Historical experiment archive · 20 August 2026

IBM hardware,
recorded honestly.

Two archived QBeacon capability results, presented with their numerical outputs, evidence paths, and the assumptions that limit what can be concluded.

ibm_marrakesh · CHSH Bell pair

S = 2.7504

1.42 × 10−46Reported p-value
142 bitsEntropy · i.i.d. model
Re-verifiablePublished outcomes

The verifier re-derives the CHSH statistic, Merkle root, challenge, and output from the archived outcomes. Because both qubits were on one chip, this is not a spacelike-separated or loophole-free Bell test.

Archived CVQC/Mahadev-labelled experiment

S = 2.8914

7.17 × 10−67Reported p-value
485 bitsEntropy · i.i.d. model
LWEStated assumption

The archived snapshot labels this run CVQC/Mahadev. That label and its CHSH statistic do not by themselves establish implementation of the complete Mahadev protocol. The transcript, verifier, key construction, and assumptions must be assessed together.

Download and check

The archive exposes the signed pulse ledger, public key, standalone verifier, and a manifest containing hashes for those files. The manifest identifies the protocol as qbeacon/v3 and describes the archive claim as a signed, hash-chained ledger.

Historical experiments are not the current live source. The live beacon identifies its source on each pulse; the website must not infer quantum provenance from output statistics.