Demonstration of transport in an ion trap design for two-dimensional lattices

Clemens R\"ossler; Fabian Anmasser; Jakob Wahl; Marco Valentini; Matthias Dietl; Michael Pfeifer; Philip C. Holz; Philipp Schindler; Simon Schey; Yves Colombe

arxiv: 2605.16543 · v1 · pith:DCQ4UFFPnew · submitted 2026-05-15 · 🪐 quant-ph

Demonstration of transport in an ion trap design for two-dimensional lattices

Michael Pfeifer , Marco Valentini , Matthias Dietl , Fabian Anmasser , Simon Schey , Jakob Wahl , Philip C. Holz , Clemens R\"ossler

show 2 more authors

Yves Colombe Philipp Schindler

This is my paper

Pith reviewed 2026-05-20 18:36 UTC · model grok-4.3

classification 🪐 quant-ph

keywords ion trapquantum computingtwo-dimensional latticeradial transportDC voltage controlmicrofabricated chipquantum spring array

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The pith

Ion trap chip uses only DC voltages to tune radial distances in 2D lattices

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

The paper introduces a microfabricated ion trap chip for the quantum spring array architecture, arranging ion chains into a two-dimensional lattice where neighboring chains interact through Coulomb coupling that depends on their separation. Prior approaches relied on adjusting the RF pseudo-potential to change radial distances, but this proved experimentally difficult while preserving low heating rates. The new design instead routes ions radially between designated operation zones using only DC voltages applied through specially shaped transition zones. A fused-silica prototype demonstrates controlled radial transport of a single ion and reports measurements of stray fields and heating rates at the trap center. A multi-layer metal version is also fabricated as a route to larger systems.

Core claim

The central claim is that a new ion-trap chip geometry permits radial repositioning of ions between interaction sites by DC-voltage control alone, executed through engineered transition zones that separate transport paths from quantum-operation regions, as verified by moving a single ion across one such zone on a microfabricated prototype while characterizing the central trapping region.

What carries the argument

The transition zones, regions of the electrode layout shaped to support smooth radial ion movement under DC voltages while isolating them from the RF pseudo-potential used in the interaction zones.

If this is right

Radial ion separation in the lattice becomes adjustable without changing RF voltages.
Ions can be moved between distinct interaction zones while remaining confined.
Stray fields and heating rates remain characterizable in the central trap region.
Multi-metal-layer fabrication offers a direct route to larger lattices.
Coulomb coupling in both radial and axial directions can be maintained across the 2D array.

Where Pith is reading between the lines

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

The approach could reduce the number of independent RF channels required for large-scale ion-lattice processors.
Extending the single-ion transport data to chains of several ions would test whether collective motion introduces new heating mechanisms.
Similar electrode layouts might be adapted to other 2D ion-array geometries that currently rely on RF tuning.

Load-bearing premise

The transition zones can be shaped and voltage-tuned so that radial transport introduces neither heating rates nor stray fields large enough to block quantum operations, a premise tested so far only for a single ion at the center of the prototype.

What would settle it

Observation of heating rates or stray-field magnitudes during radial transport that exceed thresholds compatible with high-fidelity two-qubit gates on multiple ions would falsify practical utility of the design.

Figures

Figures reproduced from arXiv: 2605.16543 by Clemens R\"ossler, Fabian Anmasser, Jakob Wahl, Marco Valentini, Matthias Dietl, Michael Pfeifer, Philip C. Holz, Philipp Schindler, Simon Schey, Yves Colombe.

**Figure 2.** Figure 2: FIG. 2. Rf electrodes of the trap with linear and optimized transition zones and corresponding double-well potentials. The [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** Figure 3: FIG. 3. Pseudo-potential [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗

**Figure 4.** Figure 4: FIG. 4. Optical microscopy image of the center of the ion trap [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5. Horizontal projections of the shuttling along the rf [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗

**Figure 6.** Figure 6: FIG. 6. Micromotion modulation index [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗

**Figure 7.** Figure 7: FIG. 7. Calculated shifts [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗

**Figure 8.** Figure 8: FIG. 8. Optical microscopy image of the top-layer of the multi-layer version of the trap. The small black dots are the vias [PITH_FULL_IMAGE:figures/full_fig_p011_8.png] view at source ↗

**Figure 9.** Figure 9: FIG. 9. Optical microscopy image of a transition zone of the [PITH_FULL_IMAGE:figures/full_fig_p011_9.png] view at source ↗

read the original abstract

Microfabricated ion trap chips are at the core of some of the most advanced quantum computers. How a large number of ions is arranged and controlled on an ion trap chip depends on the chosen trap architecture. One such architecture is the quantum spring array (QSA). In the QSA architecture, ion chains are arranged in a two-dimensional lattice and interact with ion chains in neighboring sites in the radial and axial directions of the respective chain. This interaction, or coupling, is mediated by the Coulomb force while keeping ions in separate trapping sites, and scales inversely with the third power of the separation. The capability to control the distance between ions in the lattice is thus essential. In previous works, the radial separation between ions was tuned by controlling the rf pseudo-potential, which revealed to be experimentally challenging to realize while maintaining low heating rates. In this work, we present an ion trap chip design that allows tuning of the radial distance between ions using only dc voltages. The radial transport is executed between different interaction zones, designated for quantum operations, through specifically designed transition zones. A prototype of this type of ion trap chip was microfabricated on fused silica substrate. Its functionality is characterized by demonstrating dc-controlled radial transport of a single ion through a transition zone and measuring stray fields and ion heating rates in the center of the trap. Moreover, the fabrication of a multi-metal layer version of such a trap is presented as a scaling path for the presented chip design.

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

The paper demonstrates DC-controlled radial transport of a single ion through transition zones in a 2D lattice trap design, but reports heating and stray-field data only from the static trap center.

read the letter

The main thing to know is that this work shows a microfabricated ion trap that moves ions radially using only DC voltages through dedicated transition zones, as an alternative to prior RF pseudo-potential tuning. They fabricated a prototype on fused silica, demonstrated the transport for one ion, and reported basic stray-field and heating-rate measurements in the center of the trap, plus a multi-layer scaling route. That is a concrete hardware step for controlling radial spacing in 2D ion lattices without the experimental difficulties of RF methods. The design details and the successful single-ion transport are the parts that stand out as useful and new. The fabrication approach and the explicit contrast with earlier work give the paper a practical engineering focus. The soft spot is the missing characterization during transport. The abstract and the stress-test note both indicate that heating and stray-field data come only from the center position, not while the ion traverses the transition zone under changing DC voltages. This leaves the key assumption—that the dynamic control preserves conditions suitable for quantum operations—untested in the regime the design targets. It is a real but contained gap rather than a fatal flaw, since the basic transport works and the center data provide a starting point. This paper is for experimentalists building or scaling trapped-ion hardware, especially those working on 2D arrays. A reader focused on trap architecture and fabrication would pick up specific design ideas and see a working prototype. It shows clear thinking on the hardware problem and honest reporting of what was actually measured. I would send it to peer review so referees can ask for transport-specific data and assess whether the approach holds up for real quantum operations.

Referee Report

1 major / 1 minor

Summary. The manuscript presents a microfabricated ion trap chip for the quantum spring array (QSA) architecture that enables tuning of radial ion separation in a 2D lattice using only DC voltages, via specifically designed transition zones between interaction sites. A prototype fabricated on fused silica is characterized by demonstrating DC-controlled radial transport of a single ion through a transition zone; stray-field and heating-rate measurements are reported in the trap center. A multi-metal-layer fabrication variant is also described as a scaling route.

Significance. If the design functions as intended, the DC-only radial control could offer a more experimentally tractable alternative to prior RF-pseudo-potential methods for adjusting ion-ion couplings in 2D lattices, potentially aiding scalability of ion-trap quantum processors. The single-ion transport result and multi-layer fabrication path are constructive steps, but the restricted characterization limits the immediate implications for maintaining quantum-operation conditions during transport.

major comments (1)

[Abstract and experimental characterization] Abstract and experimental results section: stray-field and heating-rate data are reported only for the center of the trap. The central claim—that the transition zones support DC-controlled radial transport suitable for quantum operations—requires verification that time-varying DC voltages do not introduce prohibitive heating or position-dependent stray fields while the ion traverses the transition zone; no such data are provided.

minor comments (1)

[Abstract] The abstract refers to 'basic characterization measurements' without reporting any numerical values, uncertainties, or comparison baselines, which would improve clarity of the presented results.

Simulated Author's Rebuttal

1 responses · 1 unresolved

We thank the referee for their constructive feedback and recommendation for major revision. We address the single major comment below, clarifying the scope of our current results while acknowledging limitations in the experimental characterization.

read point-by-point responses

Referee: [Abstract and experimental characterization] Abstract and experimental results section: stray-field and heating-rate data are reported only for the center of the trap. The central claim—that the transition zones support DC-controlled radial transport suitable for quantum operations—requires verification that time-varying DC voltages do not introduce prohibitive heating or position-dependent stray fields while the ion traverses the transition zone; no such data are provided.

Authors: We agree that stray-field and heating-rate measurements are reported only for the trap center. The manuscript demonstrates successful DC-controlled radial transport of a single ion through a transition zone, indicating that the ion remains confined during the move. However, we did not perform position-resolved measurements of heating rates or stray fields during transport or within the transition zone itself under time-varying DC voltages. These data would strengthen claims regarding suitability for quantum operations. In the revised manuscript, we have updated the abstract and experimental section to explicitly state the limited scope of the current characterization and to identify such measurements as important future work. revision: partial

standing simulated objections not resolved

Measurements of heating rates and position-dependent stray fields while the ion traverses the transition zone under time-varying DC voltages are not available in the current dataset.

Circularity Check

0 steps flagged

No circularity: experimental demonstration with no derivation chain

full rationale

The manuscript is a hardware demonstration of a microfabricated ion trap chip. It reports fabrication details, DC-controlled radial transport of a single ion through a transition zone, and stray-field/heating measurements performed in the trap center. No equations, theoretical derivations, fitted parameters, or modeling steps are present that could reduce to self-citation, self-definition, or renamed inputs. All claims rest on direct experimental observation and device characterization rather than any self-referential chain, satisfying the criteria for a self-contained result.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

This is an experimental hardware paper with no mathematical derivations, fitted parameters, or postulated entities; all claims rest on microfabrication and direct ion transport measurements.

pith-pipeline@v0.9.0 · 5822 in / 1090 out tokens · 45587 ms · 2026-05-20T18:36:10.726273+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Foundation/AlexanderDuality.lean alexander_duality_circle_linking (D=3 forcing) unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

We present an ion trap chip design that allows tuning of the radial distance between ions using only dc voltages. The radial transport is executed between different interaction zones... through specifically designed transition zones.
IndisputableMonolith/Cost/FunctionalEquation.lean washburn_uniqueness_aczel (J-cost uniqueness) unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

The shape of the transition zones was described by a cubic B-spline... cost function C(B) = w1 ∫ ω²(ξ(z)) dz + w2 ∫ |∂φPP/∂t̂| dz

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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