Maximally entangled and gigahertz-clocked on-demand photon pair source

Hopfmann, Caspar; Nie, Weijie; Sharma, Nand Lal; Weigelt, Carmen; Ding, Fei; Schmidt, Oliver G.

doi:10.1103/physrevb.103.075413

Cited by 25 publications

(11 citation statements)

References 37 publications

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“…The "on"-fractions are 46.9(3) ± 0.42 % and 51.1(2) ± 0.83% for device A and B (see supplementary), respectively [43]. Blinking [44,45] is detrimental for the efficiency of quantum interference [46] (in our case estimated to 48.9(4)%) and therefore also entanglement swapping.…”

Section: Network-relevant Device Characteristicsmentioning

confidence: 62%

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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Section: Network-relevant Device Characteristicsmentioning

confidence: 62%

Limits for quantum networks with semiconductor entangled photon sources

Yang,

Zopf,

et al. 2021

Preprint

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“…In conclusion the presented comprehensive investigations, methods and findings enable the directed usage of excited state resonances to deterministically prepare fundamental spin states in GaAs quantum dots. These fundamental abilities will pave the way to use these quantum dots in a large variety of future quantum optical experiments and applications, such as QD based quantum memories [17,38,39], quantum entanglement repeaters [9,10], photon graph [6] and cluster states [7] as well as more efficient entangled photon pair sources [14,20].…”

Section: Discussionmentioning

confidence: 99%

“…While nuclear polarization and spin echo techniques may extend the coherence time of spin qubits significantly [18,19], the achievable values in commonly employed InGaAs QDs are still limited by the presence of high spin (+9/2) 115 In and 113 In isotopes. In recent years droplet etched GaAs QDs have been established as potent sources of entangled photon pairs [9,10,14,20], featuring high quality on-demand entangled photon pair generation at GHz clock rates suitable for entanglement swapping operations. Due to the lack of In, these quantum dots are also * c.hopfmann@ifw-dresden.de attractive candidates for extended spin qubit coherence -which has not been investigated so far.…”

Section: Introductionmentioning

confidence: 99%

Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation

Hopfmann,

Sharma,

Nie

et al. 2020

Preprint

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“…A way to resonantly excite the biexciton state under compliance with the electric-dipole selection rules consists in using a two-photon absorption process. [37,[78][79][80] The laser energy is set between the exciton and biexciton emission energy and, in QDs with a sufficiently large and positive biexciton binding energy, it cannot directly populate the exciton state with experimentally achieved repetition rates up to 1 GHz [81] . Additionally, the probability of populating other states or charge configurations is also drastically reduced.…”

Section: Excitation Methodsmentioning

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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Maximally entangled and gigahertz-clocked on-demand photon pair source

Cited by 25 publications

References 37 publications

Limits for quantum networks with semiconductor entangled photon sources

Limits for quantum networks with semiconductor entangled photon sources

Deterministic preparation of spin qubits in droplet etched GaAs quantum dots using quasi-resonant excitation

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

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