Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing

Meyer-Scott, Evan; Prasannan, Nidhin; Dhand, Ish; Eigner, Christof; Quiring, Viktor; Barkhofen, Sonja; Brecht, Benjamin; Plenio, Martin B.; Silberhorn, Christine

doi:10.1103/physrevlett.129.150501

Cited by 31 publications

(16 citation statements)

References 37 publications

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“…Whereas sophisticated forms of multi-photon entanglement have been reported 55 , the associated rates are not well-suited for network considerations. Notably, however, recent advances based on time-multiplexing and feed-forward 56 offer a path to better rates. Moreover, deterministic entanglement swapping with passive linear optics is many times not possible without auxiliary photons 57 and, while probabilistic entanglement swapping, as in our experiment, is possible, it typically comes with success rates rapidly decreasing in the number of qubits 58 .…”

Section: Discussionmentioning

confidence: 99%

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

et al. 2023

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Networks composed of independent sources of entangled particles that connect distant users are a rapidly developing quantum technology and an increasingly promising test-bed for fundamental physics. Here we address the certification of their post-classical properties through demonstrations of full network nonlocality. Full network nonlocality goes beyond standard nonlocality in networks by falsifying any model in which at least one source is classical, even if all the other sources are limited only by the no-signaling principle. We report on the observation of full network nonlocality in a star-shaped network featuring three independent sources of photonic qubits and joint three-qubit entanglement-swapping measurements. Our results demonstrate that experimental observation of full network nonlocality beyond the bilocal scenario is possible with current technology.

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Section: Discussionmentioning

confidence: 99%

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

et al. 2023

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“…Dieser Quantenspeicher verfügt über verschiedene Modi, die dynamisch über ein Feed‐forward‐Signal umgeschaltet werden können. Es gibt den Speichermodus, dem Interferenzmodus und die abschließende Freigabe [2].…”

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Verschränkung wie am Fließband

Barkhofen

Brecht

Silberhorn

2023

Physik in unserer Zeit

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Was Albert Einstein einst „spukhafte Fernwirkung“ nannte, war der Royal Swedish Academy of Sciences den Physiknobelpreis 2022 wert. Durch die Kombination von zeitlichem Multiplexing und kontrollierten Feed‐forward‐Signalen in einem photonischen Quantenspeicher gelingt die Verschränkung sogenannter Greenberger‐Horn‐Zeilinger‐Zustände von immer mehr Quantenteilchen nun schneller und effizienter.

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“…A successful, competing approach to atomic memories uses all-optical setups, namely cavities [29,30] and storage loops [14][15][16][17][31][32][33]. Cavity systems have achieved good performance with narrowband photons, ζ = 25 and R sync = 90 cps [30], but these are internal-source systems.…”

Section: ) For a Comparison Of Different Experiments See Supplemental...mentioning

confidence: 99%

“…Cavity systems have achieved good performance with narrowband photons, ζ = 25 and R sync = 90 cps [30], but these are internal-source systems. Storage loops, which are input-output systems, have reached ζ = 30 and R sync = 450 cps with broadband SPDC photons [16,17,32] but inferior performance with narrowband photons [31]. Notably, interfacing the broadband photons generated from SPDC with atomic ensembles remains an outstanding challenge.…”

Section: ) For a Comparison Of Different Experiments See Supplemental...mentioning

confidence: 99%

Single-photon synchronization with a room-temperature atomic quantum memory

Davidson¹,

Yogev²,

Poem³

et al. 2023

Preprint

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Efficient synchronization of single photons that are compatible with narrowband atomic transitions is an outstanding challenge, which could prove essential for photonic quantum information processing.Here we report on the synchronization of independently-generated single photons using a roomtemperature atomic quantum memory. The photon source and the memory are interconnected by fibers and employ the same ladder-level atomic scheme. We store and retrieve the heralded single photons with end-to-end efficiency of ηe2e = 25% and final anti-bunching of g(2) h = 0.023. Our synchronization process results in over tenfold increase in the photon-pair coincidence rate, reaching a rate of more than 1000 detected synchronized photon pairs per second. The indistinguishability of the synchronized photons is verified by a Hong-Ou-Mandel interference measurement.

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Scalable Generation of Multiphoton Entangled States by Active Feed-Forward and Multiplexing

Cited by 31 publications

References 37 publications

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics

Verschränkung wie am Fließband

Single-photon synchronization with a room-temperature atomic quantum memory

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