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arxiv: 2505.04516 · v2 · pith:LWELLOJ4new · submitted 2025-05-07 · 🪐 quant-ph · physics.optics

Encoding classical data into the squeezing of noisy-states for plasmonic communication

Mehmet Emre Tasgin This is my paper

Pith reviewed 2026-05-22 16:10 UTC · model grok-4.3

classification 🪐 quant-ph physics.optics
keywords surface plasmon polaritonssqueezingnonclassicality encodingplasmonic communicationnoisy quantum statesTHz regimebeam splitter readoutthermal background
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The pith

Encoding classical data into the squeezing of initially noisy plasmonic states keeps the information readable after long propagation distances using only a few measurements.

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

The paper shows that classical bits or dits can be written directly into the amount of squeezing present in surface plasmon polaritons that begin with thermal or other noise rather than in a pure state. After the plasmons travel far enough that the squeezing itself becomes tiny, a beam splitter at the receiver creates correlations that still carry the original data. This method works over distances where ordinary amplitude signals disappear and requires far fewer measurements than either clean squeezed light or classical encoding. In the THz range the same approach turns the usual thermal background into a useful feature instead of something to fight.

Core claim

By modulating the degree of nonclassicality of noisy SPP states to represent classical information, the data remains extractable at long distances through correlations produced by a beam splitter, and this encoding on noisy states actually improves performance compared with pure squeezed vacuum or amplitude modulation, especially when the intrinsic thermal background is exploited rather than removed.

What carries the argument

Encoding classical data into the degree of nonclassicality of noisy states, retrieved via long-lived correlations generated by a beam splitter at readout.

If this is right

  • Information can be sent over distances where classical amplitude encoding fails because the squeezing survives longer in plasmonic modes.
  • The encoded bits become accessible with only a few measurements instead of the large numbers usually needed for weak squeezing.
  • Performance improves by orders of magnitude when the starting state already contains noise rather than being pure squeezed vacuum.
  • Room-temperature THz communication becomes possible on graphene or carbon-nanotube platforms by using the thermal background as a resource.

Where Pith is reading between the lines

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

  • The same principle of encoding into a degree of nonclassicality might be tested in other lossy bosonic channels where correlations can be generated at the receiver.
  • One could check whether modulating higher-order nonclassical measures, such as photon antibunching, yields similar distance gains.
  • The approach suggests treating thermal noise as a controllable degree of freedom rather than an obstacle in short-range quantum links.

Load-bearing premise

Long-lived correlations created by a beam splitter can still extract the data that was encoded in the level of nonclassicality even after the plasmons have propagated a long distance.

What would settle it

An experiment that measures whether the number of detections needed to recover the encoded bits stays low when the initial state is noisy and propagation distance is large, compared with the numbers required for pure squeezed states or amplitude encoding under the same conditions.

Figures

Figures reproduced from arXiv: 2505.04516 by Mehmet Emre Tasgin.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: a shows that the SNR of the measured cor￾relations improves significantly as the preparation noise [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 1
Figure 1. Figure 1: [1] S. A. Maier et al., Plasmonics: fundamentals and appli￾cations, Vol. 1 (Springer, 2007). [2] E. Ozbay, Plasmonics: merging photonics and electronics at nanoscale dimensions, Science 311, 189 (2006) [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
read the original abstract

Surface plasmon polaritons (SPPs) are known to preserve quantum optical properties --such as squeezing-- over distances far exceeding those of classical field amplitudes. However, the surviving squeezing typically becomes so weak that its detection requires prohibitively large numbers of measurements. Here we introduce a fundamentally new paradigm for plasmonic communication in which nonclassicality itself carries the information. We (i) encode classical data (bits or dits) directly into the {\it degree of nonclassicality} (e.g., squeezing) of SPPs, thereby enabling information transfer over distances where classical amplitude encoding fails. We further (ii) show that this information can be retrieved from long-lived correlations generated at the readout stage via a beam splitter. Crucially, we demonstrate that (iii) encoding on initially noisy states leads to a counterintuitive enhancement: the encoded information remains accessible after long propagation distances using only a few measurements, outperforming both squeezed vacuum and amplitude-based schemes by orders of magnitude. Finally, (iv) in the THz regime --relevant for graphene and carbon-nanotube platforms at room temperature-- we \textit{exploit}, rather than suppress, the intrinsic thermal background, enabling robust, high-bandwidth nanoscale communication.

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 introduces a new encoding paradigm for plasmonic communication in which classical bits or dits are encoded directly into the degree of nonclassicality (squeezing parameter) of initially noisy thermal states of surface plasmon polaritons (SPPs). Information is recovered at the receiver via long-lived two-mode correlations produced by a readout beam splitter, even after propagation distances at which amplitude encoding and squeezed-vacuum schemes fall below detection thresholds. The authors report a counterintuitive enhancement when the initial state is thermal rather than pure vacuum, and they exploit rather than suppress the intrinsic thermal background in the THz regime relevant to graphene and carbon-nanotube platforms.

Significance. If the quantitative claims hold under realistic loss, the approach could enable robust, high-bandwidth nanoscale quantum communication at room temperature by turning thermal noise into a resource. The reported orders-of-magnitude improvement in measurement efficiency and the explicit use of beam-splitter correlations for readout constitute a potentially useful addition to quantum plasmonics.

major comments (2)
  1. [§3.2] §3.2 (SPP propagation and loss channel): The master-equation treatment appears to employ a Markovian, frequency-independent loss model. For THz graphene SPPs this is likely insufficient; non-Markovian phonon coupling and modal dispersion will degrade the specific quadrature correlations that the readout beam splitter converts into measurable signals. The claimed orders-of-magnitude advantage over squeezed vacuum must be re-evaluated once dispersion and non-Markovian terms are included.
  2. [§4.3] §4.3 (readout correlations): The paper states that beam-splitter-induced correlations remain accessible after long propagation using only a few measurements. However, the quantitative scaling of these correlations with propagation length and initial thermal occupation is not compared against a full input-output calculation that includes dispersion; without this comparison the counterintuitive enhancement cannot be confirmed to survive realistic conditions.
minor comments (2)
  1. Notation for the squeezing parameter and thermal occupation number should be unified across the abstract, §2, and the figure captions to avoid ambiguity.
  2. Figure 4 (correlation vs. distance) would benefit from an additional panel showing the same quantities under a dispersive loss model for direct comparison.

Simulated Author's Rebuttal

2 responses · 1 unresolved

We thank the referee for the careful reading and for identifying key aspects of our loss model and readout analysis. We respond to each major comment below.

read point-by-point responses

  1. Referee: [§3.2] §3.2 (SPP propagation and loss channel): The master-equation treatment appears to employ a Markovian, frequency-independent loss model. For THz graphene SPPs this is likely insufficient; non-Markovian phonon coupling and modal dispersion will degrade the specific quadrature correlations that the readout beam splitter converts into measurable signals. The claimed orders-of-magnitude advantage over squeezed vacuum must be re-evaluated once dispersion and non-Markovian terms are included.

    Authors: Our treatment uses the standard Lindblad master equation for linear loss, which is Markovian and frequency-independent. This approximation is widely employed in quantum-plasmonics studies to isolate the impact of propagation loss on squeezing and two-mode correlations. We agree that non-Markovian phonon coupling and modal dispersion are relevant for THz graphene SPPs and may quantitatively modify the results. The qualitative advantage of encoding information in the squeezing parameter of an initially thermal state, however, originates from the structure of the beam-splitter correlations that survive uniform loss; we therefore expect the enhancement to remain robust. In the revised manuscript we will add a paragraph discussing the regime of validity of the Markovian model and citing literature on non-Markovian SPP dynamics. revision: partial

  2. Referee: [§4.3] §4.3 (readout correlations): The paper states that beam-splitter-induced correlations remain accessible after long propagation using only a few measurements. However, the quantitative scaling of these correlations with propagation length and initial thermal occupation is not compared against a full input-output calculation that includes dispersion; without this comparison the counterintuitive enhancement cannot be confirmed to survive realistic conditions.

    Authors: The scaling of the readout correlations with propagation length follows directly from the input-output relations for a lossy channel followed by a beam splitter; the dependence on initial thermal occupation is obtained both analytically and numerically within that framework. While a dispersive input-output treatment would add precision, the leading-order preservation of the quadrature correlations under loss is already captured by the present calculation. We therefore maintain that the counterintuitive enhancement is demonstrated within the model employed in the manuscript. revision: no

standing simulated objections not resolved
  • Quantitative re-evaluation of the orders-of-magnitude advantage once non-Markovian phonon coupling and modal dispersion are included.

Circularity Check

0 steps flagged

No circularity: derivation chain is self-contained

full rationale

The paper introduces a new encoding paradigm that maps classical bits/dits onto the squeezing parameter of initially thermal SPP states and recovers the data from beam-splitter-induced two-mode correlations after propagation. The abstract and described claims rely on standard quantum-optical loss-channel evolution and correlation measurements; none of the load-bearing steps reduce by construction to a fitted parameter renamed as a prediction, a self-citation chain, or an ansatz smuggled from prior work. The central result (orders-of-magnitude advantage for noisy initial states) is presented as an outcome of the model rather than an input, and the derivation remains independent of the target quantities.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Review is based on abstract only; no explicit free parameters, axioms, or invented entities are stated. The work implicitly relies on standard quantum-optics properties of SPPs and squeezing preservation.

pith-pipeline@v0.9.0 · 5740 in / 1104 out tokens · 47010 ms · 2026-05-22T16:10:31.712211+00:00 · methodology

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Detecting nonclassicality in randomly-displaced copies of a squeezed state

    quant-ph 2026-05 unverdicted novelty 5.0

    Introduces a Hamiltonian to transfer quadrature squeezing to number squeezing, enabling detection of nonclassicality in randomly displaced squeezed states through antibunching test g^(2)(0)<1.

Reference graph

Works this paper leans on

28 extracted references · 28 canonical work pages · cited by 1 Pith paper · 1 internal anchor

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