Efficient single-photon source based on a deterministically fabricated single quantum dot - microstructure with backside gold mirror

Fischbach, Sarah; Kaganskiy, Arsenty; Tauscher, Esra Burcu Yarar; Gericke, Fabian; Thoma, Alexander; Schmidt, R.; Strittmatter, A.; Heindel, Tobias; Rodt, Sven; Reitzenstein, Stephan

doi:10.1063/1.4991389

Cited by 27 publications

(22 citation statements)

References 27 publications

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“…Above we just discussed the coupling with DBRs [77]. The performance can be further increased by the use of an optical antenna [48] or even just a backside gold mirror [78]. There are two distinct coupling regimes, in weak coupling the Purcell effect is seen.…”

Section: Coupling With Cavitiesmentioning

confidence: 99%

“…Deterministic in-situ growth methods allow one to pre-select emitters either in inverted QD chains [87,92] or by optimized droplet-etching [93] within the intended emission band with an accuracy of about 1 meV. Thus, an additional spectral fine-tuning is needed by means of temperature tuning [94], varying electric fields [95] or strain-tuning [78]. Another solution is to scan and register the dot.…”

Section: Deterministic Fabrication Of Spesmentioning

confidence: 99%

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III–V compounds as single photon emitters

Wang¹,

Xu²,

Jiang³

et al. 2019

J. Semicond.

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Single-photon emitters (SPEs) are one of the key components in quantum information applications. The ideal SPEs emit a single photon or a photon-pair on demand, with high purity and distinguishability. SPEs can also be integrated in photonic circuits for scalable quantum communication and quantum computer systems. Quantum dots made from III-V compounds such as InGaAs or GaN have been found to be particularly attractive SPE sources due to their well studied optical performance and state of the art industrial flexibility in fabrication and integration. Here, we review the optical and optoelectronic properties and growth methods of general SPEs. Subsequently, a brief summary of the latest advantages in III-V compound SPEs and the research progress achieved in the past few years will be discussed. We finally describe frontier challenges and conclude with the latest SPE fabrication science and technology that can open new possibilities for quantum information applications.

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Section: Coupling With Cavitiesmentioning

confidence: 99%

Section: Deterministic Fabrication Of Spesmentioning

confidence: 99%

III–V compounds as single photon emitters

Wang¹,

Xu²,

Jiang³

et al. 2019

J. Semicond.

View full text Add to dashboard Cite

show abstract

“…Techniques for characterising components of free-space QKD systems for ground-air communication have been organized and are ready for use. High-quality single-photon sources have been realised and characterised [15,16,19,20]. The free-space-QKD transmitter module (based on passive optical components, such as (non-)polarising beam splitter and waveplates) exploiting polarization as the encoding degree of freedom has been realised and it is under characterisation.…”

Section: Metrology Framework For Quantum Communication Technologiesmentioning

confidence: 99%

“…The aim of MIQC2 project is to ensure that the results achieved [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][23][24][25][26][27][28][29][30] are provided to the stakeholders and enduser community in a timely and appropriate manner. The primary beneficiaries of the outputs of this project will be the QKD community, but the wider community exploiting single-photon states [32] will also derive significant benefits from the methods, devices, calibration facilities and measurement protocols developed.…”

Section: Impact On Standards and Metrology Industrial And Scientificmentioning

confidence: 99%

European coordinated metrological effort for quantum cryptography

Gramegna

Berchera

Kueck

et al. 2018

Quantum Technologies 2018

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Quantum Key Distribution, a fundamental component of quantum secure communication that exploits quantum states and resources for communication protocols, can future-proof the security of digital communications, when if advanced quantum computing systems and mathematical advances render current algorithmic cryptography insecure. A QKD system relies on the integration of quantum physical devices, as quantum sources, quantum channels and quantum detectors, in order to generate a true random (unconditionally secure) cryptographic key between two remote parties connected through a quantum channel. The gap between QKD implemented with ideal and real devices can be exploited to attack real systems, unless appropriate countermeasures are implemented. Characterization of real devices and countermeasure is necessary to guarantee security. Free-space QKD systems can provide secure communication to remote parties of the globe, while QKD systems based on entanglement are intrinsically less vulnerable to attack. Metrology to characterize the optical components of these systems is required. Actually, the "Optical metrology for quantum-enhanced secure telecommunication" Project (MIQC2) is steering the metrological effort for Quantum Cryptography in the European region in order to accelerate the development and commercial uptake of Quantum Key Distribution (QKD) technologies. Aim of the project is the development of traceable measurement techniques, apparatus, and protocols that will underpin the characterisation and validation of the performance and quantum-safe security of such systems, essential steps towards standardization and certification of practical implementations of quantum-based technologies.

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“…Our work thus constitutes an important step toward scalable implementations of quantum information schemes exploiting the DE spin-qubit, such as photonic cluster state generation. 21 Employing further technological improvements, such as a backside gold mirror 35 and integrated micro-objectives, 36 we expect to achieve photon extraction efficiencies of up to 80% in future experiments. Exploiting the DE spin-qubit in deterministic devices supplied with electrical contacts 37 could lead to significantly improved entanglement fidelities compared to protocols based on all-optical pulse sequences.…”

Section: -6mentioning

confidence: 99%

Accessing the dark exciton spin in deterministic quantum-dot microlenses

et al. 2017

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The dark exciton state in semiconductor quantum dots constitutes a long-lived solid-state qubit which has the potential to play an important role in implementations of solid-state based quantum information architectures. In this work, we exploit deterministically fabricated QD microlenses with enhanced photon extraction, to optically prepare and readout the dark exciton spin and observe its coherent precession. The optical access to the dark exciton is provided via spin-blockaded metastable biexciton states acting as heralding state, which are identified deploying polarization-sensitive spectroscopy as well as time-resolved photon cross-correlation experiments. Our experiments reveal a spin-precession period of the dark exciton of $(0.82\pm0.01)\,$ns corresponding to a fine-structure splitting of $(5.0\pm0.7)\,\mu$eV between its eigenstates $\left|\uparrow\Uparrow\pm\downarrow\Downarrow\right\rangle$. By exploiting microlenses deterministically fabricated above pre-selected QDs, our work demonstrates the possibility to scale up implementations of quantum information processing schemes using the QD-confined dark exciton spin qubit, such as the generation of photonic cluster states or the realization of a solid-state-based quantum memory.Comment: 5 pages, 3 figure

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Efficient single-photon source based on a deterministically fabricated single quantum dot - microstructure with backside gold mirror

Cited by 27 publications

References 27 publications

III–V compounds as single photon emitters

III–V compounds as single photon emitters

European coordinated metrological effort for quantum cryptography

Accessing the dark exciton spin in deterministic quantum-dot microlenses

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