Pith Number

pith:SXDKL5WF

pith:2026:SXDKL5WF3ALYPJ233MSAGQP4Y2

not attested not anchored not stored refs pending

Finite-size general security for relativistic phase shift keying via variable-length quantum key distribution

Carlos Pascual-Garc\'ia

Variable-length Rényi entropy accumulation and conic optimization remove repetition-rate limits from general security proofs for differential phase shift keying.

arxiv:2605.06249 v2 · 2026-05-07 · quant-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{SXDKL5WF3ALYPJ233MSAGQP4Y2}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

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

Our approach achieves secret key rates with 10^5 signals beyond 12 dB, constituting a robust proof of the experimental implementability of industrial-grade DPSK.

C2weakest assumption

The variable-length general security techniques based on Rényi leftover hashing together with conic optimization methods can be applied to DPSK to remove repetition rate constraints and costly estimators without introducing new unaccounted assumptions or limitations.

C3one line summary

Finite-size general security for DPSK QKD is achieved with positive key rates for 10^5 signals beyond 12 dB loss via variable-length entropy accumulation and conic optimization.

Receipt and verification

First computed	2026-07-01T01:17:51.603754Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

95c6a5f6c5d81787a75bdb240341fcc69b0ec555e42e6c564d88f4732d9e0748

Aliases

arxiv: 2605.06249 · arxiv_version: 2605.06249v2 · doi: 10.48550/arxiv.2605.06249 · pith_short_12: SXDKL5WF3ALY · pith_short_16: SXDKL5WF3ALYPJ23 · pith_short_8: SXDKL5WF

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/SXDKL5WF3ALYPJ233MSAGQP4Y2 \
  | 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: 95c6a5f6c5d81787a75bdb240341fcc69b0ec555e42e6c564d88f4732d9e0748

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "af20e228b8da73798c2deaa2c14d7358b98cdb798919702759269db28ce206a2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2026-05-07T13:27:24Z",
    "title_canon_sha256": "45276f9ef24ce27eb70a3fb419bcee3b18d83db1e14ba3889bdb6363c977e3a7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.06249",
    "kind": "arxiv",
    "version": 2
  }
}