Pith Number

pith:EIQSPEQ4

pith:2009:EIQSPEQ4OP5MHUHWD7XBKXROWN

not attested not anchored not stored refs pending

Feedback Control Using Only Quantum Back-Action

Kurt Jacobs

arxiv:0904.3745 v1 · 2009-04-24 · 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{EIQSPEQ4OP5MHUHWD7XBKXROWN}

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.

Receipt and verification

First computed	2026-05-18T02:13:57.691592Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

222127921c73fac3d0f61fee155e2eb347ea24d7eeedf7af36f15a541c7a06e5

Aliases

arxiv: 0904.3745 · arxiv_version: 0904.3745v1 · doi: 10.48550/arxiv.0904.3745 · pith_short_12: EIQSPEQ4OP5M · pith_short_16: EIQSPEQ4OP5MHUHW · pith_short_8: EIQSPEQ4

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/EIQSPEQ4OP5MHUHWD7XBKXROWN \
  | 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: 222127921c73fac3d0f61fee155e2eb347ea24d7eeedf7af36f15a541c7a06e5

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "9312136d969e8ecf07c6c26c499d4b7c1665fb34a5f7b970a7b59106de2b19d9",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "quant-ph",
    "submitted_at": "2009-04-24T15:12:17Z",
    "title_canon_sha256": "acb4d6d293363f59b47790400f1b3e3a1e339dc95083b6d55fa65c1104237d42"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0904.3745",
    "kind": "arxiv",
    "version": 1
  }
}