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REVIEW 3 major objections 4 minor 60 references

Quantum teleportation over a field-deployed hollow-core fibre network

T0 review · 3 major / 4 minor · reviewed 2026-08-01 · deepseek-v4-flash

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Pith's one-line read Quantum teleportation is demonstrated over field-deployed hollow-core fibre links while a 160 mW classical channel co-propagates in the same fibre, with teleportation fidelity above the classical limit.

desk verdict Impressive first teleportation over field-deployed hollow-core fibre; the 'classical data' claim needs a modulation format before I believe the coexistence is with actual traffic. read the letter →

arxiv 2607.25352 v1 pith:6OXA4LWT submitted 2026-07-28 quant-ph

Ri-Yao Song , Ya-Zhou Zhao , Yun-Ru Fan , Yang-Bin Ma , Yan-Yu Wei , Si Shen , Hao Li , Li-Xing You
show 3 more authors
Kai Guo Guang-Can Guo Qiang Zhou
This is my paper
classification quant-ph
keywords quantumteleportationhollow-corefibrequantum-classicalcoexistenceBell-statemeasurementRamannoisesuppressiondeployednetworktime-binqubitsdecoy-statemethod
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper reports a field demonstration of quantum teleportation across a three-node metropolitan network built from hollow-core fibre (HCF), with a classical telecom channel co-propagating in the same fibre at launch powers up to 160 mW. The authors aim to show that air-guiding fibre can replace solid-core fibre as the shared physical layer for quantum and classical communication, because it suppresses spontaneous Raman scattering by roughly a factor of 1000 and preserves photonic indistinguishability without active stabilisation. They measure teleportation fidelities above the classical limit for all tested states, with an average of 86.2±3.0% and a decoy-state-extracted single-photon fidelity of at least 90.4±3.7%. If correct, this points to a plug-and-play, wavelength-agnostic route to quantum networks over existing deployed fibre infrastructure.

What carries the argument

The load-bearing element is the hollow-core fibre itself — specifically an interstitial-tube-assisted double-nested antiresonant nodeless fibre (IT-DNANF) that guides light through an air core. By reducing light–matter interaction, it lowers spontaneous Raman scattering by about three orders of magnitude compared with solid-core fibre, which is what allows a bright classical channel to share the fibre without destroying single-photon interference. A second element is the decoy-state analysis, borrowed from quantum key distribution, used to extract the single-photon fidelity from measurements made with attenuated coherent pulses. The passive polarisation and timing stability of the deployed H

What would settle it

Repeat the teleportation measurement with a modulated classical signal (e.g., 100 Gbps QPSK or PAM4 on the same 1564.68-nm channel) and observe whether the teleportation fidelity and HOM visibility remain above the classical bounds; a significant drop in fidelity or visibility would falsify the claim that the demonstrated coexistence generalises to real data traffic.

Watch

Extended reading notes

Core claim

Using a field-deployed three-node HCF network with links of 9.3 km and 6.0 km, the authors demonstrate quantum teleportation of time-bin qubits with an intermediate Bell-state measurement (BSM). A classical channel at 1564.68 nm is wavelength-multiplexed with the quantum signals, bypassing the BSM node, and the teleportation is verified both by Hong-Ou-Mandel interference and by quantum state tomography of the teleported states. The central quantitative claims are: an average teleportation fidelity of 86.2±3.0%, exceeding the classical bound of 2/3 for all four tested states; a single-photon fidelity of ≥90.4±3.7% extracted via a decoy-state method; and stable performance from 1 mW to 160 mW

Load-bearing premise

The claim that the classical channel is a realistic data traffic channel rests on the assumption that the 1564.68-nm carrier, passed through an 80-GHz filter and amplified, actually carries a data modulation; if it is an unmodulated tone, the coexistence demonstration does not establish compatibility with real classical data traffic.

Editorial extensions

If this is right

  • Hollow-core fibre can host quantum teleportation in the C-band while a C-band classical channel up to 160 mW shares the same fibre, which is not feasible with comparable fidelity in solid-core fibre without wavelength separation.
  • The 1000-fold Raman suppression means that quantum-classical coexistence can operate without the O-band/C-band wavelength-engineering strategy used in prior solid-core demonstrations.
  • If the fibre's passive stability holds in routine deployment, teleportation nodes can run free-running (no active polarisation/timing feedback), simplifying field implementation.
  • The scaling analysis in the paper suggests the classical coexistence power could be pushed toward ~3 W with current noise levels, opening a wider margin for real data traffic.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The paper's classical channel is described only as a filtered, amplified carrier at 1564.68 nm with no stated modulation format or line rate. If the test used an unmodulated tone, the demonstration is of coexistence with bright background light rather than with data traffic; extending the result to real high-speed data would require repeating the measurement with a modulated signal (e.g., QAM or P
  • The seven-hour stability window, while long, does not probe seasonal or multi-day drift. A testable extension would be to monitor HOM visibility and polarization over weeks, and to check resilience to mechanical vibration or fibre movement during maintenance events.
  • Since HCF also reduces latency by about one-third relative to solid-core fibre, a plausible near-term extension is to combine teleportation with erbium-based quantum memories at 1532 nm, the idler wavelength used here, to build a repeater-compatible network segment without frequency conversion.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 4 minor

Summary. This manuscript reports quantum teleportation over a field-deployed metropolitan hollow-core fibre (HCF) network spanning three nodes in Chengdu. Alice prepares time-bin qubits at 1549 nm, Bob generates entangled photon pairs and sends the idler photon through a 6.0-km HCF link to Charlie, where a Bell-state measurement (BSM) is performed jointly with Alice's qubit arriving through a 9.3-km HCF link; Bob's 1532-nm signal photon is analysed locally, so teleportation is verified a posteriori. A classical channel at 1564.68 nm is wavelength-multiplexed with the quantum signals, with launch powers up to 160 mW. The authors report Raman noise suppression by roughly three orders of magnitude relative to solid-core fibre, passive polarization and timing stability over seven hours, HOM visibility 34.5±4.1% at 1 mW, teleportation fringe visibility 61.0±2.7% at 1 mW and 62.0±2.9% at 160 mW, an average QST fidelity of 86.2±3.0%, and a decoy-state-extracted single-photon fidelity of at least 90.4±3.7%, all above the classical bound.

Significance. If the claims are substantiated, this is a significant experimental advance: it would be the first quantum teleportation over a field-deployed HCF network and a strong demonstration that air-guided fibre can suppress Raman noise enough to permit C-band quantum-classical coexistence at launch powers where solid-core fibre would fail without wavelength separation. The paper's strengths include the real three-node metropolitan deployment, direct Raman and stability characterisation, and the explicit attempt to treat the multi-photon component of the weak-coherent-pulse source with a decoy-state method. However, two load-bearing points are insufficiently supported: the 'classical data traffic' description, and the significance of the quoted HOM visibility. Both are local and fixable, but they must be resolved before the central claims can be fully accepted.

major comments (3)
  1. [Methods, 'Quantum–classical coexistence architecture'; Fig. 2] The classical channel is described only as a 1564.68-nm carrier passed through a TBF, EDFA, VOA, DWDMs, and a power meter. No modulation format, line rate, data pattern, or bit-error-rate measurement is reported anywhere in the manuscript. If the source was an unmodulated CW tone, the experiment demonstrates coexistence with bright background light, not with 'high-capacity classical data traffic' as claimed in the abstract and Introduction. This is load-bearing for the central claim; please specify the data modulation and BER, or qualify the claim to 'co-propagating classical light'.
  2. [Quantum teleportation with data; Fig. 4(b)] The HOM visibility 34.5±4.1% is quoted without defining the convention. Under the standard (max−min)/max convention, this value is below the 50% classical limit for two-photon interference, which would contradict the statement that it 'confirm[s] that independently generated photons remain highly indistinguishable.' If a different convention (e.g., (max−min)/(max+min)) was used, say so explicitly and also report the standard visibility. Because indistinguishability is the basis for the BSM claim, this must be clarified.
  3. [Quantum teleportation with data; Fig. 5(d), Ref. [43]] The decoy-state method is used to extract the single-photon fidelity ⟨F^(1)⟩ ≥ 90.4±3.7%, but the manuscript does not describe the estimator, the decoy intensities, or the error propagation, and Ref. [43] is not a decoy-state QKD reference. Please provide the extraction formula and uncertainty budget; otherwise the single-photon fidelity claim is not self-contained. The QST-based fidelities are sufficient for the core teleportation claim, but the DSM claim should either be properly supported or removed.
minor comments (4)
  1. [Introduction; Discussion] The claim 'wavelength-agnostic' goes beyond the single C-band demonstration presented here; consider qualifying it to 'telecom-wavelength' or 'C-band' unless further wavelength coverage is shown.
  2. [Fig. 3(a)] The vertical-axis units for the Raman scattering coefficients are not stated in the main text. Please define the units and the calibration used for both HCF and SCF measurements.
  3. [Deployed HCF infrastructure; Fig. 3(b,c)] The 'free-running, plug-and-play' and 'long-term' claims rest on seven-hour stability data. If this wording is meant to imply longer-term operation, multi-day or seasonal data would be needed; otherwise please temper the wording.
  4. [Fig. 1(b) and Fig. 2] The classical channel is 'co-propagating' in the Bob–Charlie link but 'counter-propagating' with respect to Alice's qubits in the Alice–Charlie link. The abstract's blanket use of 'co-propagating' is potentially ambiguous; specify the propagation direction per link.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: central claims rest on direct measurements and external benchmarks; self-citations are contextual and non-load-bearing.

full rationale

This is an experimental measurement paper, not a derivation paper, so the circularity patterns that apply to fitted-parameter predictions or self-cited uniqueness theorems do not arise. The central quantities—Raman scattering coefficients, HOM and phase-interference visibilities, QST fidelities, and decoy-state single-photon fidelities—are obtained from measured coincidence counts with stated procedures and error bars. The 86.2% average teleportation fidelity and the 90.4% single-photon fidelity are compared against the externally derived classical bound of 2/3 [42]; they are not produced by a model fitted to the same bound. The only explicitly fitted parameter, the 153 Hz mW^-1 noise slope, is used transparently for a labeled scaling extrapolation toward 3 W, not presented as a prediction of a separately measured quantity. Several references involve overlapping authors (e.g., refs. 13, 16, 25, 60), but they are cited as prior experimental demonstrations and technical sources, not as the evidence for this paper's claims, and they do not smuggle in an ansatz or forbid alternatives. The manuscript's omission of the classical channel's modulation format is a correctness/support concern—the claim of 'high-capacity classical data traffic' would be overstated if the channel were only a CW tone—but it is not a circularity, because no derivation reduces to its own input. Under the stated review rules, the paper is self-contained against external benchmarks.

Assumptions & free parameters 1 free parameters · 5 assumptions · 0 invented entities

No free parameters enter the central fidelity claim; one fitted slope supports the Discussion's power-scaling extrapolation. The load-bearing assumptions are the representativeness of the classical channel, the validity of the DSM fidelity extraction, the 7-hour stability window, and the apples-to-apples Raman comparison (in the supplement). No new entities are introduced; the HCF is an established fibre type (IT-DNANF) with prior fabrication literature.

free parameters (1)
  • Raman noise slope = 153 Hz mW^-1
    Linear fit of SNSPD noise count rate vs. launched classical power (Fig. 4a). Used for the Discussion's scaling suggestion that coexistence could extend toward ~3 W (Fig. S10b). Not used in the central fidelity claim.
assumptions (5)
  • domain assumption Raman scattering in air-filled HCF is ~10^3 lower than in silica SCF under comparable excitation
    Underpins the coexistence claim; measured in Fig. 3a with the SCF comparison deferred to Fig. S5. Consistent with known air-vs-silica Raman gain, but the apples-to-apples calibration (length, mode matching, wavelength scan) is in the supplement.
  • domain assumption The 1564.68-nm classical channel is representative of high-capacity classical data traffic
    Methods describe power, filtering, and monitoring but never a modulation format, line rate, or data pattern; the abstract's 'high-capacity classical data traffic' framing depends on this.
  • domain assumption Decoy-state method assumptions transfer from QKD key-rate estimation to single-photon teleportation fidelity
    DSM (Fig. 5d, Tab. S5) requires known per-pulse photon statistics and a channel that attenuates all components identically; its application to fidelity (rather than key rate) is assumed valid.
  • domain assumption The 7-hour stability window represents free-running, long-term operation
    Polarization (<2%) and HOM stability are demonstrated over 7 h (Figs. 3b,c); 'free-running' and 'plug-and-play' in the abstract extrapolate this window to indefinite operation.
  • standard math Standard linear-optics BSM formalism and time-bin coincidence logic
    Bell-state projection onto |ψ^-⟩, three-fold coincidence analysis, and fidelity definitions follow standard quantum optics; the HOM visibility convention is not stated, which complicates checking.

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Pith. "Pith review of Quantum teleportation over a field-deployed hollow-core fibre network." pith.science (2026). https://pith.science/paper/6OXA4LWT

@misc{pith2026260725352,
  author       = {Pith},
  title        = {Pith review of: Quantum teleportation over a field-deployed hollow-core fibre network},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/6OXA4LWT}},
  note         = {Machine review of arXiv:2607.25352}
}
read the original abstract

When a photon and one member of an entangled photon pair are jointly projected onto a Bell-state measurement (BSM), the quantum state of the photon can be transferred to the distant partner of the pair without physically transmitting this information carrier. In real-world deployment, however, teleportation performance is fundamentally bottlenecked by quantum channel impairments, such as loss, noise, and fluctuations, which induce severe decoherence and degrade fidelity. This vulnerability is further exacerbated in scenarios with intense classical data traffic or background light. Realizing scalable quantum networks, therefore, hinges on developing advanced channel architectures capable of supporting both high-fidelity quantum operations and high-capacity classical communications within a shared infrastructure. Towards this end, hollow core fibre (HCF) offers a promising quantum channel resource by combining free-space-like weak light-matter interaction with the stability of fibre-based systems. Here, utilizing a field-deployed metropolitan HCF network spanning three spatially separated nodes in Chengdu, we achieve quantum teleportation with an intermediate BSM under co-propagating classical traffic. Crucially, the HCF links preserve the long-term indistinguishability of photonic qubits without active stabilization, and exhibit a Raman noise approximately three orders of magnitude lower than that of standard solid-core counterparts. This noise suppression enables robust quantum teleportation even alongside classical launch powers up to 160 mW. Our findings establish a classical-data-compatible framework for quantum networking over deployed fibre infrastructure and offer a wavelength-agnostic, plug-and-play, and free-running pathway toward the quantum internet.

Figures

Figures reproduced from arXiv: 2607.25352 by the authors.

Figure 1
Figure 1. FIG. 1. Deployed hollow core fibre (HCF) quantum teleportation network with classical data. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. Schematics of experimental setup. At Alice, laser pulses with a repetition rate of 500 MHz and a pulse width of [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3. Characterization of the deployed HCF links. [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: FIG. 4. Quantum interference and teleportation under quantum-classical coexistence. [PITH_FULL_IMAGE:figures/full_fig_p006_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5. Quantum teleportation coexisting with classical launch power of 160 mW. [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]

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