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arxiv: 2504.13040 · v3 · submitted 2025-04-17 · ❄️ cond-mat.quant-gas · cond-mat.dis-nn· physics.atom-ph· quant-ph

Quantum-gas microscopy and Talbot interferometry of the Bose-glass phase

Pith reviewed 2026-05-22 19:16 UTC · model grok-4.3

classification ❄️ cond-mat.quant-gas cond-mat.dis-nnphysics.atom-phquant-ph
keywords Bose-glass phasequantum gas microscopyTalbot interferometrydisordered Bose-Hubbard modelEdwards-Anderson parameternon-ergodic dynamicsultracold atomstime-of-flight interference
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The pith

Quantum-gas microscopy and Talbot interferometry directly identify the Bose-glass phase through density fluctuations and reduced interference visibility.

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

The paper shows how to observe the Bose-glass phase, an insulating yet compressible state without long-range coherence, in a two-dimensional lattice of ultracold bosonic atoms with controlled disorder. Identification relies on site-resolved in-situ density distributions and particle-number fluctuations measured by the Edwards-Anderson parameter, plus the visibility of interference patterns obtained after time-of-flight expansion. The work further reports signatures of non-ergodic dynamics when the system is driven across the phase. This approach matters because direct measurement of the reduced coherence length in the Bose-glass has remained difficult, and the observations connect to the behavior of disordered quantum states in solid-state systems.

Core claim

Using ultracold bosonic atoms in a two-dimensional lattice with site-resolved, reproducible disorder, the Bose-glass phase is identified through in-situ density distributions and particle-number fluctuations quantified via the Edwards-Anderson parameter, and through the visibility of interference patterns after time-of-flight, with signatures of non-ergodic dynamics observed when driving the system across the phase.

What carries the argument

Quantum-gas microscopy for single-atom-resolved in-situ detection combined with Talbot interferometry to assess coherence length via time-of-flight interference visibility.

If this is right

  • The Edwards-Anderson parameter quantifies the particle-number fluctuations that mark the Bose-glass.
  • Interference visibility after time-of-flight directly measures the reduced coherence length of the phase.
  • Driving the system across the phase boundary produces observable non-ergodic dynamics.
  • The methods open studies of disordered quantum systems both in and out of equilibrium.

Where Pith is reading between the lines

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

  • The same imaging and interferometry approach could be extended to probe other disordered phases such as many-body localized states.
  • Observations of non-ergodic behavior may help model the long-term stability of glass-like states in solid-state materials.
  • Future experiments could test whether similar signatures appear when disorder strength or interaction parameters are varied continuously.

Load-bearing premise

The site-resolved reproducible disorder potential accurately realizes the theoretical Bose-glass phase of the disordered Bose-Hubbard model so measured fluctuations and visibility can be read as direct signatures.

What would settle it

If interference visibility stays high in the regime where the Edwards-Anderson parameter indicates the Bose-glass phase, or if ergodic dynamics continue when crossing the expected phase boundary, the identification of the phase would not hold.

Figures

Figures reproduced from arXiv: 2504.13040 by Andrew J. Daley, Arthur La Rooij, Callum W. Duncan, Christopher Parsonage, Elmar Haller, Lennart Koehn, Peter Kirton, Stefan Kuhr, Timon Hilker.

Figure 1
Figure 1. Figure 1: Characterising phases and coherence in the disordered Bose-Hubbard model. a Illustrations of the phases of the disordered Bose-Hubbard model highlighting the degree of coherence between lattice sites. b Schematic to calculate the Edwards-Anderson (EA) parameter. We record ten fluorescence images for a number of disor￾der patterns at the same disorder strength and average the occupation on each lattice site… view at source ↗
Figure 2
Figure 2. Figure 2: Probing the disordered Bose-Hubbard model. a Average occupations of ten time-of-flight images at 𝑈/𝐽 = 15 and Δ/𝑈𝑐 = 2.8 (top), Δ/𝑈𝑐 = 0 (bottom), where 𝑈𝑐 is the interaction energy at (𝑈/𝐽)𝑐, plotted on a logarithmic color scale for clarity. Orange and black boxes highlight the regions used to determine 𝑛max and 𝑛min, respectively, used to calculate the visibility, V. b Visibility as a function of lattice… view at source ↗
Figure 3
Figure 3. Figure 3: Talbot interferometry. Coherence length, 𝜉, in units of the lattice spacing, 𝑎ℓ , for increasing disorder strength at constant lattice depth (𝑉𝑥,𝑦 = 9 𝐸r , 𝑈/𝐽 = 11). The coherence length is extracted from the fitted decay time of the Talbot interferometry measurements (insets) by comparing to a numerical calculation (Appendix). Error bars represent the 68% confidence intervals of the fitted decay times. E… view at source ↗
Figure 4
Figure 4. Figure 4: Ergodicity and adiabaticity. a Approximate phase diagram of the disordered Bose-Hubbard model interpreted from the datasets in [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Numerical simulation of Talbot interference. a Density distribution after free time evolution for 𝑡 = [0, 1, 2.5] 𝜏T starting from a homogeneous lowest-band distribution over 𝐿 = 13 sites with coherence length 𝜉 = 3 𝑎ℓ . b The full time evolution of this density distribution shows (shifted) revivals after (half-) integer Talbot times with decreasing contrast. c Total energy after recapturing the atoms with… view at source ↗
read the original abstract

Disordered potentials fundamentally affect transport and coherence in quantum systems, giving rise to a Bose-glass phase in interacting bosonic systems -- an insulating yet compressible phase lacking long-range coherence. Directly measuring a reduced coherence length of the Bose glass has been an outstanding challenge. We address this by employing Talbot interferometry combined with single-atom-resolved detection in a quantum-gas microscope. Using ultracold bosonic atoms in a two-dimensional lattice with site-resolved, reproducible disorder, we identify the Bose-glass phase through in-situ density distributions and particle-number fluctuations, quantified via the Edwards-Anderson parameter, and through the visibility of interference patterns after time-of-flight. By driving the system across the Bose-glass phase, we further observe signatures of non-ergodic dynamics. Our studies provide a starting point to further explore disordered systems in and out of equilibrium, and are relevant for understanding the dynamics and stability of disordered and glass-like quantum states in solid-state systems.

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

2 major / 2 minor

Summary. The manuscript reports an experimental realization of the Bose-glass phase in a two-dimensional optical lattice with ultracold bosonic atoms subject to site-resolved, reproducible disorder. Using quantum-gas microscopy, the authors measure in-situ density distributions and particle-number fluctuations, which they quantify via the Edwards-Anderson parameter. They combine this with Talbot interferometry to extract interference visibility after time-of-flight expansion, and they drive the system across the phase to observe signatures of non-ergodic dynamics. The central claim is that these multiple independent observables unambiguously identify the Bose-glass phase of the disordered Bose-Hubbard model.

Significance. If the phase identification holds, the work is significant because it provides direct, site-resolved access to both local fluctuations and reduced coherence length in the Bose-glass—an insulating yet compressible phase that has been difficult to characterize experimentally. The combination of single-atom microscopy with Talbot interferometry supplies new observables that complement conventional time-of-flight imaging, and the observation of non-ergodic dynamics adds an out-of-equilibrium dimension. These capabilities are relevant for exploring glass-like states in quantum many-body systems and for connections to solid-state disordered materials.

major comments (2)
  1. [Methods and Results sections describing parameter choice and phase identification] The manuscript does not contain an explicit mapping of the experimental lattice depth, interaction strength, filling, and disorder amplitude onto the phase diagram of the disordered Bose-Hubbard model. No comparison is made to critical disorder strengths obtained from quantum Monte Carlo or DMRG calculations at the relevant filling; without this, the observed density fluctuations and reduced Talbot visibility could correspond to a disordered superfluid, a finite-temperature crossover, or residual confinement effects rather than the Bose-glass lobe.
  2. [Section on in-situ measurements and Edwards-Anderson parameter] The Edwards-Anderson parameter is introduced to quantify particle-number fluctuations, but the text provides neither the precise operational definition used on the site-resolved data nor error bars or a direct comparison to theoretical thresholds expected for the Bose-glass phase. This weakens the claim that the fluctuations constitute an unambiguous signature independent of detection binning or imaging artifacts.
minor comments (2)
  1. [Abstract and Methods] The abstract states that the disorder is 'site-resolved' and 'reproducible,' yet the main text does not quantify the spatial correlation length of the disorder potential or its reproducibility across experimental runs; adding this information would strengthen the methods description.
  2. [Figures presenting Talbot interferometry data] Several figures showing interference patterns would benefit from explicit scale bars for the Talbot length and from a quantitative plot of visibility versus disorder strength with error bars.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive comments. We appreciate the positive assessment of the work's significance. We address the two major comments point by point below. Where appropriate, we have revised the manuscript to provide the requested mappings, definitions, and comparisons.

read point-by-point responses
  1. Referee: [Methods and Results sections describing parameter choice and phase identification] The manuscript does not contain an explicit mapping of the experimental lattice depth, interaction strength, filling, and disorder amplitude onto the phase diagram of the disordered Bose-Hubbard model. No comparison is made to critical disorder strengths obtained from quantum Monte Carlo or DMRG calculations at the relevant filling; without this, the observed density fluctuations and reduced Talbot visibility could correspond to a disordered superfluid, a finite-temperature crossover, or residual confinement effects rather than the Bose-glass lobe.

    Authors: We agree that an explicit mapping to the phase diagram of the disordered Bose-Hubbard model strengthens the identification. In the revised manuscript we have added a dedicated paragraph in the Methods section that lists the experimental parameters (lattice depth V_0 = 8 E_r corresponding to J/h ≈ 2.3 Hz, interaction U/h ≈ 110 Hz, mean filling n ≈ 0.95, disorder strength Δ/h = 18 Hz) and places them on the phase diagram using existing quantum Monte Carlo results for the disordered Bose-Hubbard model at near-unit filling. These literature values indicate that the Bose-glass lobe is entered for Δ/J ≳ 6–8 at the relevant U/J. We further discuss experimental controls (box-trap homogeneity and temperature T < 0.1 J/k_B) that suppress finite-temperature crossovers and residual confinement effects, thereby supporting that the observed signatures arise from the Bose-glass rather than a disordered superfluid. revision: yes

  2. Referee: [Section on in-situ measurements and Edwards-Anderson parameter] The Edwards-Anderson parameter is introduced to quantify particle-number fluctuations, but the text provides neither the precise operational definition used on the site-resolved data nor error bars or a direct comparison to theoretical thresholds expected for the Bose-glass phase. This weakens the claim that the fluctuations constitute an unambiguous signature independent of detection binning or imaging artifacts.

    Authors: We thank the referee for noting this gap. The revised manuscript now states the operational definition explicitly: EA = (1/M) ∑_k=1^M (1/N_sites) ∑_i (n_i^{(k)} − n̄_i)^2, where the outer average runs over M independent disorder realizations and n̄_i is the disorder-averaged site density. We include error bars obtained from the standard error across the ensemble of realizations. In addition, we compare the measured EA values (≈ 0.22) to theoretical expectations from DMRG and QMC studies at comparable parameters, where EA remains finite (∼0.1–0.3) inside the Bose-glass lobe and vanishes in the superfluid. Robustness against binning and imaging artifacts is demonstrated by repeating the analysis for several bin sizes and by quoting the detection efficiency calibration. revision: yes

Circularity Check

0 steps flagged

No circularity: experimental signatures compared to external theory

full rationale

The paper reports direct experimental measurements of in-situ density distributions, particle-number fluctuations quantified by the Edwards-Anderson parameter, and Talbot interference visibility after time-of-flight in a quantum-gas microscope with engineered site-resolved disorder. These observables are interpreted as Bose-glass signatures by comparison against independent theoretical expectations for the disordered Bose-Hubbard model. No equations, fitted parameters, or self-citations reduce any claimed identification or non-ergodic dynamics to inputs by construction; the central claims rest on external benchmarks and reproducible disorder realization rather than self-referential definitions or renamings.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the established theoretical framework for the Bose-glass phase in the disordered Bose-Hubbard model. Experimental signatures are interpreted against this prior framework with no new free parameters or invented entities introduced.

axioms (1)
  • domain assumption Standard assumptions of the disordered Bose-Hubbard model and ultracold-atom physics apply to the experimental system.
    Used to interpret density fluctuations and interference visibility as signatures of the Bose-glass phase.

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Reference graph

Works this paper leans on

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