Bright Electrically Controllable Quantum‐Dot‐Molecule Devices Fabricated by In Situ Electron‐Beam Lithography

Schall, Johannes; Deconinck, Marielle; Bart, Nikolai; Florian, Matthias; Helversen, Martin von; Dangel, Christian; Schmidt, R.; Bremer, Lucas; Bopp, Frederik; Hüllen, Isabell; Gies, Christopher; Reuter, D.; Wieck, A. D.; Rodt, Sven; Finley, Jonathan J.; Jahnke, F.; Ludwig, Arne; Reitzenstein, Stephan

doi:10.1002/qute.202100002

Cited by 16 publications

(10 citation statements)

References 38 publications

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“…We here use the aforementioned advantages of semiconductor quantum photonic technology to demonstrate controlled coherent coupling between excitonic transitions hosted by a pair of InAs QDs separated by ≈8 nm, forming a QDM. ,,, The system is doped so that, apart from spin degeneracy, the ground state manifold of the QDM consists of two states, with a hole in one or the other QD, as schematically depicted in Figure a. As seen in the sketch in Figure b, from the two coupled charged three-particle complexes (trions) that can be excited optically, one is entirely located in one of the QDs, while the other spans both dots.…”

Section: Device and Experimental Methodsmentioning

confidence: 99%

“…To achieve suitably high optical in- and out-coupling efficiency for the FWM signal, a circular Bragg grating is deterministically positioned around the QDM in the center of the quantum device. For details on the sample design and processing we refer to ref . The charge-doped layers surrounding the QDM sheet provide a p-i-n diode structure allowing voltage control.…”

Section: Device and Experimental Methodsmentioning

confidence: 99%

“…Fortunately, the epitaxial growth and nanoprocessing of QD-based quantum devices has been improved close to perfection, and individual nanostructures can nowadays be embedded deterministically into advanced nanophotonic devices with high photon extraction efficiency to improve the application potential and to enable experiments relying on high single-photon flux. , On the other hand, the development of heterodyning and interferometric techniques in FWM spectroscopy made it possible to apply this method to single quantum emitters and to detect and characterize the coupling between individual transitions in various systems. − …”

Section: Introductionmentioning

confidence: 99%

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Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy

et al. 2023

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Semiconductor quantum dot molecules are considered promising candidates for quantum technological applications due to their wide tunability of optical properties and coverage of different energy scales associated with charge and spin physics. While previous works have studied the tunnel-coupling of the different excitonic charge complexes shared by the two quantum dots by conventional optical spectroscopy, we here report on the first demonstration of a coherently controlled interdot tunnel-coupling focusing on the quantum coherence of the optically active trion transitions. We employ ultrafast four-wave mixing spectroscopy to resonantly generate a quantum coherence in one trion complex, transfer it to and probe it in another trion configuration. With the help of theoretical modeling on different levels of complexity, we give an instructive explanation of the underlying coupling mechanism and dynamical processes.

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Section: Device and Experimental Methodsmentioning

confidence: 99%

Section: Device and Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy

et al. 2023

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“…Then by reducing the temperature, this equilibrium state will roughly coincide with the ground state of the atomic systems and the local reservoir. Laser drives can be used to generate effective initial conditions from a given input data set, ensuring that the system acts predictably [13,30,37]. In order to effectively deploy our QPRC approach, we need to identify a large open quantum system model that can be sampled effectively.…”

Section: Quantum Physical Reservoir Systemmentioning

confidence: 99%

Quantum Reservoir Computing Implementations for Classical and Quantum Problems

Burgess¹,

Florescu²

2022

Preprint

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In this article we employ a model open quantum system consisting of two-level atomic systems coupled to Lorentzian photonic cavities, as an instantiation of a quantum physical reservoir computer. We then deployed the quantum reservoir computing approach to an archetypal machine learning problem of image recognition. We contrast the effectiveness of the quantum physical reservoir computer against a conventional approach using neural network of the similar architecture with the quantum physical reservoir computer layer removed. Remarkably, as the data set size is increased the quantum physical reservoir computer quickly starts out perform the conventional neural network. Furthermore, quantum physical reservoir computer provides superior effectiveness against number of training epochs at a set data set size and outperformed the neural network approach at every epoch number sampled. Finally, we have deployed the quantum physical reservoir computer approach to explore the quantum problem associated with the dynamics of open quantum systems in which an atomic system ensemble interacts with a structured photonic reservoir associated with a photonic band gap material. Our results demonstrate that the quantum physical reservoir computer is equally effective in generating useful representations for quantum problems, even with limited training data size.

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“…In order to achieve the controllable growth of QD, many methods have been tried to accomplish this goal [12][13][14][15][16][17]. Compared with above these technologies, droplet epitaxy(DE) method has become one of the current mainstream technologies because it is not limited by the lattice mismatch between substrate material and epitaxial deposition material [18].…”

Section: Introductionmentioning

confidence: 99%

Controlled Growth Mechanism of Ring-like In(Ga)As Quantum Dot Pairs on GaAs Ring-Ring-Disk Nanostructures Templates

Qizhi

Zhou

Guo

et al. 2022

Mater. Res. Express

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The ring-like In(Ga)As quantum dot pairs (QDPs) is prepared on GaAs ring-ring-disk (R-R-D) nanostructures template by droplet epitaxy (DE) method. The surface morphology of GaAs samples are characterized with Scanning Tunneling Microscope (STM), and studying local controlled growth mechanism of quantum dots (QDs) on GaAs R-R-D nanostructures. STM images show that In(Ga)As QDPs self-assembled a kind of complicated structure with one quantum dot (QD) pair in the center of nanostructures, other QDPs appearing both double rings and disk areas of original GaAs R-R-D nanostructures distributed like a exquisite ring. These In(Ga)As QDPs are uniformly arranged along the [11(-)0] direction of GaAs(001) surface. Combining Stranski-Krastanov (S-K) growth mode and the tensile effect of strain field in the [11(-)0] direction on sample surface, the nucleation position and distribution shape of ring-like In(Ga)As QDPs is locally controllable. It is found that high uniformly QDPs can be locally controlled by the original GaAs R-R-D nanostructures templates. These results can provide certain guiding significance for the controllable growth of QD by DE method.

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Bright Electrically Controllable Quantum‐Dot‐Molecule Devices Fabricated by In Situ Electron‐Beam Lithography

Cited by 16 publications

References 38 publications

Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy

Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy

Quantum Reservoir Computing Implementations for Classical and Quantum Problems

Controlled Growth Mechanism of Ring-like In(Ga)As Quantum Dot Pairs on GaAs Ring-Ring-Disk Nanostructures Templates

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