Nanowire quantum dots tuned to atomic resonances

Abstract

Quantum dots tuned to atomic resonances represent an emerging field of hybrid quantum systems where the advantages of quantum dots and natural atoms can be combined. Embedding quantum dots in nanowires boosts these systems with a set of powerful possibilities, such as precise positioning of the emitters, excellent photon extraction efficiency and direct electrical contacting of quantum dots. Notably, nanowire structures can be grown on silicon substrates, allowing for a straightforward integration with silicon-based photonic devices. In this work we show controlled growth of nanowire-quantum-dot structures on silicon, frequency tuned to atomic transitions. We grow GaAs quantum dots in AlGaAs nanowires with a nearly pure crystal structure and excellent optical properties. We precisely control the dimensions of quantum dots and their position inside nanowires, and demonstrate that the emission wavelength can be engineered over the range of at least $30nm$ around $765nm$. By applying an external magnetic field we are able to fine tune the emission frequency of our nanowire quantum dots to the $D_2$ transition of ${}^{87}$Rb. We use the Rb transitions to precisely measure the actual spectral linewidth of the photons emitted from a nanowire quantum dot to be $9.4\pm 0.7\mu eV$, under non-resonant excitation. Our work brings highly-desirable functionalities to quantum technologies, enabling, for instance, a realization of a quantum network, based on an arbitrary number of nanowire single-photon sources, all operating at the same frequency of an atomic transition.

arXiv commentmain text (20 pages, 3 figures) plus supplementary information, Nano Letters (2018)

References in corpus (20)

• Near optimal single photon sources in the solid state
• Photon antibunching in the fluorescence of individual color centers in diamond
• Bright single-photon sources in bottom-up tailored nanowires
• Deterministic Generation of a Cluster State of Entangled Photons
• Single quantum dot nanowire LEDs
• On-demand generation of background--free single photons from a solid-state source
• Highly indistinguishable and strongly entangled photons from symmetric GaAs quantum dots
• Observation of strongly entangled photon pairs from a nanowire quantum dot
• On-Chip Single-Photon Sifter
• The photonic trumpet: An efficient, broadband interface between a solid-state quantum emitter and a Gaussian beam
• Electrical control over single hole spins in nanowire quantum dots
• Overcoming power broadening of the quantum dot emission in a pure wurtzite nanowire
• Bright nanoscale source of deterministic entangled photon pairs violating Bell's inequality
• Polarization entangled photons from quantum dots embedded in nanowires
• Direct photonic coupling of a semiconductor quantum dot and a trapped ion
• An artificial Rb atom in a semiconductor with lifetime-limited linewidth
• Optical Study of GaAs quantum dots embedded into AlGaAs nanowires
• Spectroscopy of the D1-transition of cesium by dressed-state resonance fluorescence from a single (In,Ga)As/GaAs quantum dot
• Zinc-blende and wurtzite GaAs quantum dots in nanowires studied using hydrostatic pressure
• An artificial atom locked to natural atoms

Cited by in corpus (2)

• Single photon emitters in thin GaAsN nanowire tubes grown on Si
• Defect-Free Axially-Stacked GaAs/GaAsP Nanowire Quantum Dots with Strong Carrier Confinement