Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

Schimpf, Christian; Reindl, Marcus; Basset, Francesco Basso; Jöns, Klaus D.; Trotta, Rinaldo; Rastelli, Armando

doi:10.1063/5.0038729

Cited by 64 publications

(33 citation statements)

References 88 publications

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“…[112] Selective Purcell enhancement together with mild frequency filtering could alleviate this hurdle, as suggested in a recent theoretical study. [178] The aforementioned experiments, quantum teleportation and entanglement swapping with entangled photons from QDs, were both conducted using the same source, which for some reallife applications in communication, namely distant quantum repeaters, is no option. In a quantum network the goal is to generate entanglement between two distant quantum repeaters, so performing entanglement swapping between photon pairs from two different QDs.…”

Section: Discussionmentioning

confidence: 99%

Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Neuwirth

Basset

Rota

et al. 2021

Mater. Quantum. Technol.

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The realization of a functional quantum repeater is one of the major research goals in long-distance quantum communication. Among the different approaches that are being followed, the one relying on quantum memories interfaced with deterministic quantum emitters is considered as one of the most promising solutions. In this work, we focus on the hardware to implement memory-based quantum-repeater schemes that rely on semiconductor quantum dots for the generation of polarization entangled photons. Going through the most relevant figures of merit related to efficiency of the photon source, we select significant developments in fabrication, processing and tuning techniques aimed at combining high degree of entanglement with on-demand pair generation, with a special focus on the progress achieved in the representative case of the GaAs system. We proceed to offer a perspective on integration with quantum memories, both highlighting preliminary works on natural-artificial atomic interfaces and commenting a wide choice of currently available and potentially viable memory solutions in terms of wavelength, bandwidth and noise-requirements. To complete the overview, we also present recent implementations of entanglement-based quantum communication protocols with quantum dots and highlight the next challenges ahead for the implementation of practical quantum networks.

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Section: Discussionmentioning

confidence: 99%

Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Neuwirth

Basset

Rota

et al. 2021

Mater. Quantum. Technol.

Self Cite

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“…A shortening of XX lifetime, e.g. by the Purcell effect, is therefore beneficial for addressing both discussed points that limit the indistinguishability simultaneously [27,28,48].…”

Section: Network-relevant Device Characteristicsmentioning

confidence: 99%

“…Photon states generated by swapping entanglement of photon pairs emitted from a single QD have been shown to violate Bells inequality [25]. The individual properties of QDs that impact the success of entanglement swapping schemes have been well understood [26][27][28]. However, in the real-world application of distributed devices, it is impossible to choose the best possible values of each parameter simultaneously, since each parameter shows a statistical distribution in each device.…”

Section: Introductionmentioning

confidence: 99%

Limits for quantum networks with semiconductor entangled photon sources

Yang,

Zopf,

et al. 2021

Preprint

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Semiconductor quantum dots are promising constituents for future quantum communication. Although deterministic, fast, efficient, coherent, and pure emission of entangled photons has been realized, implementing a practical quantum network remains outstanding. Here we explore the limits for sources of polarizationentangled photons from the commonly used biexciton-exciton cascade. We stress the necessity of tuning the exciton fine structure, and explain why the often observed time evolution of photonic entanglement in quantum dots is not applicable for large quantum networks. The consequences of device fabrication, dynamic tuning techniques and statistical effects for practical network applications are investigated. We identify the critical device parameters and present a numerical model for benchmarking the device scalability in order to bring the realization of distributed semiconductor-based quantum networks one step closer to reality.

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“…Indistinguishable photons are indispensable resources for photonic quantum information processing [1] and underlie several key quantum technologies including linear optical quantum computing [2], remote quantum-state teleportation [3], and quantum-repeater-enabled largescale quantum network [4]. Various optical processes or single-photon emitters have been explored to generate these identical photons, such as non-linear downconversion process [5], single atoms [6] or ions [7], semiconductor quantum dots [8], and solid-state quantum emitters [9]. The latter stands out for the spin-tagged photonic interface [10], mature nanostructure fabrications [11], and the potential to scale up with the quantum photonic integrated circuits [12,13].…”

mentioning

confidence: 99%

Quantum interference of resonance fluorescence from Germanium-vacancy color centers in diamond

Chen¹,

Froech²,

Ru³

et al. 2022

Preprint

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Resonance fluorescence from a quantum emitter is an ideal source to extract indistinguishable photons. By using the cross polarization to suppress the laser scattering, we observed resonance fluorescence from GeV color centers in diamond at cryogenic temperature. The Fourier-transformlimited linewidth emission with T2/2T1 ∼ 0.86 allows for two-photon interference based on single GeV color center. Under pulsed excitation, the 24 ns separated photons exhibit a Hong-Ou-Mandel visibility of 0.604 ± 0.022, while the continuous-wave excitation leads to a coalescence time window of 1.05 radiative lifetime. Together with single-shot readout of spin states, it paves the way towards building a quantum network with GeV color centers in diamond.

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Quantum dots as potential sources of strongly entangled photons: Perspectives and challenges for applications in quantum networks

Abstract: On-demand generation of background-free single photons from a solid-state source Applied Physics Letters 112, 093106 (2018);

Cited by 64 publications

References 88 publications

Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Limits for quantum networks with semiconductor entangled photon sources

Quantum interference of resonance fluorescence from Germanium-vacancy color centers in diamond

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