Strain-Controlled Quantum Dot Fine Structure for Entangled Photon Generation at 1550 nm

Lettner, Thomas; Gyger, Samuel; Zeuner, Katharina D.; Schweickert, Lucas; Steinhauer, Stephan; Hedlund, Carl Reuterskiöld; Stroj, Sandra; Rastelli, Armando; Hammar, Mattias; Trotta, Rinaldo; Jöns, Klaus D.; Zwiller, Val

doi:10.1021/acs.nanolett.1c04024

Cited by 29 publications

(13 citation statements)

References 34 publications

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“…The experimentally recorded separation efficiency and cross talk are 77.3% and −6.43 dB, which are still comparable to the recently reported DOE-based OAM sorters. The ultracompact size makes our OAM sorter compatible with the fiber system, and it therefore shall be able to accelerate the advance of high-capacity optical communications and quantum communications. , …”

Section: Discussionmentioning

confidence: 99%

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Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip

et al. 2022

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On-chip integrated orbital angular momentum (OAM) sorting is of great importance in tackling the severe challenge of exponential growth in data traffic. Despite the continuous success, current demultiplexing techniques either scarify efficiency dramatically or lose the compactness of a system. Here we experimentally demonstrate an ultracompact OAM sorter using TiO 2 metasurfaces integrated onto a complementary metaloxide-semiconductor (CMOS) camera. By utilizing the propagation phases, we transfer the unitary transformation theory in bulky systems into two TiO 2 metasurfaces, responsible for the functions of log-polar transformation and fan-out beam copying and focusing as well as the functions of phase correction and Fourier transform. The flatform metasurface doublet enables one to integrate the OAM sorter onto a camera chip. Consequently, OAM beams with topological charges of m = −3 to 3 were separated by a CMOS camera with an average crosstalk of −6.43 dB. This approach shall shed light on next-generation OAM modes processing.

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Section: Discussionmentioning

confidence: 99%

“…The ultracompact size makes our OAM sorter compatible with the fiber system, and it therefore shall be able to accelerate the advance of high-capacity optical communications and quantum communications. 39,40 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: ■ Conclusionmentioning

confidence: 99%

Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip

et al. 2022

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“…Internal conversion efficiencies of 5%–15% have been demonstrated in the silicon waveguides [303,304] and 12%–60% in micro-resonators [305–307] , where the limitation is mainly the phase mismatch. An alternative approach is to develop high-quality quantum dots directly at telecom wavelengths [69,107,172,283,308–310] . In this approach, losses due to wavelength conversion can be circumvented.…”

Section: Quantum Dots For Quantum Networkmentioning

confidence: 99%

Epitaxial quantum dots: a semiconductor launchpad for photonic quantum technologies

2022

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Epitaxial quantum dots formed by III-V compound semiconductors are excellent sources of nonclassical photons, creating single photons and entangled multi-photon states on demand. Their semiconductor nature allows for a straightforward combination with mature integrated photonic technologies, leading to novel functional devices at the single-photon level. Integrating a quantum dot into a carefully engineered photonic cavity enables control of the radiative decay rate using the Purcell effect and the realization of photon-photon nonlinear gates. In this review, we introduce the basis of epitaxial quantum dots and discuss their applications as non-classical light sources. We highlight two interfaces-one between flying photons and the quantum-dot dipole, and the other between the photons and the spin. We summarize the recent development of integrated photonics and reconfigurable devices that have been combined with quantum dots or are suitable for hybrid integration. Finally, we provide an outlook of employing quantum-dot platforms for practical applications in large-scale quantum computation and the quantum Internet.

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“…With the source randomness, self-assembled QDs encounter two technological difficulties when applied in scalable networking applications. First, energy splitting between the two bright exciton states, the so-called fine-structure splitting (FSS, s ), , is ubiquitous for the majority of QDs. − Such FSS is detrimental to entanglement formation as it causes an evolution of the biphoton state from the ideal entangled state to only classically correlated state (see Figure a). Second, the source randomness leads to a large inhomogeneous broadening for the transition energies of QDs .…”

Section: Introductionmentioning

confidence: 99%

Strain Tuning Self-Assembled Quantum Dots for Energy-Tunable Entangled-Photon Sources Using a Photolithographically Fabricated Microelectromechanical System

Wang

Wei

et al. 2022

ACS Photonics

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Self-assembled quantum dots (QDs) offer versatile sources of quantum light for photonic quantum technologies thanks to their atomic-like discrete energy levels for deterministic generation of single photons. Though, the unavoidable inhomogeneous broadening and the ubiquitous presence of the fine structure splitting (FSS) of the exciton states hamper their use as high-fidelity entangled-photon sources (EPSs) with well-defined energies, core elements in scalable networking quantum applications. To overcome these challenges, in this work, we propose and demonstrate a photolithographically fabricated microelectromechanical system (MEMS) to dynamically control the optical properties of QDs. The device features two orthogonal and independent uniaxial stresses that can tune the exciton energy and the FSS simultaneously, enabling demonstration of energy-tunable EPSs based on self-assembled QDs. The device can be processed by only employing standard photolithography techniques, which alleviates the use of sophisticated device design and fabrications, thus providing a viable route toward the realization of entanglement swapping with all-solid-state quantum emitters.

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Strain-Controlled Quantum Dot Fine Structure for Entangled Photon Generation at 1550 nm

Cited by 29 publications

References 34 publications

Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip

Ultracompact Orbital Angular Momentum Sorter on a CMOS Chip

Epitaxial quantum dots: a semiconductor launchpad for photonic quantum technologies

Strain Tuning Self-Assembled Quantum Dots for Energy-Tunable Entangled-Photon Sources Using a Photolithographically Fabricated Microelectromechanical System

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