Quantum repeaters based on atomic ensembles and linear optics

Sangouard, Nicolas; Simon, Christoph; de Riedmatten, Hugues; Gisin, Nicolas

doi:10.1103/revmodphys.83.33

Cited by 1,888

The DOI matches its Crossref record; 20 of the 20 references it cites were found in a registry or an index.

Quantum repeaters based on atomic ensembles and linear optics

Sangouard, Nicolas, Simon, Christoph, de Riedmatten, Hugues, Gisin, Nicolas·2011·Reviews of Modern Physics

DOI 10.1103/revmodphys.83.33

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An arbitrary polarization qubit can be optimally cloned using the HOM effect by interfering it on a beam splitter with an ancilla in a maximally mixed polarization state.
“For example, an arbitrary polarization qubit |1 s = α |1 H + β |1 V , where |α| 2 + |β| 2 = 1, can be optimally cloned using the HOM effect by interfering it on a beam splitter with an ancilla that is in a maximally mixed polarization state”
From Two-photon interference: the Hong–Ou–Mandel effect (2021) · cites this paper as [115]
The section on entanglement creation and swapping based on two-photon detections describes HOM interference when photons meet at a beam splitter. It does not say that this effect optimally clones an arbitrary polarization qubit or describe an ancilla in a maximally mixed polarization state. (LLM, conf=0.83)
Experimental — accuracy not yet measured
The use of QEC in place of HEP speeds up the process by avoiding the time delays due to non-adjacent-nodes signalling.
“however, the use of QEC in place of HEP speeds up the process by avoiding the time delays due to non-adjacentnodes signalling [416].”
From Photonic quantum information processing: a review (2019) · cites this paper as [416]
The discussion of entanglement purification in section 1, “Storage Time” (page unavailable), says purification adds complexity and causes a slowdown. It does not say that replacing heralded entanglement purification with quantum error correction speeds up the process, or that the benefit comes from avoiding signalling delays between non-adjacent nodes. (LLM, conf=0.82)
Experimental — accuracy not yet measured
Optimal 1→2 cloning of a qudit can be achieved with a fidelity F_cloning = 1/2 + 1/(d+1).
“Optimal 1 → 2 cloning (i.e. two clones of one original state) of a qudit can be achieved with a fidelity of F cloning = 1 2 + 1 d+1 [114][115][116][117].”
From Two-photon interference: the Hong–Ou–Mandel effect (2021) · cites this paper as [115]

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Authors: Sangouard, N., Simon, C., de Riedmatten, H., & Gisin, N.
Venue: Reviews of Modern Physics
Publisher: American Physical Society (APS)
Published: 2011-03-21
Volume: 83
Issue: 1
Pages: 33-80
ISSN: 0034-6861
1539-0756
DOI: 10.1103/revmodphys.83.33
Cited by: 1,888
References: 20
Language: en
Licence: link.aps.org/licenses/aps-default-license (vor)

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