@article{Kagan2020,
title = {Colloidal Quantum Dots as Platforms for Quantum Information Science},
author = {Cherie R. Kagan and Lee C. Bassett and Christopher B. Murray and Sarah M. Thompson},
url = {https://pubs.acs.org/doi/10.1021/acs.chemrev.0c00831},
doi = {10.1021/acs.chemrev.0c00831},
year = {2020},
date = {2020-12-29},
journal = {Chemical Reviews},
abstract = {Colloidal quantum dots (QDs) are nanoscale semiconductor crystals with surface ligands that enable their dispersion in solvents. Quantum confinement effects facilitate wave function engineering to sculpt the spatial distribution of charge and spin states and thus the energy and dynamics of QD optical transitions. Colloidal QDs can be integrated in devices using solution-based assembly methods to position single QDs and to create ordered QD arrays. Here, we describe the synthesis, assembly, and photophysical properties of colloidal QDs that have captured scientific imagination and have been harnessed in optical applications. We focus especially on the current understanding of their quantum coherent effects and opportunities to exploit QDs as platforms for quantum information science. Freedom in QD design to isolate and control the quantum mechanical properties of charge, spin, and light presents various approaches to create systems with robust, addressable quantum states. We consider the attributes of QDs for optically addressable qubits in emerging quantum computation, sensing, simulation, and communication technologies, e.g., as robust sources of indistinguishable, single photons that can be integrated into photonic structures to amplify, direct, and tune their emission or as hosts for isolated, coherent spin states that can be coupled to light or to other spins in QD arrays.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Hopper2019,
title = {Real-Time Charge Initialization of Diamond Nitrogen-Vacancy Centers for Enhanced Spin Readout},
author = {D A Hopper and J D Lauigan and T -Y Huang and L C Bassett},
url = {https://arxiv.org/abs/1907.08741
https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.13.024016
https://medium.com/penn-engineering/penn-engineers-ensure-quantum-experiments-get-off-to-the-right-start-bbe6f3382cb},
year = {2020},
date = {2020-02-07},
journal = {Phys. Rev. Applied},
volume = {13},
pages = {024016},
abstract = {Selected as an Editor's Suggestion.

A common impediment to qubit performance is imperfect state initialization. In the case of the diamond nitrogen-vacancy (NV) center, the initialization fidelity is limited by fluctuations in the defect's charge state during optical pumping. Here, we use real-time control to deterministically initialize the NV center's charge state at room temperature. We demonstrate a maximum charge initialization fidelity of 99.4±0.1% and present a quantitative model of the initialization process that allows for systems-level optimization of the spin-readout signal-to-noise ratio. Even accounting for the overhead associated with the initialization sequence, increasing the charge initialization fidelity from the steady-state value of 75% near to unity allows for a factor-of-two speedup in experiments while maintaining the same signal-to-noise-ratio. In combination with high-fidelity readout based on spin-to-charge conversion, real-time initialization enables a factor-of-20 speedup over traditional methods, resulting in an ac magnetic sensitivity of 1.3 nT/Hz1/2 for our single NV-center spin. The real-time control method is immediately beneficial for quantum sensing applications with NV centers as well as probing charge-dependent physics, and it will facilitate protocols for quantum feedback control over multi-qubit systems.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{Breitweiser2019,
title = {Efficient optical quantification of heterogeneous emitter ensembles},
author = {S A Breitweiser and A L Exarhos and R N Patel and J Saouaf and B Porat and D A Hopper and L C Bassett},
url = {https://arxiv.org/abs/1909.12726
https://pubs.acs.org/doi/10.1021/acsphotonics.9b01707},
year = {2019},
date = {2019-12-17},
journal = {ACS Photonics},
volume = {7},
pages = {288-295},
abstract = {Defect-based quantum emitters in solid state materials offer a promising platform for quantum communication and sensing. Confocal fluorescence microscopy techniques have revealed quantum emitters in a multitude of host materials. In some materials, however, optical properties vary widely between emitters, even within the same sample. In these cases, traditional ensemble fluorescence measurements are confounded by heterogeneity, whereas individual defect-by-defect studies are impractical. Here, we develop a method to quantitatively and systematically analyze the properties of heterogeneous emitter ensembles using large-area photoluminescence maps. We apply this method to study the effects of sample treatments on emitters in hexagonal boron nitride, and we find that low-energy (3 keV) electron irradiation creates emitters, whereas high-temperature (850 ∘C) annealing in an inert gas environment brightens emitters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}