{"paper":{"title":"Characterizing quantum synchronization in the van der Pol oscillator via tomogram and photon correlation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"In a driven quantum van der Pol oscillator, the nonclassical area from tomograms and zero-delay photon correlations both mark the synchronization region.","cross_cats":[],"primary_cat":"quant-ph","authors_text":"Kingshuk Adhikary, K. M. Athira, M. Rohith","submitted_at":"2025-12-24T16:40:16Z","abstract_excerpt":"Scalable methods for detecting and quantifying the nonclassical nature of a quantum state in noisy environments are challenging due to a complex relationship between noise and quantum coherence. In particular, identifying experimentally accessible signatures of synchronization in such regimes remains an open problem. By leveraging promising experimental implementation, we underpin what possible direct measures of nonclassicality are available. This work outlines accessing quantum synchronization (QS) in the steady state of a driven quantum van der Pol oscillator (vdPo) using two distinct figur"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Within a well-defined parameter regime of drive strength and detuning, both δ and g^(2)(0) exhibit pronounced signatures of synchronization that complements the phase coherence between the drive and the vdPo.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The analytical expression for the steady-state density matrix remains valid for arbitrary drive strengths and that the nonclassical area δ extracted from the tomogram directly quantifies nonclassicality without requiring full state reconstruction.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Nonclassical area δ from the tomogram and g^(2)(0) serve as direct experimental signatures of quantum synchronization in the driven van der Pol oscillator.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"In a driven quantum van der Pol oscillator, the nonclassical area from tomograms and zero-delay photon correlations both mark the synchronization region.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"bb8360da24d4878a452602de23658a8fcd4af1dd12b0abd8b19666aebc4ffb89"},"source":{"id":"2512.21272","kind":"arxiv","version":2},"verdict":{"id":"abb88339-cb06-42a2-90b2-c0e0abd86365","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-16T19:45:00.720716Z","strongest_claim":"Within a well-defined parameter regime of drive strength and detuning, both δ and g^(2)(0) exhibit pronounced signatures of synchronization that complements the phase coherence between the drive and the vdPo.","one_line_summary":"Nonclassical area δ from the tomogram and g^(2)(0) serve as direct experimental signatures of quantum synchronization in the driven van der Pol oscillator.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The analytical expression for the steady-state density matrix remains valid for arbitrary drive strengths and that the nonclassical area δ extracted from the tomogram directly quantifies nonclassicality without requiring full state reconstruction.","pith_extraction_headline":"In a driven quantum van der Pol oscillator, the nonclassical area from tomograms and zero-delay photon correlations both mark the synchronization region."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.21272/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":56,"sample":[{"doi":"","year":null,"title":"For quantum state described by the density matrix ρ the tomogram is defined as [37, 49] ω(Xθ, θ) = ⟨Xθ, θ|ρ|Xθ, θ⟩","work_id":"6ba9ad08-1e12-4311-85ad-3095aa6bd5f8","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2022,"title":"of quantum states and their features in the perspective of QS. Figure 3 exhibits the behaviour of the steady-state quantum tomograms 3(a)-3(c) and their corresponding Wigner functions 3(d)-3(f) at var","work_id":"7a4a8b8a-92a9-4123-a2bc-d03437526c07","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2001,"title":"A. Pikovsky, M. Rosenblum, and J. Kurths, Synchronization: A Universal Concept in Nonlinear Sciences , Cambridge Nonlinear Science Series (Cambridge University Press, 2001)","work_id":"ad89d01e-be9c-4471-a726-058ec32fb0f9","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"Strogatz, Sync: The Emerging Science of Spontaneous Order (Penguin Books Limited, 2004)","work_id":"d23cc44a-c4d2-4175-b90c-61bdf80d03a2","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"G. M. Vaidya, S. B. J ¨ager, and A. Shankar, Phys. Rev. A111, 012410 (2025)","work_id":"04e2a58b-1792-4339-9a9b-2201cf902ea6","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":56,"snapshot_sha256":"a3b4e194605747b10cc3e3dbc93de830ffbdc002d823dbb3c003cefb740747ce","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"1f6837c2f968a69dc2ef7c1508e1ece873c0898e866a3f7a265b5d5c027dd037"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}