Prolonged Orbital Relaxation by Locally Modified Phonon Density of States for the 
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 Center in Nanodiamonds

Klotz, Marco; Fehler, Konstantin G.; Steiger, Elena S.; Häußler, Stefan; Waltrich, Richard; Reddy, Priyanka; Kulikova, L. F.; Davydov, V. A.; Агафонов, В.; Doherty, Marcus W.; Kubanek, Alexander

doi:10.1103/physrevlett.128.153602

Cited by 16 publications

(7 citation statements)

References 24 publications

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“…Indeed, in this group-IV defect, spin–orbit coupling splits the ground electronic state into a doublet by ∼0.2 meV (i.e., ∼50 GHz), , which causes efficient coupling of the two fine-structure sublevels to resonant phonon modes that remain populated at these temperatures. Various strategies have been developed to reduce orbital dephasing rates in the SiV ground state, such as using ultralow temperatures T ∼ 100 mK or fabricating complex diamond-based nanoelectromechanical structures. , Since spin relaxations are mediated by acoustic phonons that are strongly influenced by the phonon-mode density spectrum of the host diamond, the use of ultrasmall nanodiamonds should lead to the suppression of the low-energy phonon modes and thus to reduced orbital thermalization rates …”

supporting

confidence: 69%

Giant Quantum Electrodynamic Effects on Single SiV Color Centers in Nanosized Diamonds

Bézard,

Babaze,

Mindarava

et al. 2024

ACS Nano

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Understanding and mastering quantum electrodynamics phenomena is essential to the development of quantum nanophotonics applications. While tailoring of the local vacuum field has been widely used to tune the luminescence rate and directionality of a quantum emitter, its impact on their transition energies is barely investigated and exploited. Fluorescent defects in nanosized diamonds constitute an attractive nanophotonic platform to investigate the Lamb shift of an emitter embedded in a dielectric nanostructure with high refractive index. Using spectral and time-resolved optical spectroscopy of single SiV defects, we unveil blue shifts (up to 80 meV) of their emission lines, which are interpreted from model calculations as giant Lamb shifts. Moreover, evidence for a positive correlation between their fluorescence decay rates and emission line widths is observed, as a signature of modifications not only of the photonic local density of states but also of the phononic one, as the nanodiamond size is decreased. Correlative light−electron microscopy of single SiVs and their host nanodiamonds further supports these findings. These results make nanodiamond-SiVs promising as optically driven spin qubits and quantum light sources tunable through nanoscale tailoring of vacuum-field fluctuations.

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supporting

confidence: 69%

Giant Quantum Electrodynamic Effects on Single SiV Color Centers in Nanosized Diamonds

Bézard,

Babaze,

Mindarava

et al. 2024

ACS Nano

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“…19 c) left panel. Correspondingly, the spin dephasing time was also prolonged, as inferred from the dip width in coherent population trapping (CPT) experi-ments [88], see Fig. 19 c) right panel.…”

Section: Color Center In Nanodiamondsmentioning

confidence: 79%

“…For NDs of size smaller than about 100 nm an extended orbital relaxation rate was recently demonstrated. The orbital T 1 -time is prolonged by up to one order of magnitude as compared to the best achievable T 1 -time in bulk diamond [88], see Fig. 19 c) left panel.…”

Section: Color Center In Nanodiamondsmentioning

confidence: 92%

Hybrid Quantum Nanophotonics: Interfacing Color Center in Nanodiamonds with Si3N4-Photonics

Kubanek¹,

Ovvyan²,

Antoniuk³

et al. 2022

Preprint

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This chapter covers recent developments in the field of hybrid quantum photonics based on color centers in nanodiamonds and Si 3 N 4 -photonics towards a technology platform with applications in quantum information processing and quantum information distribution. The methodological approach can be divided in three main tasks. First, the fabrication and optimization of Si 3 N 4photonics. Second, the creation, characterization and control of color centers in nanodiamonds. Third, the assembly of hybrid quantum photonics by integrating the nanodiamonds into the photonic structures. One focus will be the efficient interfacing of the color centers done by optimizing the optical coupling. The chapter describes recent progress in all three steps and summarizes the established hybrid platform. We believe, that the hybrid approach provides a promising path to realize quantum photonic applications, such as quantum networks or quantum repeaters, in the near future.

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“…Expanding this tool chain to a smaller ND and to intrinsic coupling within the mode field maximum in combination with higher Q -factors will enable cooperativities well above 1. Recent developments of spin access via Purcell-broadened optical transitions and shown prolonged orbital relaxation open the door for spin-dependent device reflectivity in the strong coupling regime . Furthermore, recently shown two-photon interference between two remote NDs paves the way for distributing quantum information between remote quantum nodes. , While the optimization procedure is not yet a high-throughput operation, it nevertheless marks a crucial step for final device optimization and could be scaled-up by automatization.…”

Section: Discussionmentioning

confidence: 99%

Controlling All Degrees of Freedom of the Optical Coupling in Hybrid Quantum Photonics

Lettner,

Antoniuk,

Ovvyan

et al. 2024

ACS Photonics

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Nanophotonic quantum devices can significantly boost light−matter interaction, which is important for applications such as quantum networks. Reaching a high interaction strength between an optical transition of a spin system and a single mode of light is an essential step that demands precise control over all degrees of freedom of the optical coupling. While current devices have reached a high accuracy of emitter positioning, the placement process remains overall statistically, reducing the device fabrication yield. Furthermore, not all degrees of freedom of the optical coupling can be controlled, limiting the device performance. Here, we develop a hybrid approach based on negatively charged silicon vacancy center in nanodiamonds coupled to a mode of a Si 3 N 4photonic crystal cavity, where all terms of the coupling strength can be controlled individually. We used the frequency of coherent Rabi oscillations and line-broadening as a measure of the device performance. This allows for iterative optimization of the position and rotation of the dipole with respect to individual preselected modes of light. Therefore, our work marks an important step for optimization of hybrid quantum photonics and enables us to align device simulations with real device performance.

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Prolonged Orbital Relaxation by Locally Modified Phonon Density of States for the SiV− Center in Nanodiamonds

Cited by 16 publications

References 24 publications

Giant Quantum Electrodynamic Effects on Single SiV Color Centers in Nanosized Diamonds

Giant Quantum Electrodynamic Effects on Single SiV Color Centers in Nanosized Diamonds

Hybrid Quantum Nanophotonics: Interfacing Color Center in Nanodiamonds with Si3N4-Photonics

Controlling All Degrees of Freedom of the Optical Coupling in Hybrid Quantum Photonics

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