Survival of continuous variable entanglement over long distances

Nocerino, Gaetano; Buono, Daniela; Porzio, Alberto; Solimeno, S.

doi:10.1088/0031-8949/2013/t153/014049

Cited by 11 publications

(9 citation statements)

References 42 publications

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“…" In the lower panel Fig. of 3 we show a zoom of the high absorption region (T < 0.1) to show that, by applying a posteriori criteria, CV entanglement can be set between very low energy states, as also verified in [42]. The plots show a good agreement between the reported data and the theoretical expectation.…”

Section: Fcd Fthsupporting

confidence: 72%

Experimental pre-assessing of two-mode entanglement in Gaussian state mixing

et al. 2017

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We suggest and demonstrate a method to assess entanglement generation schemes based on mixing of Gaussian states at a beam splitter (BS). Our method is based on the fidelity criterion and represents a tool to analyze the effect of losses and noise before the BS in both symmetric and asymmetric channels with and without thermal effects. More generally, our scheme allows one to pre-assess entanglement resources and to optimize the design of BS-based schemes for the generation of continuous variable entanglement.

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Section: Fcd Fthsupporting

confidence: 72%

Experimental pre-assessing of two-mode entanglement in Gaussian state mixing

et al. 2017

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“…in symmetric setting χ 1 = χ 2 = 0.02; in asymmetric setting χ 1 = 0, χ 2 = 0.02). We note a value of χ < 0.02 is consistent with receiver noise in modern detectors [47]. In the first instance we ignore any realistic operational constraints, and probe the evolution of our states under conditions where the initial entanglement of all states is equal.…”

Section: Resultssupporting

confidence: 53%

Entanglement generation via non-Gaussian transfer over atmospheric fading channels

Hosseinidehaj

Malaney

2015

Phys. Rev. A

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Abstract-In this work we probe the usefulness of nonGaussian entangled states as a resource for quantum communication through atmospheric channels. We outline the initial conditions in which non-Gaussian state transfer leads to enhanced entanglement transfer relative to that obtainable via Gaussian state transfer. However, we conclude that in (anticipated) operational scenarios -where most of the non-Gaussian states to be transferred over the air are created just-in-time via photonic subtraction, addition or replacement from incoming Gaussian states -the entanglement-generation rate between stations via non-Gaussian state transfer will be substantially less than that created by direct Gaussian state transfer. The role of post-selection, distillation and quantum memory in altering this conclusion is discussed, and comparison with entanglement rates produced via single-photon technologies is provided. Our results suggest that in the near term entangled Gaussian states, squeezed beyond some modest level, offer the most attractive proposition for the distribution of entanglement through highloss atmospheric channels. The implications of our results for entanglement-based QKD to low-earth orbit are presented.

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“…This does not happen for entanglement witnesses related to the PHS and Duan criteria. 5,6 As for example, at T = 0.01, i.e. 99% of losses, E N (σ) = 0.01 ± 0.02 and E F (σ) = 0.000 ± 0.002; while w P HS = −0.008 ± 0.001 and w DUAN = −0.018 ± 0.001.…”

Section: Resultsmentioning

confidence: 99%

Transmitting continuous variable entangled states over long distances

et al. 2013

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Recently, we experimentally proved that, even in presence of strong decoherence, the bi-partite continuous variable entangled state generated by a sub-threshold type-II optical parametric oscillator (OPO) never disentangles. It keeps breaking the limits for some of the entanglement criteria. In this contribution, we extend our previous analysis by focusing on the behaviour, under decohenrece, of two entanglement measures: Logarithmic Negativity (LN) and Entanglement of Formation (EOF).

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Survival of continuous variable entanglement over long distances

Cited by 11 publications

References 42 publications

Experimental pre-assessing of two-mode entanglement in Gaussian state mixing

Experimental pre-assessing of two-mode entanglement in Gaussian state mixing

Entanglement generation via non-Gaussian transfer over atmospheric fading channels

Transmitting continuous variable entangled states over long distances

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