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arxiv: 2605.27607 · v1 · pith:QPWJOXMP · submitted 2026-05-26 · physics.optics

18-dB on-chip vacuum squeezing in an adaptively poled lithium niobate waveguide

Tushar Sanjay Karnik , Xinyi Ren , Chun-Ho Lee , Bo-Han Wu , Mihir Chaudhari , Clayton Cheung , James Wang , Shi-Yuan Ma
show 11 more authors
Mahmoud Jalali Mehrabad Ian Christen Reshma Kopparapu Kiwon Kwon Yue Yu Sri Krishna Vadlamani Kamila Kunes Quntao Zhuang Dirk Englund Zaijun Chen Mengjie Yu
This is my paper

Reviewed by Pith T0 review T1 audit T2 compute T3 formal T4 kernel 2026-06-29 15:20 UTCgrok-4.3pith:QPWJOXMPrecord.jsonopen to challenge →

classification physics.optics
keywords quantum squeezinglithium niobate waveguideintegrated photonicscontinuous-wave squeezingvacuum squeezingnonlinear opticsquantum sensingthin-film lithium niobate
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The pith

A 1.6-cm lithium niobate waveguide on a chip generates 18 dB of vacuum squeezing.

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

The paper demonstrates continuous-wave quantum squeezing using an adaptively poled thin-film lithium niobate waveguide, reporting 18 dB squeezing and 20 dB anti-squeezing at 1570 nm. A distributed model extracts facet losses, phase noise, and nonlinear strength from the data without prior assumptions on their values. This yields a 95 percent confidence interval of -18.96 to -17.25 dB for squeezing and supports the claim of record performance on an integrated platform. Sympathetic readers would care because squeezed vacuum can improve precision in measurements and enable quantum information tasks that require low-loss on-chip sources. The work supplies the first assumption-free statistical confirmation of such performance in any photonic integrated circuit.

Core claim

We demonstrate continuous-wave quantum squeezing on a chip, achieving 18 dB of squeezing and 20 dB of anti-squeezing at 1570 nm in a 1.6-cm traveling-wave adaptively poled thin-film lithium niobate waveguide. A distributed model independently determines facet losses, phase noise, and nonlinear interaction strength without prior assumptions, enabling rigorous inference of on-chip performance. We estimate a 95% confidence interval of [-18.96, -17.25] dB squeezing and [19.96, 21.35] dB anti-squeezing. These values represent the highest squeezing reported for any integrated photonic platform and the first assumption-free statistical validation of integrated squeezing performance.

What carries the argument

The adaptively poled thin-film lithium niobate waveguide that supports traveling-wave parametric amplification, together with the distributed model that fits loss, noise, and nonlinearity parameters directly from measured quadrature data.

If this is right

  • On-chip squeezed light at this level can be used directly in continuous-variable quantum sensors without external coupling losses.
  • The same waveguide geometry supports integration with other thin-film lithium niobate components for photonic quantum circuits.
  • The assumption-free fitting method can be applied to validate performance of other nonlinear integrated devices.
  • Telecom-wavelength operation at 1570 nm aligns the source with existing fiber networks for quantum communication.

Where Pith is reading between the lines

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

  • Combining the waveguide with on-chip detectors could produce a fully monolithic quantum-enhanced interferometer.
  • The adaptive poling process may be extended to generate squeezing at other wavelengths or with tunable bandwidth.
  • Record squeezing levels reduce the technical overhead for quantum-enhanced metrology experiments that previously required bulk optics.

Load-bearing premise

The distributed model correctly separates the separate effects of facet losses, phase noise, and nonlinear interaction strength from the observed squeezing data.

What would settle it

An independent measurement of the squeezing level at the waveguide output facet, after subtracting only the known external losses, that falls outside the stated confidence interval would falsify the on-chip performance claim.

Figures

Figures reproduced from arXiv: 2605.27607 by Bo-Han Wu, Chun-Ho Lee, Clayton Cheung, Dirk Englund, Ian Christen, James Wang, Kamila Kunes, Kiwon Kwon, Mahmoud Jalali Mehrabad, Mengjie Yu, Mihir Chaudhari, Quntao Zhuang, Reshma Kopparapu, Shi-Yuan Ma, Sri Krishna Vadlamani, Tushar Sanjay Karnik, Xinyi Ren, Yue Yu, Zaijun Chen.

Figure 1
Figure 1. Figure 1: Concept and design of the TFLN PPLN waveguide for on-chip squeezed [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Observation of squeezing from the PPLN nanowaveguide. [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Prediction of on-chip squeezing/anti-squeezing using non-linear equation [PITH_FULL_IMAGE:figures/full_fig_p009_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Estimation of on-chip squeezing using the distributed loss model. [PITH_FULL_IMAGE:figures/full_fig_p010_4.png] view at source ↗
read the original abstract

Quantum squeezed states of light can enhance measurement sensitivity beyond classical limits and enable quantum information processing, but scalable low-loss sources remain challenging. We demonstrate continuous-wave quantum squeezing on a chip, achieving 18 dB of squeezing and 20 dB of anti-squeezing at 1570 nm in a 1.6-cm traveling-wave adaptively poled thin-film lithium niobate waveguide. A distributed model independently determines facet losses, phase noise, and nonlinear interaction strength without prior assumptions, enabling rigorous inference of on-chip performance. We estimate a 95% confidence interval of [-18.96, -17.25] dB squeezing and [19.96, 21.35] dB anti-squeezing. These values represent the highest squeezing reported for any integrated photonic platform and the first assumption-free statistical validation of integrated squeezing performance. Our results establish thin-film lithium niobate as a high-performance, scalable platform for continuous-variable quantum sensing, communications, and photonic computing.

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

0 major / 2 minor

Summary. The paper claims to demonstrate continuous-wave quantum squeezing of 18 dB and anti-squeezing of 20 dB at 1570 nm in a 1.6-cm adaptively poled thin-film lithium niobate traveling-wave waveguide. A distributed model is presented that independently extracts facet losses, phase noise, and nonlinear interaction strength from the data without prior assumptions, yielding 95% confidence intervals of [-18.96, -17.25] dB for squeezing and [19.96, 21.35] dB for anti-squeezing. The work positions these results as the highest reported squeezing on any integrated photonic platform and the first assumption-free statistical validation of such performance.

Significance. If substantiated, the result would mark a substantial advance for integrated continuous-variable quantum optics by achieving record squeezing levels in a scalable thin-film platform. The distributed modeling approach that avoids external priors strengthens the inference of intrinsic device performance and could support applications in quantum sensing and photonic quantum information processing. The explicit confidence intervals provide a quantitative basis for comparing future devices.

minor comments (2)
  1. [§4] The distributed model is described as determining parameters independently, but the main text would benefit from a brief explicit statement (e.g., in §4) confirming that the likelihood construction contains no implicit priors on the extracted quantities.
  2. [Figure 3] Figure captions for the squeezing spectra should specify the exact frequency range and resolution bandwidth used for the reported dB values to facilitate direct comparison with prior integrated squeezing results.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive evaluation and recommendation to accept. The report correctly identifies the significance of the 18 dB on-chip squeezing result, the distributed model, and the assumption-free statistical inference.

Circularity Check

0 steps flagged

No significant circularity; derivation is data-driven and self-contained

full rationale

The paper's central claim rests on a distributed model that extracts facet losses, phase noise, and nonlinear strength directly from measurements without external priors, followed by statistical inference of on-chip squeezing with explicit 95% confidence intervals. No equations or steps in the abstract or described structure reduce a reported prediction to a fitted input by construction, nor does any load-bearing premise collapse to a self-citation chain or self-definitional loop. The model is presented as independently determining parameters from the dataset itself, making the inference externally falsifiable against the raw data rather than tautological. This is the standard case of a self-contained experimental derivation with no circular reduction.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review provides no explicit list of free parameters, axioms, or invented entities; the distributed model is invoked but its internal structure is not described.

pith-pipeline@v0.9.1-grok · 5785 in / 1022 out tokens · 34708 ms · 2026-06-29T15:20:12.968332+00:00 · methodology

discussion (0)

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