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Cited by 3Quantum Information and CryptographyQuantum optics and atomic interactionsQuantum Mechanics and Applications

Efficient generation of entangled multiphoton graph states from a single atom

Open access
Thomas, Philip, Ruscio, Leonardo, Morin, Olivier, Rempe, Gerhard·2022·Nature
DOI 10.1038/s41586-022-04987-5PMC PMC9402438
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Abstract

The central technological appeal of quantum science resides in exploiting quantum effects, such as entanglement, for a variety of applications, including computing, communication and sensing 1 . The overarching challenge in these fields is to address, control and protect systems of many qubits against decoherence 2 . Against this backdrop, optical photons, naturally robust and easy to manipulate, represent ideal qubit carriers. However, the most successful technique so far for creating photonic entanglement 3 is inherently probabilistic and, therefore, subject to severe scalability limitations. Here we report the implementation of a deterministic protocol 4–6 for the creation of photonic entanglement with a single memory atom in a cavity 7 . We interleave controlled single-photon emissions with tailored atomic qubit rotations to efficiently grow Greenberger–Horne–Zeilinger (GHZ) states 8 of up to 14 photons and linear cluster states 9 of up to 12 photons with a fidelity lower bounded by 76(6)% and 56(4)%, respectively. Thanks to a source-to-detection efficiency of 43.18(7)% per photon, we measure these large states about once every minute, which is orders of magnitude faster than in any previous experiment 3,10–13 . In the future, this rate could be increased even further, the scheme could be extended to two atoms in a cavity 14,15 or several sources could be quantum mechanically coupled 16 , to generate higher-dimensional cluster states 17 . Overcoming the limitations encountered by probabilistic schemes for photonic entanglement generation, our results may offer a way towards scalable measurement-based quantum computation 18,19 and communication 20,21 .

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  • The linear cross-entropy benchmarking fidelity F_XEB was measured on H2 for classically verifiable random circuits of depth 14, averaged over ten circuits at each fixed N.

    “To match the parameters in Ref. [60], we explore random circuits of depth 14 and average the resulting F XEB over ten circuits at each fixed N, combining the uncertainties on each measurement of F XEB by inversevariance weighting.The measured results on H2 are displayed in Fig. 8.”

    From A Race-Track Trapped-Ion Quantum Processor (2023) · cites this paper as [60]

    The GHZ states section describes fidelity measurements for a 14-photon entangled state, not random circuits of depth 14. The Methods section defines that fidelity from photon-state populations and coherences; the cited paper does not report F_XEB measurements on H2 or averages over ten circuits. The citing sentence describes its own measurements, so those results should not be attributed to this source. (LLM, conf=0.88)

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  • The RCS circuits are structured as if the qubits tile a two-dimensional grid with nearest-neighbor interactions, but this constraint is only imposed for fair comparison with prior art and is not a hardware constraint of H2.

    “We structure our circuits as if the qubits involved tile a two-dimensional grid with nearest-neighbor interactions [60], although we emphasize that this constraint is only imposed for fair comparison with prior art and is not a hardware constraint of H2.”

    From A Race-Track Trapped-Ion Quantum Processor (2023) · cites this paper as [60]

    The Main section describes a proposed two-dimensional fabric of photonic cluster states, not RCS circuits arranged on a two-dimensional nearest-neighbor grid. Searches for RCS circuits and nearest-neighbor grid interactions found no passage addressing the point attached to [60]. The statement about fair comparison and H2 follows the citation and appears to be the citing authors’ own qualification. (LLM, conf=0.76)

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Research works printed but not linked: 33

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Cited by

Sorted by citations

Authors
Thomas, P., Ruscio, L., Morin, O., & Rempe, G.
Affiliations
Max Planck Institute of Quantum Optics (DE)
Corresponding author
Thomas, Philip
ORCID
Venue
Nature
Publisher
Springer Science and Business Media LLC
Published
2022-08-24
Volume
608
Issue
7924
Pages
677-681
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
DOI
10.1038/s41586-022-04987-5
PMC
PMC9402438
OpenAlex
W4281683375
Cited by
3
References
4
Citations by year
2026: 1 · 2023: 1 · 2022: 1
FWCI
0.16
Type
journal article
Language
en
Open access
Licence
Locations
  • Nature (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • arXiv (Cornell University)
Funders
  • European Commission (HORIZON2020, 820445)
  • Deutsche Forschungsgemeinschaft (EXC 2111, 820445, 390814868)
  • Bundesministerium für Bildung und Forschung (390814868, 16KISQ019)
  • Max-Planck-Gesellschaft
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
Keywords
multi-photon entanglement, graph states, GHZ states, linear cluster states, deterministic entanglement generation, single-photon emission, measurement-based quantum computation, quantum communication

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