Pith Number

pith:Q2IB6WMF

pith:2026:Q2IB6WMFHPHGP57TTJNO52RNKK

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Quantum optical synthesis of high-dimensional ultrafast frequency-bin qudits

(2) Advanced ICT Research Institute, 3) ((1) Graduate School of Informatics, (3) Institute for Advanced Science, Communications Technology, Engineering, Hirotaka Terai (2), Hyogo, Japan, Japan), Kali P. Nayak (1), Masahiro Yabuno (2), National Institute of Information, Prasad Koviri (1), Rina Yabumoto (1), Ryosuke Shimizu (1, Shigehito Miki (2), The University of Electro-Communications, Tokyo, Tomoya Okita (1), Yuta Fujihashi (1)

Time-domain Fourier optical synthesis converts broadband entangled photon pairs into discrete high-dimensional frequency-bin qudits with observed Hilbert-space dimensionality of at least 289.

arxiv:2605.14314 v1 · 2026-05-14 · quant-ph · physics.optics

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Claims

C1strongest claim

We observe lower bounds on the frequency-binned Hilbert-space dimensionalities of at least 289, formed by two entangled qudits with dimension 17. Furthermore, we demonstrate quantum nonlocality via frequency correlations in a transmission experiment over a campus-scale two-node fiber network.

C2weakest assumption

That the measured spectral anticorrelations and Schmidt decomposition reflect genuine high-dimensional quantum entanglement rather than being dominated by experimental noise, imperfect frequency filtering, or residual classical correlations.

C3one line summary

Experimental generation of 17-dimensional frequency-bin entangled qudits with verified nonlocality over a campus-scale fiber network using time-domain Fourier synthesis.

References

1 extracted · 1 resolved · 0 Pith anchors

[1] S1) Grice, W. P. & Walmsley, I. A. Spectral information and distinguishability in type-II down-conversion with a broadband pump. Phys. Rev. A 56, 1627-1634 (1997). S2) Christ, A., Laiho, K., Eckstein, 1997

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-17T23:39:09.958226Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

86901f59853bce67f7f39a5aeeea2d5292da336adc70f7b0cdb7e2e7e3c2732f

Aliases

arxiv: 2605.14314 · arxiv_version: 2605.14314v1 · doi: 10.48550/arxiv.2605.14314 · pith_short_12: Q2IB6WMFHPHG · pith_short_16: Q2IB6WMFHPHGP57T · pith_short_8: Q2IB6WMF

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/Q2IB6WMFHPHGP57TTJNO52RNKK \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 86901f59853bce67f7f39a5aeeea2d5292da336adc70f7b0cdb7e2e7e3c2732f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "328706d143c6ded8969ba7f44d1c9c148eef8685bed799fa347a8d9de7340390",
    "cross_cats_sorted": [
      "physics.optics"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-05-14T03:24:08Z",
    "title_canon_sha256": "e00b812c518465d4ee327fac79c0afc2d1f9a5caa6f7abc045439d2314aaaa4a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.14314",
    "kind": "arxiv",
    "version": 1
  }
}