Armando Rastelli
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View article: Optical and Magnetic Response by Design in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ga</mml:mi><mml:mi>As</mml:mi></mml:mrow></mml:math> Quantum Dots
Optical and Magnetic Response by Design in Quantum Dots Open
Quantum networking technologies use spin qubits and their interface to single photons as core components of a network node. This necessitates the ability to co-design the magnetic- and optical-dipole response of a quantum system—a capabili…
View article: Passive demultiplexed two-photon state generation from a quantum dot
Passive demultiplexed two-photon state generation from a quantum dot Open
High-purity multi-photon states are essential for photonic quantum computing. Among existing platforms, semiconductor quantum dots offer a promising route to scalable and deterministic multi-photon state generation. However, to fully reali…
View article: Keeping the photon in the dark: Enabling quantum dot dark state control by chirped pulses and magnetic fields
Keeping the photon in the dark: Enabling quantum dot dark state control by chirped pulses and magnetic fields Open
Dark excitons in quantum dots are not directly optically accessible, which has limited their use in practical applications. Nevertheless, they offer promising features such as substantially longer lifetimes compared to bright excitons, mak…
View article: Wavevector-resolved polarization entanglement from radiative cascades
Wavevector-resolved polarization entanglement from radiative cascades Open
View article: Towards High-Performance Quantum Light Sources via Optimized Epitaxial Growth
Towards High-Performance Quantum Light Sources via Optimized Epitaxial Growth Open
View article: Deterministic Fabrication of GaAs‐Quantum‐Dot Micropillar Single‐Photon Sources
Deterministic Fabrication of GaAs‐Quantum‐Dot Micropillar Single‐Photon Sources Open
This study investigates the performance of droplet‐etched GaAs quantum dots (QDs) integrated into micropillar structures using a deterministic fabrication technique. A unity QD positioning yield across 74 devices and consistent device perf…
View article: Electric-Field Control of Photon Indistinguishability in Cascaded Decays in Quantum Dots
Electric-Field Control of Photon Indistinguishability in Cascaded Decays in Quantum Dots Open
Photon indistinguishability, entanglement, and antibunching are key ingredients in quantum optics and photonics. Decay cascades in quantum emitters offer a simple method to create entangled-photon-pairs with negligible multipair generation…
View article: Tuning the Coherent Interaction of an Electron Qubit and a Nuclear Magnon
Tuning the Coherent Interaction of an Electron Qubit and a Nuclear Magnon Open
A central spin qubit interacting coherently with an ensemble of proximal spins can be used to engineer entangled collective states or a multiqubit register. Making full use of this many-body platform requires tuning the interaction between…
View article: Optical and magnetic response by design in GaAs quantum dots
Optical and magnetic response by design in GaAs quantum dots Open
Quantum networking technologies use spin qubits and their interface to single photons as core components of a network node. This necessitates the ability to co-design the magnetic- and optical-dipole response of a quantum system. These pro…
View article: Entanglement and purity can help to detect systematic experimental errors
Entanglement and purity can help to detect systematic experimental errors Open
Measurements are central in all quantitative sciences and a fundamental challenge is to make observations without systematic measurement errors. This holds in particular for quantum information processing, where other error sources like no…
View article: Passive Demultiplexed Two-photon State Generation from a Quantum Dot
Passive Demultiplexed Two-photon State Generation from a Quantum Dot Open
High-purity multi-photon states are essential for photonic quantum computing. Among existing platforms, semiconductor quantum dots offer a promising route to scalable and deterministic multi-photon state generation. However, to fully reali…
View article: Storing quantum coherence in a quantum dot nuclear spin ensemble for over 100 milliseconds
Storing quantum coherence in a quantum dot nuclear spin ensemble for over 100 milliseconds Open
States with long coherence are a crucial requirement for qubits and quantum memories. Nuclear spins in epitaxial quantum dots are a great candidate, offering excellent isolation from external environments and on-demand coupling to optical …
View article: Deterministic fabrication of GaAs-quantum-dot micropillar single-photon sources
Deterministic fabrication of GaAs-quantum-dot micropillar single-photon sources Open
This study investigates the performance of droplet-etched GaAs quantum dots (QDs) integrated into micropillar structures using a deterministic fabrication technique. We demonstrate a unity QD positioning yield across 74 devices and consist…
View article: A many-body quantum register for a spin qubit
A many-body quantum register for a spin qubit Open
Quantum networks require quantum nodes with coherent optical interfaces and several stationary qubits. In terms of optical properties, semiconductor quantum dots are highly compelling, but their adoption as quantum nodes has been impaired …
View article: Quantum teleportation with dissimilar quantum dots over a hybrid quantum network
Quantum teleportation with dissimilar quantum dots over a hybrid quantum network Open
Photonic quantum information processing in metropolitan quantum networks lays the foundation for cloud quantum computing [1, 2], secure communication [3, 4], and the realization of a global quantum internet [5, 6]. This paradigm shift requ…
View article: Exploring photon-number-encoded high-dimensional entanglement from a sequentially excited quantum three-level system
Exploring photon-number-encoded high-dimensional entanglement from a sequentially excited quantum three-level system Open
The sequential resonant excitation of a two-level quantum system results in the emission of a state of light showing time-entanglement encoded in the photon-number basis: notions that can be extended to three-level quantum systems as discu…
View article: Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots
Experimental measurement of the reappearance of Rabi rotations in semiconductor quantum dots Open
Phonons in solid-state quantum emitters play a crucial role in their performance as photon sources in quantum technology. For resonant driving, phonons dampen the Rabi oscillations resulting in reduced preparation fidelities. The phonon sp…
View article: Robust Single-Photon Generation for Quantum Information Enabled by Stimulated Adiabatic Rapid Passage
Robust Single-Photon Generation for Quantum Information Enabled by Stimulated Adiabatic Rapid Passage Open
The generation of single photons using solid-state quantum emitters is pivotal for advancing photonic quantum technologies, particularly in quantum communication. As the field continuously advances towards practical use cases and beyond sh…
View article: Wavevector-resolved polarization entanglement from radiative cascades
Wavevector-resolved polarization entanglement from radiative cascades Open
The generation of entangled photons from radiative cascades has enabled milestone experiments in quantum information science with several applications in photonic quantum technologies. Significant efforts are being devoted to pushing the p…
View article: A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot
A source of entangled photons based on a cavity-enhanced and strain-tuned GaAs quantum dot Open
View article: Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System
Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System Open
The sequential resonant excitation of a 2-level quantum system results in the emission of a state of light showing time-entanglement encoded in the photon-number-basis - notions that can be extended to 3-level quantum systems as discussed …
View article: Many-body quantum register for a spin qubit
Many-body quantum register for a spin qubit Open
Quantum networks require quantum nodes with coherent optical interfaces and multiple stationary qubits. In terms of optical properties, semiconductor quantum dots are highly compelling, but their adoption as quantum nodes has been impaired…
View article: Tuning the coherent interaction of an electron qubit and a nuclear magnon
Tuning the coherent interaction of an electron qubit and a nuclear magnon Open
A central spin qubit interacting coherently with an ensemble of proximal spins can be used to engineer entangled collective states or a multi-qubit register. Making full use of this many-body platform requires tuning the interaction betwee…
View article: Is Wave Function Collapse Necessary? Explaining Quantum Nondemolition Measurement of a Spin Qubit within Linear Evolution
Is Wave Function Collapse Necessary? Explaining Quantum Nondemolition Measurement of a Spin Qubit within Linear Evolution Open
The measurement problem dates back to the dawn of quantum mechanics. Here, we measure a quantum dot electron spin qubit through off-resonant coupling with a highly redundant ancilla, consisting of thousands of nuclear spins. Large redundan…
View article: Keeping the photon in the dark: Enabling full quantum dot control by chirped pulses and magnetic fields
Keeping the photon in the dark: Enabling full quantum dot control by chirped pulses and magnetic fields Open
Because dark excitons in quantum dots are not directly optically accessible, so far they have not played a significant role in using quantum dots for photon generation. They possess significantly longer lifetimes than their brighter counte…
View article: Polarized and Unpolarized Emission from a Single Emitter in a Bullseye Resonator
Polarized and Unpolarized Emission from a Single Emitter in a Bullseye Resonator Open
Polarized , and unpolarized emission from a single emitter embedded in a single, cylindrically symmetric device design is presented. The polarization stems from a position offset of the single emitter with respect to the cavity center, whi…
View article: Approaching a fully-polarized state of nuclear spins in a solid
Approaching a fully-polarized state of nuclear spins in a solid Open
View article: Controlling the photon number coherence of solid-state quantum light sources for quantum cryptography
Controlling the photon number coherence of solid-state quantum light sources for quantum cryptography Open
Quantum communication networks rely on quantum cryptographic protocols including quantum key distribution (QKD) based on single photons. A critical element regarding the security of QKD protocols is the photon number coherence (PNC), i.e.,…
View article: Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling
Postfabrication Tuning of Circular Bragg Resonators for Enhanced Emitter-Cavity Coupling Open
Solid-state quantum emitters embedded in circular Bragg resonators are attractive due to their ability to emit quantum light with high brightness and low multiphoton probability. As for any emitter-microcavity system, fabrication imperfect…
View article: Postfabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling
Postfabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling Open
Dataset for "Postfabrication tuning of circular Bragg resonators for enhanced emitter-cavity coupling" ACS Photonics 2024, 11, 2, 596-603https://doi.org/10.1021/…