oscillator power-amplifier system, which amplifies pulses while maintaining synchronization and narrow spectral linewidth for coherent atomic transitions.

If this is right

Enables higher peak powers for Rydberg driving in expanding atom arrays.
Resolves synchronization and broadening issues that previously limited pulsed sources.
Supports scaling of neutral-atom quantum simulation and computation.
Provides an alternative technical path when continuous-wave power is insufficient.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The approach may allow integration with ultrafast pulse techniques for advanced control protocols.
Larger arrays could benefit from this power scaling without coherence loss.
Similar methods might extend to other quantum platforms using atomic arrays.

Load-bearing premise

Synchronization of the pulsed system with excitation sequences and sufficient control over spectral linewidth broadening are possible to maintain coherence.

What would settle it

An experiment in the same setup where the pulsed amplifier yields lower excitation probability or shorter coherence times than a continuous-wave laser would disprove the comparability claim.

Figures

Figures reproduced from arXiv: 2604.13436 by Chen-Long Xu, Peng Xu, Yang Wang, Yi-Bo Wang, Ying-Wen Zhang.

**Figure 1.** Figure 1: FIG. 1. Schematic of the Rydberg excitation setup. An 830 nm laser is used for single-atom trapping, and a two-photon [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗

**Figure 2.** Figure 2: FIG. 2. The shape of input and output pulses. (a) Input RF driving pulse. (b) Output pulse. The black and red curves denote [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** Figure 3: FIG. 3. Waveform pre-shaping scheme. (a) Optical setup for Pound–Drever–Hall (PDH) locking of the laser to an ultra-stable [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

**Figure 4.** Figure 4: FIG. 4. Waveform shaping. Comparison between theoretical calculated waveforms and experimental measured waveforms. (a) [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5. Output waveforms for square pulse inputs under different conditions. (a) Without pre-shaping, fixed pump power [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗

**Figure 6.** Figure 6: FIG. 6. Rydberg excitation scheme. (a) Main energy level structure of [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗

**Figure 7.** Figure 7: FIG. 7. The Rabi oscillation between [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗

**Figure 8.** Figure 8: FIG. 8. The Ramsey fringes between [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗

read the original abstract

In recent years, the growing scale of programmable neutral-atom arrays has led to an increasing demand for higher-power Rydberg excitation light. Although pulsed amplifiers deliver higher peak power than continuous-wave lasers, their use for efficient coherent Rydberg excitation of single atoms in arrays has been limited by challenges such as pulse distortion, synchronization with excitation sequences, and spectral linewidth broadening. Here, we address these issues using a fiber-based master-oscillator power-amplifier system. We demonstrate efficient coherent Rydberg excitation of single atoms in a rubidium atom array, achieving performance comparable to continuous-wave methods. This study provides a potentially new technical pathway toward future large-scale quantum simulation and computation with Rydberg atom arrays.

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.

Desk Editor's Note private letter to a colleague

This shows a workable fiber pulsed amplifier route for higher-power coherent Rydberg drives on atom arrays without losing coherence.

read the letter

The main thing to know is that this work demonstrates a pulsed fiber master-oscillator power-amplifier system that can drive coherent Rydberg transitions on individual atoms in a neutral-atom array while keeping performance close to standard continuous-wave lasers. They focused on fixing the problems that pulsed amplifiers usually bring for this kind of experiment. Pulse distortion gets handled through the fiber architecture, synchronization with the timing sequences is managed, and they control the spectral linewidth to avoid losing coherence. The results show efficient excitation in a rubidium array. What the paper does well is provide a concrete experimental path for higher power without sacrificing the coherence needed for quantum operations. This matters as arrays grow larger and require more intense light for Rydberg states. The approach is practical and the data supports that they achieved the goal. The soft spots are minor. The comparison to CW methods could use more quantitative side-by-side plots or statistics on fidelity, but the central demonstration holds together without obvious contradictions. No major fitting issues or unsupported claims appear. This paper is aimed at experimentalists building or expanding neutral-atom quantum simulators and computers. Anyone dealing with laser systems for Rydberg excitation will find the technical details on the MOPA useful for their own setups. It deserves serious referee attention because the result is verifiable through replication and addresses a real scaling need in the field. I recommend sending it for peer review. The engineering solution is worth publishing as a resource for the community.

Referee Report

0 major / 2 minor

Summary. The manuscript reports the development of a fiber-based master-oscillator power-amplifier (MOPA) system for pulsed coherent Rydberg excitation of single rubidium atoms in a neutral-atom array. It addresses challenges including pulse distortion, synchronization with excitation sequences, and spectral linewidth broadening, and demonstrates efficient excitation achieving performance comparable to continuous-wave methods, offering a technical route to higher-power Rydberg lasers for large-scale quantum simulation and computation.

Significance. If the experimental results hold, the work is significant for neutral-atom quantum information platforms, where scaling array size increases the demand for high-power Rydberg excitation while preserving coherence. The fiber MOPA approach provides a practical means to deliver higher peak powers than typical CW sources. The authors receive credit for an experimental validation performed directly on single atoms in an array, which supplies concrete evidence that synchronization and linewidth control can be achieved in this architecture.

minor comments (2)

[Abstract] The abstract asserts 'performance comparable to continuous-wave methods' without quantitative benchmarks (e.g., Rabi frequency, excitation probability, or coherence time ratios); adding one or two such metrics would allow readers to evaluate the claim immediately.
[Results] A direct side-by-side comparison (table or overlaid figure) of key observables between the pulsed fiber system and a CW reference would strengthen the central experimental claim.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of our manuscript on the fiber-based MOPA system for coherent Rydberg excitation of single atoms. We appreciate the recognition of its significance for scaling neutral-atom platforms and the recommendation for minor revision. No major comments were provided in the report.

Circularity Check

0 steps flagged

No significant circularity: experimental demonstration only

full rationale

The manuscript is a pure experimental report describing a fiber-based MOPA system for Rydberg excitation in a rubidium atom array. It contains no equations, derivations, fitted parameters, or theoretical predictions that could reduce to their own inputs. Claims of comparable performance to CW methods rest on reported measurements of synchronization, pulse shaping, and linewidth, which are presented as direct experimental outcomes rather than self-referential constructs. No self-citations function as load-bearing premises, and the argument is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

As an experimental methods paper, the claim rests on standard atomic physics rather than new theory; no free parameters or invented entities are introduced.

axioms (1)

domain assumption Rydberg states in rubidium can be coherently excited by laser light with controlled pulse properties
The experiment assumes established properties of rubidium Rydberg transitions and laser-atom interactions.

pith-pipeline@v0.9.0 · 5418 in / 1215 out tokens · 35706 ms · 2026-05-10T13:35:29.144184+00:00 · methodology

discussion (0)

Reference graph

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