Pith Number

pith:EKP7BA2O

pith:2026:EKP7BA2OKAL2LP5TASHDCBYWT2

not attested not anchored not stored refs resolved

Distribution of GHz sequential Time-bin Entanglement in a Metropolitan Fiber Network

Alessandro Trenti, Hannes H\"ubel, Martin Achleitner, Philip Walther

Sequential time-bin entangled photon pairs reach 93% visibility after traveling 30 km through a real metropolitan fiber network.

arxiv:2605.13359 v1 · 2026-05-13 · quant-ph

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\usepackage{pith}
\pithnumber{EKP7BA2OKAL2LP5TASHDCBYWT2}

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Record completeness

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The entangled photons are then sent over an about 30km long (9.5dB loss) fiber link within the Vienna fiber network, showing high degree of distributed entanglement with a measured 93% quantum visibility.

C2weakest assumption

That sequential time-bin encoding ensures high-fidelity distribution robust against random polarisation fluctuations in optical fibers and that 93% visibility suffices for practical QKD protocols in metropolitan settings.

C3one line summary

GHz-rate time-bin entangled photons were distributed over 30 km of metropolitan fiber with 93% visibility using standard components.

References

21 extracted · 21 resolved · 1 Pith anchors

[1] Quantum cryptography without bell’s theorem, 1992

[2] Quantum cryptogra- phy: Public key distribution and coin tossing 2014 · doi:10.1016/j.tcs.2014.05.025

[3] Tailoring photonic entanglement in high-dimensional hilbert spaces, 2004 · doi:10.1103/physreva.69.050304

[4] Time-bin entanglement at telecom wavelengths from a hybrid photonic integrated circuit, 2024 · doi:10.1038/s41598-024-60758-4

[5] Anwar , author C 2021 · doi:10.1063/5.0023103

Receipt and verification

First computed	2026-05-18T02:44:48.173337Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

229ff0834e5017a5bfb3048e3107169e851927c9c1b32abdeccc46a4d95e274f

Aliases

arxiv: 2605.13359 · arxiv_version: 2605.13359v1 · doi: 10.48550/arxiv.2605.13359 · pith_short_12: EKP7BA2OKAL2 · pith_short_16: EKP7BA2OKAL2LP5T · pith_short_8: EKP7BA2O

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/EKP7BA2OKAL2LP5TASHDCBYWT2 \
  | 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: 229ff0834e5017a5bfb3048e3107169e851927c9c1b32abdeccc46a4d95e274f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "1b4b119be92828dd603aa387c3ac8e88e0bbdd90f540177f1f98f5bdaac499e1",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-05-13T11:20:00Z",
    "title_canon_sha256": "8fe82b0f84f75ee1d1697d22787544d05a4644c766511229663e1612297f7d99"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13359",
    "kind": "arxiv",
    "version": 1
  }
}