Limitations on the indistinguishability of photons from remote solid state sources

Kambs, Benjamin; Becher, Christoph

doi:10.1088/1367-2630/aaea99

Cited by 70 publications

(53 citation statements)

References 65 publications

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“…As δt increases, the remote-QD HOM visibility decreases exponentially, a consequence of the reduced overlap of the two wave-functions. This is in excellent agreement with theoretical expectations for exponentiallydecaying wave-packets 33 . Exploiting the exquisite frequency control provided by the electrical gates, we explore also the dependence of the two-photon interference on the frequency detuning ∆ between the two QDs.…”

supporting

confidence: 90%

Quantum Interference of Identical Photons from Remote GaAs Quantum Dots

Zhai,

Nguyen,

Spinnler

et al. 2021

Preprint

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Photonic quantum technology provides a viable route to quantum communication 1,2 , quantum simulation 3 , and quantum information processing 4 . Recent progress has seen the realisation of boson sampling using 20 single-photons 3 and quantum key distribution over hundreds of kilometres 2 . Scaling the complexity requires photonic architectures containing a large number of single photons, multiple photon-sources and photon-counters. Semiconductor quantum dots are bright and fast sources of coherent single-photons [5][6][7][8][9] . For applications, a significant roadblock is the poor quantum coherence upon interfering single photons created by independent quantum dots 10,11 . Here, we demonstrate two-photon interference with near-unity visibility using photons from remote quantum dots. Exploiting the quantum interference, we demonstrate a photonic controlled-not circuit and a high-fidelity entanglement between photons of different origins. Our results provide a long-awaited solution to the challenge of creating coherent single-photons in a scalable way. In the near future, they point to a demonstration of quantum advantage using quantum-dot single photons 8 and an implementation of device-independent quantum key distribution 2 .

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supporting

confidence: 90%

Quantum Interference of Identical Photons from Remote GaAs Quantum Dots

Zhai,

Nguyen,

Spinnler

et al. 2021

Preprint

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“…Such a platform offers high extraction efficiency, significant Purcell enhancement, charge control, the ability for local strain tuning, and the freedom to guide light anywhere on chip to and from randomly positioned QDs [20,21]. However, the generation of high-visibility two-photon interference from remote QDs is a significant challenge to be met in all approaches [60][61][62]. Regardless of the chosen nanophotonics platform, our multispot microscope enables genuine scalability by providing individual excitation and collection to multiplex streams of single photons for optical quantum-information processes.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

et al. 2020

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Solid-state quantum emitters are excellent sources of on-demand indistinguishable or entangled photons and can host long-lived spin memories, crucial resources for photonic quantum-information applications. However, their scalability remains an outstanding challenge. Here, we present a scalable technique to multiplex streams of photons from multiple independent quantum dots, on chip, into a fiber network for use "off chip." Multiplexing is achieved by incorporating a multicore fiber into a confocal microscope and spatially matching the multiple foci, seven in this case, to quantum dots in an array of deterministically positioned nanowires. As a proof-of-principle demonstration, we perform parallel spectroscopy on the nanowire array to identify two nearly identical quantum dots at different positions, which are subsequently tuned into resonance with an external magnetic field. Multiplexing of background-free single photons from these two quantum dots is then achieved. Our approach, applicable to all types of quantum emitters, can readily be integrated into scalable photonic based quantum technologies.

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“…The dependence of r δω on the FSS is ruled by the effect of frequency detuning on the 2-photon interference [77], given that the oscillator strength for the two X transitions remains approximately equal. The specific expression of this dependence is affected by the other mechanisms which are present and reduce the HOM visibility [101]. For example, if we assume that the HOM visibility is mainly limited by pure dephasing, the following analytical form is obtained:…”

Section: Entanglement Teleportation With Real Emittersmentioning

confidence: 99%

Entanglement teleportation with photons from quantum dots: towards a solid-state based quantum network

Rota

Basset

Tedeschi

et al. 2020

IEEE J. Select. Topics Quantum Electron.

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Semiconductor quantum dots are currently emerging as one of the most promising sources of non-classical light on which to base future quantum networks. They can generate single photons as well as pairs of entangled photons with unprecedented brightness, indistinguishability, and degree of entanglement. These features have very recently opened up the possibility to perform advanced quantum optics protocols that were previously inaccessible to single quantum emitters. In this work, we report on two experiments that use the non-local properties of entanglement to teleport quantum states: three-photon state teleportation and four-photon entanglement teleportation. We discuss all the experimental results in light of a theoretical model that we develop to account for the nonidealities of the quantum source. The excellent agreement between theory and experiment enables a deep understanding of how each parameter of the source affects the teleportation fidelities and it pinpoints the requirements needed to overcome the classical limits. Finally, our model suggests how to further improve quantum-dot entangled-photon sources for practical quantum networks.

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Limitations on the indistinguishability of photons from remote solid state sources

Cited by 70 publications

References 65 publications

Quantum Interference of Identical Photons from Remote GaAs Quantum Dots

Quantum Interference of Identical Photons from Remote GaAs Quantum Dots

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

Entanglement teleportation with photons from quantum dots: towards a solid-state based quantum network

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