<i>In-situ</i> tuning of individual position-controlled nanowire quantum dots via laser-induced intermixing

Fiset-Cyr, Alexis; Dalacu, Dan; Haffouz, S.; Poole, Philip J.; Lapointe, J.; Aers, G. C.; Williams, Robin L.

doi:10.1063/1.5040268

Cited by 16 publications

(10 citation statements)

References 32 publications

(36 reference statements)

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“…However, some nanowire quantum dots have also been reported [22] to show negative biexciton binding energies of about -1.5 meV and a number of effects have not yet been accounted for in the modelling. For example, studies of laser-induced atom intermixing [64] highlight the possibility of diffusion processes and suggests the existence of some defects. Furthermore, as in Stranski-Krastanov-grown quantum dots, there may be a tendency for As atoms to cluster so that the distribution is no longer uniform within one monolayer.…”

Section: Discussionmentioning

confidence: 99%

Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots

2020

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We present here an atomistic theory of the electronic and optical properties of hexagonal InAsP quantum dots in InP nanowires in the wurtzite phase. These self-assembled quantum dots are unique in that their heights, shapes, and diameters are well known. Using a combined valenceforce-field, tight-binding, and configuration-interaction approach we perform atomistic calculations of single-particle states and excitonic, biexcitonic and trion complexes as well as emission spectra as a function of the quantum dot height, diameter and As versus P concentration. The atomistic tight-binding parameters for InAs and InP in the wurtzite crystal phase were obtained by ab initio methods corrected by empirical band gaps. The low energy electron and hole states form electronic shells similar to parabolic or cylindrical quantum confinement, only weakly affected by hexagonal symmetry and As fluctuations. The relative alignment of the emission lines from excitons, trions and biexcitons agrees with that for InAs/InP dots in the zincblende phase in that biexcitons and positive trions are only weakly bound. The random distribution of As atoms leads to dot-to-dot fluctuations of a few meV for the single-particle states and the spectral lines. Due to the high symmetry of hexagonal InAsP nanowire quantum dots the exciton fine structure splitting is found to be small, of the order a few µeV with significant random fluctuations in accordance with experiments.

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Section: Discussionmentioning

confidence: 99%

Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots

2020

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“…Additionally, easy incorporation of coherent optical control is necessary. Our choice of nanowire QDs, motivated here by the deterministic positioning and high extraction efficiency, can potentially be individually tuned using strain [55][56][57] but the dangling bonds at the nanowire sidewalls likely will remain an obstacle to reduce charge noise and the nanowire geometry hinders resonant laser excitation in the dark-field configuration. Ideally, the emitters would be incorporated into a heterostructure device with individual contacts for each spatial position in the array to provide charge control, control of the emitter energy, charge-environment stabilization, and suppression of solid-state environmental noise [58,59].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

et al. 2020

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Solid-state quantum emitters are excellent sources of on-demand indistinguishable or entangled photons and can host long-lived spin memories, crucial resources for photonic quantum-information applications. However, their scalability remains an outstanding challenge. Here, we present a scalable technique to multiplex streams of photons from multiple independent quantum dots, on chip, into a fiber network for use "off chip." Multiplexing is achieved by incorporating a multicore fiber into a confocal microscope and spatially matching the multiple foci, seven in this case, to quantum dots in an array of deterministically positioned nanowires. As a proof-of-principle demonstration, we perform parallel spectroscopy on the nanowire array to identify two nearly identical quantum dots at different positions, which are subsequently tuned into resonance with an external magnetic field. Multiplexing of background-free single photons from these two quantum dots is then achieved. Our approach, applicable to all types of quantum emitters, can readily be integrated into scalable photonic based quantum technologies.

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“…Additionally, easy incorporation of coherent optical control is necessary. Our choice of nanowire QDs, motivated here by the deterministic positioning and high extraction efficiency, can potentially be individually tuned using strain [62][63][64], but the dangling bonds at the nanowire sidewalls likely will remain an obstacle to reduce charge noise and the nanowire geometry hinders resonant laser excitation in the dark-field configuration. Ideally, the emitters would be incorporated into a heterostructure device with individual contacts for each spatial position in the array to provide charge control, control of the emitter energy, charge environment stabilization, and suppression of solid-state environmental noise [65,66].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

Koong,

Ballesteros-Garcia,

Proux

et al. 2020

Preprint

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Solid-state quantum emitters are excellent sources of on-demand indistinguishable or entangled photons and can host long-lived spin memories, crucial resources for photonic quantum information applications. However, their scalability remains an outstanding challenge. Here we present a scalable technique to multiplex streams of photons from multiple independent quantum dots, on-chip, into a fiber network for use "off-chip. Multiplexing is achieved by incorporating a multi-core fiber into a confocal microscope and spatially matching the multiple foci, seven in this case, to quantum dots in an array of deterministically positioned nanowires. First, we report the coherent control of the emission of biexciton-exciton cascade from a single nanowire quantum dot under resonant twophoton excitation. Then, as a proof-of-principle demonstration, we perform parallel spectroscopy on the nanowire array to identify two nearly identical quantum dots at different positions which are subsequently tuned into resonance with an external magnetic field. Multiplexing of background-free single photons from these two quantum dots is then achieved. Our approach, applicable to all types of quantum emitters, can readily be scaled up to multiplex > 100 quantum light sources, providing a breakthrough in hardware for photonic based quantum technologies. Immediate applications include quantum communication, quantum simulation, and quantum computation.

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In-situ tuning of individual position-controlled nanowire quantum dots via laser-induced intermixing

Cited by 16 publications

References 32 publications

Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots

Atomistic theory of electronic and optical properties of InAsP/InP nanowire quantum dots

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

Multiplexed Single Photons from Deterministically Positioned Nanowire Quantum Dots

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