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Entanglement Negativity in Noisy Quantum Volume Sampling — arXiv:2608.13654

Source: arXiv (en)
Original: https://arxiv.org/abs/2608.13654
License (as archived): CC0-1.0
Archived: 2026-10-19T04:09:38.243Z
SHA-256 of the archived text: d6141a995a7aee6ca890e423b58a061d8150cbaae2c2accfb07e748464fd9ec1
Stable URL of this page: https://metraipolis.com/documento/dc_b89c5e585c19

How to cite

Entanglement Negativity in Noisy Quantum Volume Sampling — arXiv:2608.13654 — arXiv (en), https://arxiv.org/abs/2608.13654 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_b89c5e585c19 (Metraipolis archive dc_b89c5e585c19, sha256 d6141a995a7aee6ca890e423b58a061d8150cbaae2c2accfb07e748464fd9ec1)

BibTeX

@misc{dcb89c5e585c19,
  title = {Entanglement Negativity in Noisy Quantum Volume Sampling — arXiv:2608.13654},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2608.13654},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_b89c5e585c19; sha256 d6141a995a7aee6ca890e423b58a061d8150cbaae2c2accfb07e748464fd9ec1},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2608.13654. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The Quantum Volume protocol uses scrambling random circuits to benchmark NISQ computers. Quantum Volume is generally well-regarded as a benchmark for small, noisy, quantum computers because it requires the quantum computer to implement many non-local entangling gates within a square-shaped circuit, which incentivizes high qubit count, long qubit coherence times, and low error rates on all hardware gates. Quantum Volume circuits inherently produce high-entanglement states that are fragile to errors and decoherence. The Quantum Volume benchmark measures an observable called heavy-output-probability (HOP), where an HOP of $0.5$ corresponds to complete loss of coherence, and in the limit of system size an HOP $\approx 0.84$ for a fully coherent quantum processor. Here, we numerically study the tradeoff between depolarizing noise, entanglement as quantified by the bipartite negativity measure, and HOP in quantum volume circuits. Our results contextualize prior small scale quantum volume demonstrations on quantum computers and highlight that under depolarizing noise, due to finite system size effects heavy output probabilities can be greater than $0.5$ while the bipartite negativity entanglement has been destroyed. This implies, although improbable, that a NISQ computer could pass the Quantum Volume benchmark test threshold of $2/3$ while the underlying quantum computation has no global entanglement -- albeit only for small $n$.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-08-17 in quant-ph).
Categorie arXiv: Quantum Physics (quant-ph).
Pagina del lavoro: https://arxiv.org/abs/2608.13654 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-19T04:01:17.360Z dalla pagina https://arxiv.org/catchup/quant-ph/2026-08-17?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).