Publisher's Note: An artificial Rb atom in a semiconductor with lifetime-limited linewidth [Phys. Rev. B<b>92</b>, 245439 (2015)]

Jahn, Jan-Philipp; Munsch, Mathieu; Béguin, Lucas; Kuhlmann, Andreas V.; Renggli, Martina; Huo, Yongheng; Ding, Fei; Trotta, Rinaldo; Reindl, Marcus; Schmidt, Oliver G.; Rastelli, Armando; Treutlein, Philipp; Warburton, Richard J.

doi:10.1103/physrevb.93.159905

Cited by 2 publications

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“…Obviously, for high values of the pulse area the effect becomes negligible as the carrier-phonon interaction dominates. While the use of an incoherent above-band excitation is not generally required, many groups 24 − 26 have reported that the ensuing charge stabilization dramatically improves the state preparation fidelities when the QDs are driven resonantly. Similarly, in the sample with GaAs/AlGaAs QDs employed here, we always find that the white light leads to an increase of the maximum population probability at the π-pulse with magnitudes that are QD dependent and that range from 10% to 50% (see Figure 1 c).…”

Section: Results and Discussionmentioning

confidence: 99%

Phonon-Assisted Two-Photon Interference from Remote Quantum Emitters

et al. 2017

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Photonic quantum technologies are on the verge of finding applications in everyday life with quantum cryptography and quantum simulators on the horizon. Extensive research has been carried out to identify suitable quantum emitters and single epitaxial quantum dots have emerged as near-optimal sources of bright, on-demand, highly indistinguishable single photons and entangled photon-pairs. In order to build up quantum networks, it is essential to interface remote quantum emitters. However, this is still an outstanding challenge, as the quantum states of dissimilar “artificial atoms” have to be prepared on-demand with high fidelity and the generated photons have to be made indistinguishable in all possible degrees of freedom. Here, we overcome this major obstacle and show an unprecedented two-photon interference (visibility of 51 ± 5%) from remote strain-tunable GaAs quantum dots emitting on-demand photon-pairs. We achieve this result by exploiting for the first time the full potential of a novel phonon-assisted two-photon excitation scheme, which allows for the generation of highly indistinguishable (visibility of 71 ± 9%) entangled photon-pairs (fidelity of 90 ± 2%), enables push-button biexciton state preparation (fidelity of 80 ± 2%) and outperforms conventional resonant two-photon excitation schemes in terms of robustness against environmental decoherence. Our results mark an important milestone for the practical realization of quantum repeaters and complex multiphoton entanglement experiments involving dissimilar artificial atoms.

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Section: Results and Discussionmentioning

confidence: 99%

Phonon-Assisted Two-Photon Interference from Remote Quantum Emitters

et al. 2017

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Quantum dots for photonic quantum information technology

Heindel¹,

Kim²,

Gregersen³

et al. 2023

Adv. Opt. Photon.

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The generation, manipulation, storage, and detection of single photons play a central role in emerging photonic quantum information technology. Individual photons serve as flying qubits and transmit the relevant quantum information at high speed and with low losses, for example between individual nodes of quantum networks. Due to the laws of quantum mechanics, the associated quantum communication is fundamentally tap-proof, which explains the enormous interest in this modern information technology. On the other hand, stationary qubits or photonic states in quantum computers can potentially lead to enormous increases in performance through parallel data processing, to outperform classical computers in specific tasks when quantum advantage is achieved. In this review, we discuss in depth the great potential of semiconductor quantum dots in photonic quantum information technology. In this context, quantum dots form a key resource for the implementation of quantum communication networks and photonic quantum computers, because they can generate single photons on demand. Moreover, these solid-state quantum emitters are compatible with the mature semiconductor technology, so that they can be integrated comparatively easily into nanophotonic structures such as resonators and waveguide systems, which form the basis for quantum light sources and integrated photonic quantum circuits. After a thematic introduction, we present modern numerical methods and theoretical approaches to device design and the physical description of quantum dot devices. We then introduce modern methods and technical solutions for the epitaxial growth and for the deterministic nanoprocessing of quantum devices based on semiconductor quantum dots. Furthermore, we highlight the most promising device concepts for quantum light sources and photonic quantum circuits that include single quantum dots as active elements and discuss applications of these novel devices in photonic quantum information technology. We close with an overview of open issues and an outlook on future developments.

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Publisher's Note: An artificial Rb atom in a semiconductor with lifetime-limited linewidth [Phys. Rev. B92, 245439 (2015)]

Cited by 2 publications

References 0 publications

Phonon-Assisted Two-Photon Interference from Remote Quantum Emitters

Phonon-Assisted Two-Photon Interference from Remote Quantum Emitters

Quantum dots for photonic quantum information technology

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