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REVIEW 4 major objections 5 minor 34 references

The Sound of Entanglement

T0 review · 4 major / 5 minor · reviewed 2026-08-04 · deepseek-v4-flash

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Pith's one-line read A live musical and visual performance was driven in real time by entangled-photon correlations measured at a Bell value of about 2.45, above the classical limit of 2.

desk verdict First live Bell-test-driven music, with a real gap: the S-value that carries the non-classical claim is reported without error bars or calibration data. read the letter →

arxiv 2509.08892 v1 pith:662QIX2W submitted 2025-09-10 quant-ph cs.ETcs.MMcs.SD

Enar de Dios Rodríguez , Philipp Haslinger , Johannes Kofler , Richard Kueng , Benjamin Orthner , Alexander Ploier , Martin Ringbauer , Clemens Wenger This is my paper · ORCID
classification quant-phcs.ETcs.MMcs.SD
keywords entanglementBelltestCHSHinequalityquantumaleatoricmusicrandomnesssonificationliveperformanceart
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 introduces 'quantum aleatoric music' and reports two live performances in which the outcomes of a Bell test on polarization-entangled photons directly choose musical motifs, control digital audio processing, and drive projected visuals. The authors' central claim is that these measurement outcomes form a 'quantum conductor' whose correlations cannot be reproduced by any classical device, because the CHSH value crossed the classical bound of 2 (reaching about 2.45 in the premiere). If correct, this is the first time that genuinely non-classical correlations, not just quantum randomness, have served as the live compositional engine of a concert. The project also makes the degree of entanglement itself an intended musical parameter, with a deliberately classical section standing in audible contrast to the entangled sections.

What carries the argument

The carrying mechanism is the Bell test itself. Polarization-entangled photons in the state (|HH⟩+|VV⟩)/√2 are produced by spontaneous parametric downconversion and sent to two distant measurement stations. Each station uses a motorized half-wave plate to choose one of two polarization settings and records a ±1 outcome; clicks are time-tagged to identify coincident photon pairs. The four setting combinations yield the CHSH expression S = |E11 + E12 + E21 − E22|, which is at most 2 for any local-hidden-variable theory but can reach 2√2 for entangled photons. A software pipeline converts each run's settings and outcomes into musical and visual commands, and in '8 Rooms' the same outcomes drive

What would settle it

Recompute the CHSH value from the raw time-tagged photon data with a fully characterized coincidence window and known measurement angles; if the resulting S is at or below 2 within stated uncertainties, the performance's data did not exhibit non-classical correlations. Alternatively, a forced-choice listening test in which audiences cannot distinguish the S>2 section from the S<2 section better than chance would falsify the audibility claim.

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Extended reading notes

Core claim

The central claim of the paper is that a live performance can be driven by the non-classical correlations of entangled photons, rather than merely by quantum randomness or human choice. On stage, a source produces polarization-entangled photon pairs; each photon is sent to a separate measurement station, Alice and Bob, who randomly choose between two polarization settings. The correlated ±1 outcomes are mapped in real time to musical motifs for the performers, to audio effects, and to visuals. Because the measured correlations violate the CHSH inequality (S ≈ 2.45 in the premiere), the authors argue that the musical instructions sent to the two performers exhibit correlations that no classic

Load-bearing premise

The non-classical claim rests on the reported S ≈ 2.45 being a statistically valid CHSH estimate, but the coincidence-window calibration, measurement angles, count rates, and raw data are not reported; an additional unverified premise is that listeners can perceptually distinguish the quantum and classical sections.

Editorial extensions

If this is right

  • If the reported Bell value of about 2.45 is genuine, this is the first live performance whose musical material depends on correlations that cannot be produced classically.
  • The Bell value itself becomes a compositional knob: shifting between the entangled regime (S > 2) and the classical regime (S < 2) produces a deliberately audible and visible difference.
  • The real-time data pipeline built for the stage—time-tagged photon clicks, OSC messaging, and LAN-synchronized scores—can be reused by other quantum-art performances.
  • The 2D random walk in '8 Rooms' shows how Bell outputs can shape musical form, alternating between correlated bias and near-uniform chance.

Reading between the lines

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

  • The same outcome-to-art mapping could be adapted to other entangled systems (trapped ions, superconducting qubits) or to multipartite Bell tests, since the musical layer only needs raw settings and ±1 outcomes.
  • Because the paper reports no controlled listening test, the claim that the quantum/classical shift is audible remains an empirical question; a forced-choice audience experiment could settle it.
  • The stage performance does not need to be loophole-free to be artistically meaningful: the audience experiences the data stream directly, and the non-classical interpretation rests on the standard, separately established Bell-experiment results.
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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

4 major / 5 minor

Summary. The paper reports on 'The Sound of Entanglement', a live musical and visual performance driven by real-time measurements of polarization-entangled photon pairs in a Bell test. It describes two compositions, BruQner and 8 Rooms, the experimental setup, the software pipeline that maps Alice/Bob outcomes to musical motifs and a 2D random walk, and the visual design. The supplementary material contains a self-contained derivation of the CHSH inequality and a description of the 2D random walk. The central claim is that the performance is driven by non-classical correlations that 'no classical computer or human could generate', supported by the statement in Section IV.A that the premiere obtained an S-value of approximately 2.45.

Significance. If the reported S-value is statistically validated, this would be the first documented live performance driven by real-time Bell-test violations. The artistic integration of a working Bell setup as a 'quantum conductor' is novel and potentially inspiring for the quantum-art community. The paper also provides a clear derivation of the CHSH inequality and a transparent description of the outcome-to-music mapping, which helps reproducibility of the artistic concept. However, the scientific evidence for the non-classical character of the correlations is currently anecdotal, and the audibility claim is unsupported.

major comments (4)
  1. [Section IV.A] The reported S-value of 'approximately 2.45' is given without any statistical support. No error bar, confidence interval, number of coincidence counts, count rate, dark-count rate, or coincidence-to-accidental ratio is provided. The 1 ns coincidence window introduced in Section III.A is not justified by the timing jitter or detector specifications. Without these data, the reader cannot assess whether the measured S is significantly above 2. This is the sole quantitative evidence for the paper's central claim that the performance uses non-classical correlations. Please provide raw data, at least the standard error, and the accidental-coincidence subtraction procedure.
  2. [Section III.C and IV.A] The claim that a shift from S>2 to S<2 is 'genuinely audible' is not supported by any evidence. The paper describes the composer's intention and states that the classically correlated section used 'a more arbitrary sequence', but no controlled listening test, blind evaluation, or quantitative analysis of the musical output is presented. If audibility is claimed as a result, it needs a dedicated study or at least a reproducible demonstration; otherwise, it should be framed as a subjective artistic goal.
  3. [Section III.B] The statement that the setup sends 'entangled instructions' such that the music follows correlations 'that no classical computer or human could generate' is stronger than what the experiment supports. As the paper itself acknowledges, the experiment does not close any loopholes; a local hidden variable model could in principle reproduce the observed data. The claim should be qualified, e.g., 'under the assumption that the observed correlations are not attributable to loopholes'.
  4. [Section III.A and IV.A] The paper does not specify the measurement angles (a1, a2, b1, b2) used to achieve S≈2.45, nor the settings used for the 'classical' section with S<2. These settings are essential for reproducing the CHSH value and for understanding the mapping. Please list the angles used in the performance, or provide a reference to a calibration dataset.
minor comments (5)
  1. [Abstract] 'quantumsensors' and 'networksandcomputers' are missing spaces; typesetting issue.
  2. [Section II] Typo: 'millenium' should be 'millennium'.
  3. [Section III.A] The measurement basis is said to be 'randomly selected' by motorized half-wave plates, but the source of randomness is not described. For the Bell-test interpretation, it would be helpful to state whether a quantum random number generator or a pseudo-random sequence was used, and whether the settings were space-like separated.
  4. [Section IV.B] The term '2-dimensional quantum random walk' is misleading, since the walk described is a classical stochastic process whose transition probabilities are influenced by quantum measurement outcomes. Consider renaming it to 'random walk driven by quantum measurement outcomes'.
  5. [Supplementary Material, Fig. 12 caption] Grammar: 'the length of the arrows are proportional' should be 'the lengths of the arrows are proportional'; 'amount of times' should be 'number of times'.

Circularity Check

0 steps flagged · score 2.0 of 10

No circularity: central claims rest on measured CHSH S-value and standard derivations; self-citations are non-load-bearing.

full rationale

The paper's derivation chain is not circular. The physical premise—that the entangled photon source violates the CHSH inequality—is supported by a directly measured S-value of approximately 2.45 (Section IV.A), not by a quantity fitted to the musical output. The CHSH inequality is derived self-containedly in the Supplementary Material from the algebraic identity A1(B1+B2)+A2(B1−B2)=±2, and the 2D random walk mapping is an explicit compositional construction whose bias is a consequence of the measured correlations, not an input to the S-value. The mapping from Bell outcomes to music and visuals (Section III.C) does not feed back into the Bell test; no equation defines the S-value in terms of musical features. The self-citations (Kofler & Zeilinger 2010; Giustina et al. 2015, which includes a co-author) are used only as background context for intrinsic randomness and for the existence of loophole-free Bell tests; they are external, published results and are not load-bearing for the paper's central artistic claim. The acknowledged open loopholes and the absence of error bars for S≈2.45 are experimental-statistical concerns, not circularity. Likewise, the supplement's claim that S=0 makes all random-walk directions equally likely is mathematically questionable but is not a circular step. The paper is self-contained against external benchmarks: the Bell value is measured, and the artistic mapping is a creative choice rather than a hidden re-derivation of the input.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central claim rests on standard Bell-test assumptions plus a hand-designed mapping whose perceptual effect is unverified. No new physical entities are introduced; the 'quantum conductor' is a metaphorical framing of the Bell setup as an automated musical director.

free parameters (4)
  • Bell measurement basis angles (a1, a2, b1, b2) = not reported
    The choice of polarization settings determines the attainable S value. The paper states two pre-programmed directions per party but does not give the angles, count rates, or calibration, so the reported S about 2.45 cannot be independently reconstructed.
  • Coincidence window = 1 ns
    Used to identify photons from the same pair. The paper provides no coincidence-to-accidental ratio or timing jitter analysis, so the validity of the estimated correlations is assumed.
  • Outcome-to-motif mapping = 28 motif sets, 4+4 motifs, variable tempos
    The composition mapping from Bell outcomes to musical motifs and echo patterns is hand-chosen by the composer. No design rules or perceptual validation are given. This mapping is central to the claim that entanglement is audible.
  • Random-walk step and room parameters = 8 directions; room boundaries and durations preset
    In 8 Rooms, the mapping from settings and outcomes to steps, and the room geometry, are compositional choices that determine the musical form. No quantitative analysis of the resulting bias is provided.
assumptions (5)
  • standard math CHSH inequality: local hidden variable models satisfy S <= 2
    Derived in the Supplementary Material; this is a textbook result and is used as the classical bound.
  • standard math Quantum mechanics predicts S = 2*sqrt(2) for maximally entangled two-photon states with optimal settings
    Referenced in Section III.B and the supplement; used as the theoretical benchmark for the entangled regime.
  • domain assumption The photon pairs produced by SPDC are described by the Phi+ Bell state
    Section III.A states this is engineered by choosing the right input polarization, but no fidelity or visibility measurement is reported.
  • domain assumption Loophole-free Bell tests license the statement that nature violates local realism, so the open loopholes in this performance do not undermine the non-classical interpretation
    Section III.B explicitly invokes refs 19-21 to support this; it is an external, non-circular assumption.
  • ad hoc to paper The designed mapping makes the difference between S > 2 and S < 2 sections perceptually audible
    Stated in Section III.C as the goal and as an achieved claim, but no listening test, audio analysis, or statistical comparison is presented.

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Cite this review

Pith. "Pith review of The Sound of Entanglement." pith.science (2026). https://pith.science/paper/662QIX2W

@misc{pith2026250908892,
  author       = {Pith},
  title        = {Pith review of: The Sound of Entanglement},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/662QIX2W}},
  note         = {Machine review of arXiv:2509.08892}
}
read the original abstract

The advent of quantum physics has revolutionized our understanding of the universe, replacing the deterministic framework of classical physics with a paradigm dominated by intrinsic randomness and quantum correlations. This shift has not only enabled groundbreaking technologies, such as quantum sensors, networks and computers, but has also unlocked entirely new possibilities for artistic expressions. In this paper, we explore the intersection of quantum mechanics and art, focusing on the use of quantum entanglement and inherent randomness as creative tools. Specifically, we present The Sound of Entanglement, a live musical performance driven by real-time measurements of entangled photons in a Bell test. By integrating the measured quantum correlations as a central compositional element and synchronizing live visuals with experimental data, the performance offers a unique and unrepeatable audiovisual experience that relies on quantum correlations which cannot be produced by any classical device. Through this fusion of science and art, we aim to provide a deeper appreciation of quantum phenomena while expanding the boundaries of creative expression.

Figures

Figures reproduced from arXiv: 2509.08892 by the authors.

Figure 1
Figure 1. Sound of Entanglement world premiere. A picture taken during the world premiere of The Sound of Entangle￾ment in the New Cathedral in Linz, Austria, as a part of the opening act for the Ars Electronica Festival on Septem￾ber 4th, 2024, which coincided with Anton Bruckner’s 200th birthday. The Bell setup, as an integral part to our perfor￾mance, sits in the middle of the church and is highlighted by some additional l… view at source ↗
Figure 2
Figure 2. Sketch layout of the project components. The experimental Bell setup in the middle, where data detection happens live on-stage. This quantum data of non-classical correlations is then transferred to the projector, here on the left, and to the musicians, symbolized through three instruments. The communication happens via laptops and LAN connections (excluded in the sketch). tion of a photon may be in a superposition … view at source ↗
Figure 3
Figure 3. Bell setup. A laser source (white box) produces entangled photon pairs that are guided through mirrors and half-wave plates to two detectors: Alice (red) and Bob (blue). Both choose between two measurement settings – a1, a2 for Alice, b1, b2 for Bob – and upon measuring their photon get an output with the value +1 or −1. olate Bell’s inequality – into a musical and visual per￾formance. For a more detailed explanatio… view at source ↗
Figures from the paper (8 more)
Figure 4
Figure 4. Figure 4: Software pipeline for the performance. Detection events from the entangled-photon experiment are streamed to Experiment Control, which forwards them through a Communication Interface via OSC over Ethernet to both the Composition Generation patch and the Visual Genera￾t…
Figure 5
Figure 5. Figure 5: One possible set of 8 motifs. In BruQner, the quantum conductor chooses musical motifs for both musi￾cians to play. Every time a measurement is taken, the re￾sults corresponding to one of the four musical motifs is then sent live to the musicians and queued-up for them…
Figure 7
Figure 7. Figure 7: Types of echoes created as a basis for one rooms musical rhythm. Alice and Bob do have four sets of click patterns each which the experiment chooses, similar to the musical motifs that have been prepared for BruQner. They are designed in a way that every combination of…
Figure 8
Figure 8. Figure 8: Example set of room compositions. In 8 Rooms every room has a different musical theme. Here we show an example layout of rooms for the performance. The random walk chooses the successor to room 1 by hitting an adjacent boundary, which leads to rooms 2, 3, 5, or 7. When…
Figure 9
Figure 9. Figure 9: Visual performance for 8 Rooms. Each panel shows two overlaid audio spectra derived from contact mi￾crophones fixed to the motorized rotation stages, while color, line thickness and camera motion are modulated in real time by the corresponding photon-measurement result…
Figure 10
Figure 10. Figure 10: 8 Rooms live performance. A picture taken during the 8 Rooms performance at the Science Diplomacy Summit 2025 in Washington DC, USA. The Bell setup sits front and center on stage, with the musicians to its side. The visuals for each room are shown on the large screen …
Figure 11
Figure 11. Figure 11: Scheme of the CHSH setup. carried out have definitive values, regardless of what is happening elsewhere at the same time. In theories with local hidden variables, for a single pair of photons all 4 results – A1, A2, B1, B2 – have definite values at the same time. Sinc…
Figure 12
Figure 12. Figure 12: A skewed quantum random walk with Bell value 2 √ 2. This figure shows the projections from a1, b1, a2, b2 onto a two dimensional grid. Measurements yielding +1 are translated to arrows going from the center of the grid either right or top, while measurements yielding …

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