Crux of Using the Cascaded Emission of a Three-Level Quantum Ladder System to Generate Indistinguishable Photons

Schöll, Eva; Schweickert, Lucas; Hanschke, Lukas; Zeuner, Katharina D.; Sbresny, Friedrich; Lettner, Thomas; Trivedi, Rahul; Reindl, Marcus; Silva, Saimon Filipe Covre da; Trotta, Rinaldo; Finley, Jonathan J.; Vučković, Jelena; Müller, Kai; Rastelli, Armando; Zwiller, Val; Jöns, Klaus D.

doi:10.1103/physrevlett.125.233605

Cited by 56 publications

(51 citation statements)

References 49 publications

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“…This figure is lower than the value of approximately 0.65 commonly reported for GaAs QDs with similar characteristics 16 . While the main reason for below-unity visibility is arguably the time correlation between photons emitted in a cascaded process [33][34][35] , in this case a contribution from environmental field fluctuations is also probable, given the notable level of spectral diffusion in the time-integrated spectrum. Instead, we can safely assume no major reduction comes from the multi-photon emission of the source, because of the low values of the second-order autocorrelation function at zero-time delay g 2 ð Þ X ð0Þ ¼ 0:011ð1Þ and g 2 ð Þ XX ð0Þ ¼ 0:020ð1Þ.…”

Section: Resultsmentioning

confidence: 99%

“…As previously mentioned, the main limiting factor for photon indistinguishability is arguably the time correlation between photons emitted in a cascaded process 33,34 . From the point of view of the X photons, that is tracing out the information on the XX photons, this could be more intuitively seen-with some simplification 35 -as an effective time jittering due to the fact that a random time passes before the system decays from the XX to the X state. Now, the introduction of the etalon filter also has an impact on the wave packet of the emitted photons.…”

Section: Resultsmentioning

confidence: 99%

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Quantum teleportation with imperfect quantum dots

et al. 2021

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Efficient all-photonic quantum teleportation requires fast and deterministic sources of highly indistinguishable and entangled photons. Solid-state-based quantum emitters—notably semiconductor quantum dots—are a promising candidate for the role. However, despite the remarkable progress in nanofabrication, proof-of-concept demonstrations of quantum teleportation have highlighted that imperfections of the emitter still place a major roadblock in the way of applications. Here, rather than focusing on source optimization strategies, we deal with imperfections and study different teleportation protocols with the goal of identifying the one with maximal teleportation fidelity. Using a quantum dot with sub-par values of entanglement and photon indistinguishability, we show that the average teleportation fidelity can be raised from below the classical limit to 0.842(14), adopting a polarization-selective Bell state measurement and moderate spectral filtering. Our results, which are backed by a theoretical model that quantitatively explains the experimental findings, loosen the very stringent requirements set on the ideal entangled-photon source and highlight that imperfect quantum dots can still have a say in teleportation-based quantum communication architectures.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Quantum teleportation with imperfect quantum dots

et al. 2021

Self Cite

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“…In this regard, In recent years, significant progress has been achieved in the field of solid-state with three-level QD and photonic-crystal cavity [101][102][103][104]. Meanwhile, a substantial number of three-level QDs have been put forward which received considerable attention [105][106][107][108][109].…”

Section: Discussion On Experimental Feasibilitymentioning

confidence: 99%

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

Yousefi,

Mortezapour,

Naeimi

et al. 2022

Preprint

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A comparative study of a qutrit (three-level atomic system) coupled to a classical field in a typical Markovian reservoir (free space) and in a photonic band-gap (PBG) crystal is carried out. The aim of the study is to assess the collective impact of structured environment and classical control of the system on the dynamics of quantum coherence, non-Markovianity, and estimation of parameters which are initially encoded in the atomic state. We show that the constructive interplay of PBG material as a medium and classical driving field as a part of system results in a significant enhancement of all the quantum traits of interest, compared to the case when the driven qutrit is in a Markovian environment. Our results supply insights for preserving and enhancing quantum features in qutrit systems which are promising alternative candidates to be used in quantum processors instead of qubits.

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“…The recent interest in GaAs/AlGaAs QDs can be attributed to research of the biexcitonexciton radiative cascade which can generate polarization-entangled photons. Recent work [100] has revealed that the time jitter of the cascade limits photon indistinguishability to M = 66%, unless the ratio of the biexciton lifetime to the exciton lifetime is made very small through cavity engineering. This, in turn, limits the entanglement generation fidelity to (1 + M )/2 = 0.83 per Bell-state measurement.…”

Section: Methodsmentioning

confidence: 99%

Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots

Sharman

Asadi

Wein

et al. 2021

Quantum

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Inspired by recent developments in the control and manipulation of quantum dot nuclear spins, which allow for the transfer of an electron spin state to the surrounding nuclear-spin ensemble for storage, we propose a quantum repeater scheme that combines individual quantum dot electron spins and nuclear-spin ensembles, which serve as spin-photon interfaces and quantum memories respectively. We consider the use of low-strain quantum dots embedded in high-cooperativity optical microcavities. Quantum dot nuclear-spin ensembles allow for the long-term storage of entangled states, and heralded entanglement swapping is performed using cavity-assisted gates. We highlight the advances in quantum dot technologies required to realize our quantum repeater scheme which promises the establishment of high-fidelity entanglement over long distances with a distribution rate exceeding that of the direct transmission of photons.

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Crux of Using the Cascaded Emission of a Three-Level Quantum Ladder System to Generate Indistinguishable Photons

Cited by 56 publications

References 49 publications

Quantum teleportation with imperfect quantum dots

Quantum teleportation with imperfect quantum dots

Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal

Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots

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