Two-photon interference at a telecom wavelength for quantum networking

Anthony Martin; Laurent Labont\'e; Mathis Cohen; Romain Dalidet; S\'ebastien Tanzilli

REVIEW 4 major objections 6 minor 32 references

Two-photon interference at a telecom wavelength for quantum networking

T0 review · 4 major / 6 minor · reviewed 2026-08-11 · deepseek-v4-flash

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Pith's one-line read Two independent telecom sources interfere with 91.9 percent visibility while running without a shared clock.

desk verdict Solid asynchronous HOM demonstration at telecom, but the spectral-overlap mechanism in Sec. 3 is physically wrong as written and needs a rewrite before this is publishable. read the letter →

arxiv 2412.13900 v1 pith:B5GRTW6Y submitted 2024-12-18 quant-ph physics.optics

Mathis Cohen , Laurent Labonté , Romain Dalidet , Sébastien Tanzilli , Anthony Martin This is my paper · ORCID

classification quant-phphysics.optics

keywords Hong-Ou-Mandelinterferencetelecomwavelengthheraldedsingle-photonsourceweakcoherentstateasynchronoussourcesquantumteleportationphotonindistinguishabilitynetworking

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

This paper reports Hong-Ou-Mandel interference between two independent photon sources at a telecom wavelength: an attenuated continuous-wave laser and a heralded single-photon source from spontaneous parametric down-conversion. The two sources run asynchronously with no shared master clock; synchronization is achieved after the fact by using the detection of the heralding photon to gate the laser into 4 ns pulses. The authors measure a raw visibility of 90.7(5)% and a net visibility of 91.9(5)%, matching their model's prediction of 92.4%. The result matters because high-visibility two-photon interference is the core step in quantum teleportation and entanglement swapping, and removing the common clock improves scalability of hybrid quantum networks.

What carries the argument

The load-bearing element is the heralding-triggered intensity modulator that shapes the otherwise continuous coherent laser into 4 ns pulses, combined with a 540 MHz spectral filter on the photon-pair source. The paper also relies on a reciprocal-filtering argument: the effective interfering spectrum is taken to be the inverse Fourier transform of the detection jitter, whose bandwidth (~GHz, since jitter is 150 ps) exceeds the filter bandwidth, thereby justifying spectral overlap between the ~10 kHz coherent laser and the 540 MHz filtered photon. The visibility is computed with a beam-splitter model using density matrices, a POVM detection operator, and the formula V_HOM = 1 - N_indis/N_dis.

What would settle it

Measure the Hong-Ou-Mandel visibility while artificially increasing the detection jitter (for example by adding electronic noise to the time-to-digital converter or using slower detectors) with the laser detuning and the 4 ns gate unchanged. Under the reciprocal-filtering claim, the effective spectral overlap and thus the visibility should drop as jitter rises; under the standard picture, where the photon spectra at the beam splitter are fixed by the filter and the gate pulse, the visibility should remain essentially unchanged. A second check would be a direct measurement of the joint spectral intensity of the two interfering paths.

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Extended reading notes

Core claim

The central claim is that a weak coherent state and a heralded single photon can be made to interfere with near-ideal visibility even when the sources are free-running continuous-wave emitters. By spectrally filtering the down-converted photons to 540 MHz and gating the coherent laser into 4 ns square pulses triggered by the heralding detection, the authors bring the two photons into a common spacetime mode. When the laser is detuned by 6 GHz, the coincidence histogram shows a flat triangular profile; when it is tuned to the degenerate wavelength, a dip appears whose width (914 ps measured vs 925 ps fitted) matches the model. The fits give V_HOM,raw = 90.7(5)% and V_HOM,net = 91.9(5)%, in agreement with the simulated V_HOM(0.01,0.01) = 92.4%.

Load-bearing premise

The claim that the two photons actually overlap in frequency depends on an asserted but underived mechanism in which detection jitter, rather than the sources' intrinsic emission spectra, sets the effective interfering spectrum; if that mechanism is wrong, the engineered-indistinguishability story is unsupported, even though the measured dip might still come from the 4 ns gating pulse.

Editorial extensions

If this is right

At the reported net visibility, time-bin qubit teleportation could reach fidelities above 95 percent, as the paper estimates.
Asynchronous operation removes the need for a common master clock and enables network nodes built from independent, free-running sources.
The telecom-compatible, all-fiber design and the compatibility with quantum memories with hundreds-of-MHz bandwidth support light-to-matter teleportation.
Gating the weak coherent source by the heralding signal suppresses stray light and permits the use of efficient superconducting nanowire detectors.

Reading between the lines

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

If the reciprocal-filtering mechanism holds, detection jitter becomes a tunable resource for spectral matching, suggesting experiments could deliberately shape jitter to control indistinguishability; this is not tested in the paper.
The same asynchrony and gating principle could be applied to entanglement swapping between two independent heralded sources, potentially extending the approach of asynchronous pair-source swapping already cited.
The model's visibility-versus-emission-parameter trade-off could be used as a design chart for balancing count rate and visibility in future relay demonstrations.

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Signed reviews

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Editorial analysis

A structured set of objections, weighed in public.

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

Desk Editor's Note

read the letter

You should know two things about this paper. First, the experimental core is solid: a 91.9(5)% net HOM visibility between a weak coherent source and a heralded single-photon source, both running asynchronously in CW, gated by detection, at telecom wavelength. That is a genuine and useful step for hybrid quantum networks. Second, the paper's own explanation of how the spectral overlap is achieved is wrong, and the error sits in a load-bearing section. The paper is worth engaging with, but it needs revision.

What's new: the asynchronous detection-gated scheme removes the master clock that prior work needed, and the visibility is higher than earlier WCS-HSPS experiments. The model gives 92.4% for alpha = n_bar = 0.01 and the raw data give 90.7(5)%, so the consistency check works. That is a credible measurement.

The soft spot is Section 3. The claim that spectral overlap between a ~10 kHz laser and a 540 MHz-filtered SPDC photon is achieved through 'reciprocal filtering governed by detection jitter' is not correct as stated. Jitter affects coincidence timing, not the spectral wavefunctions of the photons at the beam splitter. You cannot broaden a photon's spectrum with detector timing uncertainty. The likely real mechanism is the 4 ns intensity-modulator gate: a square pulse of that width has a Fourier spectrum of roughly 250 MHz, which can overlap the DWDM passband. The measured dip and visibility are probably genuine, but the stated mechanism is not. The authors need to rewrite that paragraph and either derive the actual spectral overlap from the gate pulse or present data that distinguishes the mechanisms.

Two smaller issues. First, the values alpha and n_bar are said to be about 0.01, but there is no calibration procedure for either one; that matters because the 92.4% 'prediction' is really a post-hoc consistency check. Second, the comparison with Ref. [31] is too thin - that paper also reported near-perfect visibility with a single master laser, so the 'state-of-art' claim should be qualified to the asynchronous setting.

Who is this for? People working on quantum repeaters, teleportation, and hybrid networks will want this result. It deserves a serious referee, but with a required revision of the spectral-overlap explanation and a clearer account of the source parameters. If those are fixed, I would cite it. As it stands, I would not rely on the theory section.

Referee Report

4 major / 6 minor

Summary. The paper reports a Hong-Ou-Mandel (HOM) interference experiment between a weak coherent state (WCS) and a heralded single-photon source (HSPS), both at telecom wavelength and operated asynchronously in the continuous-wave regime. A herald detection gates an intensity modulator that carves 4 ns pulses from the coherent laser, and the authors record a HOM dip with raw visibility 90.7(5)% and net visibility 91.9(5)%. They compare the dip shape with a model based on the spectral filter bandwidth, obtaining agreement within 2%, and they present a simulation of the three-fold coincidence statistics as a function of the coherent amplitude alpha and the mean pair number n_bar. The claimed result is positioned as a scalable, clock-free building block for hybrid quantum networks.

Significance. If the measured visibility is correct, this is a useful demonstration: it shows >90% HOM visibility between two independent, asynchronous telecom sources using fiber-coupled components, and the herald-triggered gating is an interesting way to suppress the continuous background from the WCS. The paper reports error bars, a fit to the dip shape, and an explicit comparison with a simulation. However, the theoretical explanation of how spectral overlap is achieved (Section 3) is not credible as written, and the simulation's agreement relies on parameters chosen to match the data rather than on an independent prediction. The central experimental result should therefore be treated as a strong but incompletely explained measurement.

major comments (4)

[Section 3 (paragraph after Eq. (7))] The claim that spectral overlap between the ~10 kHz coherent laser and the 540 MHz-filtered SPDC photon is 'managed through reciprocal filtering in the time domain, governed by the detection timing jitter' is asserted without derivation. As stated, it is not consistent with standard quantum optics: detection jitter adds classical timing uncertainty to the recorded detection times, but it does not alter the spectral wave functions of the photons at the beam splitter. The 4 ns intensity-modulator gate, whose Fourier-limited bandwidth is ~250 MHz, is the physically plausible source of spectral overlap and is already present in the setup. Please either derive the reciprocal-filtering statement from a model of the two-photon interference amplitude, or replace it with an explanation in terms of the gate pulse; the current text is load-bearing for the 'precise spectral and temporal shaping' narrative.
[Sections 2 and 3 (Fig. 4; text near V_HOM(0.01,0.01)=92.4%)] The simulation in Section 2 models only the effect of multi-photon statistics on the visibility; it assumes perfect spectral and temporal indistinguishability and contains no description of the mode-overlap or gating mechanism. The parameters alpha and n_bar are then set to ~0.01 with the stated aim of obtaining >90% visibility, so the agreement of the simulation with the measured 91.9(5)% is a consistency check, not an independent prediction. This distinction should be stated explicitly, and the simulation should not be presented as validating the measured visibility.
[Section 3 and Fig. 6] The manuscript reports V_HOM,raw and V_HOM,net but does not give the exact definition of the accidental subtraction used to obtain the net value, nor how the grey 'total noise' background is independently measured. Since the central claim depends on these numbers, please specify whether the background is taken from the side bins of the histogram, from dark-count and ASE measurements, or from a fit, and propagate the corresponding uncertainty into the 0.5% error bars.
[Section 3, Eq. (7) and following paragraph] Equation (7) states the standard condition that the photon coherence time 1/Delta_nu_filter (1900 ps) must greatly exceed the detection jitter (150 ps) in order to select one temporal mode. The next paragraph then invokes the same jitter as the mechanism that broadens the effective spectrum of the interfering photons. These two statements attribute opposite roles to the detection jitter and should be reconciled; as written they are in tension.

minor comments (6)

[Abstract and main text] 'State-of-art' should be 'state-of-the-art' in the abstract and in Section 4.
[Eq. (2)] The beam-splitter operator is written as e(i theta(...)); using exp(i theta(...)) would improve clarity.
[Reference [2]] 'A VS Quantum Science' should be 'AVS Quantum Science'.
[References [11] and [32]] References [11] and [32] are the same paper and should be merged or clearly distinguished.
[Before Eq. (5)] The phrase 'It comes :' should be corrected to a complete sentence.
[Data Availability] The statement 'Data are available from the authors on reasonable request' is very limited; providing the raw histograms as supplemental material would strengthen reproducibility.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the reported HOM visibility is measured from coincidence data, not derived from fitted inputs; self-citations are contextual and no load-bearing premise reduces to its own input.

full rationale

Section 2's HOM-visibility model (Eqs. 4-5) is a forward calculation from the coherent-state amplitude α and the mean pair number n̄; the paper does not fit these parameters to the measured V_HOM,raw=90.7(5)% or V_HOM,net=91.9(5)%. The visibility values are extracted by fitting the coincidence histogram, and the simulated V_HOM(0.01,0.01)=92.4% is compared with, rather than used to generate, the measured result. The statement that α=n̄≃0.01 were 'kept low ... to obtain a visibility above 90%' describes a source-intensity operating-point choice, not a fitting of model parameters to the experimental visibility; a poor spectral or temporal overlap would still have produced a low measured visibility, so the agreement is not forced by construction. The self-citations (e.g., Refs. [11,13,32]) are contextual and are not load-bearing premises; no uniqueness theorem is invoked to exclude alternative mechanisms. The Section 3 reciprocal-filtering claim is underived and physically questionable, but that is a correctness/support concern, not circularity: the central experimental visibility claim does not reduce to that assertion. No circular step can be exhibited, so the score is 0.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

The central model depends on standard quantum optics (coherent states, SPDC, beam splitters, POVM detection), plus two experimental conditions: the single-temporal-mode condition (Eq. 7) and the asserted reciprocal-filtering spectral overlap. The emission parameters alpha and n_bar are operationally chosen rather than independently measured, and no new entities are introduced.

free parameters (2)

alpha (coherent state amplitude) = ≈ 0.01
Chosen low to keep visibility above 90% in the model; no independent measurement reported.
n_bar (mean photon pair number) = ≈ 0.01
Chosen low to keep visibility above 90% in the model; no independent measurement reported.

assumptions (4)

standard math Beam splitter transformation and POVM detection model
Standard quantum optics used in Section 2 to compute V_HOM.
domain assumption Single temporal mode condition 1/Delta_nu_filter >> tau_jitter (Eq. 7)
Assumed to select one temporal contribution; parameters satisfy it (1900 ps vs 150 ps).
ad hoc to paper Reciprocal filtering: effective spectral overlap governed by detection jitter
Asserted in Section 3 without derivation; physically questionable, load-bearing for the claimed engineering of indistinguishability.
domain assumption Detectors do not resolve photon number
Standard POVM assumption used in Section 2.

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Cite this review

Pith. "Pith review of Two-photon interference at a telecom wavelength for quantum networking." pith.science (2026). https://pith.science/paper/B5GRTW6Y

@misc{pith2026241213900,
  author       = {Pith},
  title        = {Pith review of: Two-photon interference at a telecom wavelength for quantum networking},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/B5GRTW6Y}},
  note         = {Machine review of arXiv:2412.13900}
}

read the original abstract

The interference between two independent photons stands as a crucial aspect of numerous quantum information protocols and technologies. In this work, we leverage fiber-coupled devices, which encompass fibered photon pair-sources and off-the-shelf optics, to demonstrate Hong-Ou-Mandel interference. We employ two distinct single photon sources, namely an heralded single-photon source and a weak coherent laser source, both operating asynchronously in continuous-wave regime. We record two-photon coincidences, showing a state-of-art visibility of 91.9(5)\%. This work, compliant with telecom technology provides realistic backbones for establishing long-range communication based on quantum teleportation in hybrid quantum networks.

Figures

Figures reproduced from arXiv: 2412.13900 by the authors.

**Figure 1.** Simple schematic of a quantum network operation for long distance propagation, using a single-photon source (SPS), an entangled photon-pair source (EPPS), and a Bell state measurement (BSM) apparatus. Telecom photons stand as ideal carriers for transporting qubits over relatively long distances using standard optical fibers. Also, filtering and routing these photons can be handled advantageously using off-the-shelf … view at source ↗

**Figure 2.** Model-scheme experiment. The coherent state interferes with one member of a photon pair. The separation of paired photons and the combination of the interfering are ensured by beam splitter (BS) operation. Then, detection is performed (D1−3) and heralded two-fold coincidences are recorded (&). 1 and 2 represent the impinging modes at the BS responsible for the HOM interference. The overall density matrix, taking int… view at source ↗

**Figure 3.** Left: 3-fold coincidence probability. The red curve refers to the probability as a function of α with ¯n constant (¯n = 10−3 ). The blue curve represents the reciprocal case, with α constant (α = 10−3 ). Right: Emission probability of the two sources depending on emission parameters α and ¯n. The probability associated with the three first Fock states are represented for each source. To simulate interferences, we im… view at source ↗

Figures from the paper (3 more)

**Figure 4.** Figure 4: Simulation of the visibility of a HOM experiment between independent photons as a function of their emission parameters, α and ¯n. Inset: zoom on the zone for which ¯n and α are below 0.02, corresponding to a visibility above 70% [PITH_FULL_IMAGE:figures/full_fig_p005…

**Figure 5.** Figure 5: Experimental setup of Hong-Ou-Mandel interference. The coherent state is attenuated through a variable optical attenuator (VOA) and passed through a polarization controller (PC). An intensity modulator (IM) generates WCP in the coherent state path. The trigger is sent …

**Figure 6.** Figure 6: Coincidence histograms recorded during 30 min as a function of temporal delay,τ , between SNSPDs. Green curve: data when photons are maximally distinguishable (∆ν = 6 GHz) ; blue curve: data when photons are maximally indistinguishable ∆ν = 0 GHz); red curve: fit based…

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Reference graph

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Pith tools

Reviewed August 11, 2026 · model on record in the stance chip above.

[1] [31]

Characterization of two-photon interference between a weak coherent state and a heralded single photon state

Aojie Xu, Lifeng Duan, Lirong Wang, and Yun Zhang. Characterization of two-photon interference between a weak coherent state and a heralded single photon state. Optics Express, 31(4):5662– 5669, 2023

work page 2023

[2] [1]

Integrated photonics for quantum communications and metrology

Laurent Labont´ e, Olivier Alibart, Virginia D’Auria, Florent Doutre, Jean Etesse, Gregory Sauder, Anthony Martin, ´Eric Picholle, and S´ ebastien Tanzilli. Integrated photonics for quantum communications and metrology. PRX Quantum , 5(1):010101, 2024

work page 2024

[3] [2]

Designing tomorrow’s quantum internet

William J Munro, Nicolo’Lo Piparo, Josephine Dias, Michael Hanks, and Kae Nemoto. Designing tomorrow’s quantum internet. A VS Quantum Science, 4(2), 2022

work page 2022

[4] [3]

Device-independent security of quantum cryptography against collective attacks

Antonio Ac ´ ın, Nicolas Brunner, Nicolas Gisin, Serge Massar, Stefano Pironio, and Valerio Scarani. Device-independent security of quantum cryptography against collective attacks. Physical Review Letters, 98(23):230501, 2007

work page 2007

[5] [4]

Device-independent quantum key distribution secure against collective attacks

Stefano Pironio, Antonio Ac ´ ın, Nicolas Brunner, Nicolas Gisin, Serge Massar, and Valerio Scarani. Device-independent quantum key distribution secure against collective attacks. New Journal of Physics, 11(4):045021, 2009

work page 2009

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Quantum key distribution over 658 km fiber with distributed vibration sensing

Jiu-Peng Chen, Chi Zhang, Yang Liu, Cong Jiang, Dong-Feng Zhao, Wei-Jun Zhang, Fa-Xi Chen, Hao Li, Li-Xing You, Zhen Wang, et al. Quantum key distribution over 658 km fiber with distributed vibration sensing. Physical Review Letters, 128(18):180502, 2022

work page 2022

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Quantum teleportation between remote qubit memories with only a single photon as a resource

Stefan Langenfeld, Stephan Welte, Lukas Hartung, Severin Daiss, Philip Thomas, Olivier Morin, Emanuele Distante, and Gerhard Rempe. Quantum teleportation between remote qubit memories with only a single photon as a resource. Physical Review Letters , 126(13):130502, 2021

work page 2021

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Unconditional quantum teleportation between distant solid-state quantum bits

Wolfgang Pfaff, Bas J Hensen, Hannes Bernien, Suzanne B van Dam, Machiel S Blok, Tim H Taminiau, Marijn J Tiggelman, Raymond N Schouten, Matthew Markham, Daniel J Twitchen, et al. Unconditional quantum teleportation between distant solid-state quantum bits. Science, 345(6196):532–535, 2014

work page 2014