Interfacing a quantum dot with a spontaneous parametric down-conversion source

Huber, Tobias; Prilmüller, Maximilian; Sehner, Michael; Solomon, Glenn S.; Predojević, Ana; Weihs, Gregor

doi:10.1088/2058-9565/aa7b65

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…This work shows the reliability and versatility of the implemented platform, merging and interfacing technologically different solutions in the same network. The use of separable measurements allows interfacing sources of different natures, avoiding the drawbacks of optical Bell-state measurements requiring also the synchronization of single-photon emission [96]. Furthermore, our experiment has employed both free-space and fiber links in an urban environment, whose combined adoption represents a crucial requirement towards large scale networks.…”

Section: Discussionmentioning

confidence: 99%

Quantum violation of local causality in an urban network using hybrid photonic technologies

Carvacho¹,

Roccia²,

Valeri³

et al. 2023

Quantum Computing, Communication, and Simulation III

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Quantum networks play a crucial role in distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Fundamentally, networks with independent sources allow for new forms of nonlocality, beyond the paradigmatic Bell's theorem. Here we implement the simplest of such networks-the bilocality scenario-in an urban network connecting different buildings with a fully scalable and hybrid approach. Two independent sources using different technologies-a quantum dot and a nonlinear crystal-are used to share a photonic entangled state among three nodes connected through a 270 m free-space channel and fiber links. By violating a suitable nonlinear Bell inequality, we demonstrate the nonlocal behavior of the correlations among the nodes of the network. Our results pave the way towards the realization of more complex networks and the implementation of quantum communication protocols in an urban environment, leveraging the capabilities of hybrid photonic technologies.

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Section: Discussionmentioning

confidence: 99%

Quantum violation of local causality in an urban network using hybrid photonic technologies

Carvacho¹,

Roccia²,

Valeri³

et al. 2023

Quantum Computing, Communication, and Simulation III

View full text Add to dashboard Cite

show abstract

“…This work shows the reliability and versatility of the implemented platform, merging and interfacing technologically different solutions in the same network. The use of separable measurements allows interfacing sources of different natures, avoiding the drawbacks of optical Bell-state measurements requiring also the synchronization of the single-photon emission [93]. Furthermore, our experiment has employed both free-space and fiber links in an urban environment, whose combined adoption represent a crucial requirement towards large scale networks.…”

mentioning

confidence: 99%

Quantum violation of local causality in urban network with hybrid photonic technologies

Carvacho¹,

Roccia²,

Valeri³

et al. 2021

Preprint

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Quantum networks play a crucial role for distributed quantum information processing, enabling the establishment of entanglement and quantum communication among distant nodes. Fundamentally, networks with independent sources allow for new forms of nonlocality, beyond the paradigmatic Bell's theorem. Here we implement the simplest of such networks -the bilocality scenario-in an urban network connecting different buildings with a fully scalable and hybrid approach. Two independent sources using different technologies, respectively a quantum dot and a nonlinear crystal, are used to share photonic entangled state among three nodes connected through a 270 m free-space channel and fiber links. By violating a suitable non-linear Bell inequality, we demonstrate the nonlocal behaviour of the correlations among the nodes of the network. Our results pave the way towards the realization of more complex networks and the implementation of quantum communication protocols in an urban environment, leveraging on the capabilities of hybrid photonic technologies.

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“…Here we explore both theoretically and experimentally HOM interference with imperfect single-photon sources. Previously, the impact of multi-photon contributions on HOM interference has been investigated in the limited case where the additional photons are in the same spectral and temporal mode as the predominant ones [20][21][22]. It has been shown that the visibility of HOM interference in this case is given by V HOM = M tot − g (2) (0) [19,23], where M tot is the mean wavepacket overlap of the total input state, i.e.…”

mentioning

confidence: 99%

Hong-Ou-Mandel Interference with Imperfect Single Photon Sources

Ollivier,

Thomas,

Wein

et al. 2020

Preprint

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Hong-Ou-Mandel interference is a cornerstone of optical quantum technologies. We explore both theoretically and experimentally how the nature of unwanted multi-photon components of single photon sources affect the interference visibility. We apply our approach to quantum dot single photon sources in order to access the mean wavepacket overlap of the single-photon componentan important metric to understand the limitations of current sources. We find that the impact of multi-photon events has thus far been underestimated, and that the effect of pure dephasing is even milder than previously expected.

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Interfacing a quantum dot with a spontaneous parametric down-conversion source

Cited by 8 publications

References 29 publications

Quantum violation of local causality in an urban network using hybrid photonic technologies

Quantum violation of local causality in an urban network using hybrid photonic technologies

Quantum violation of local causality in urban network with hybrid photonic technologies

Hong-Ou-Mandel Interference with Imperfect Single Photon Sources

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