Dynamically unpolarized single-photon source in diamond with intrinsic randomness

Abe, Nobuhiro; Mitsumori, Yasuyoshi; Sadgrove, Mark; Edamatsu, Keiichi

doi:10.1038/srep46722

Cited by 17 publications

(18 citation statements)

References 32 publications

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“…In this study, we used a commercially available sample produced by CVD (chemical vapor deposition), corresponding to Element Six's highest purity diamond (type IIa, 2 × 2 × 0.5 mm 3 ), whose nitrogen impurities are below 5 ppb (usually < 1 ppb) and the concentration of nitrogen vacancies are lower than 0.03 ppb. Crystallographic orientation is 100% single sector [100] and polishing. The diamond crystal lattice presents inversion symmetry, due to its cubic structure, and second-order nonlinearities are absent.…”

Section: Resultsmentioning

confidence: 99%

“…These experiments showed that the creation of the NV center is a stochastic process. (21,86) Besides, in Figure 53 we can see that the minimum time to create an ensemble of NV is 2 s, at the power level and conditions used here. From the zero-field ODMR, we observed that the local field (strain) around the NV center is much higher than usual, and it changes with the illumination time, this may be because the femtosecond laser modifies the local structure of the diamond, in the region illuminated by the laser.…”

Section: Third Experimentsmentioning

confidence: 92%

“…The crystal is a (100) oriented plate whose edges coincide with axes [100], [010] and [001], which represent the lab reference frame, denoted here as (x, y, z). The electronic grade single crystal was thinned and polished to a 2 × 2 × 0.1 mm 3 size.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In addition to the particle energy, another tunable parameter is the irradiation dose, which determines the density of vacancies generated in the sample. (82)(83)(84) Alternatively, a recently proposed method is to use femtosecond laser illumination (21,(85)(86)(87)(88), where the ultra-short intense pulses propagating in air induce ionization of molecules like O 2 and N 2 , generating free electrons that are accelerated by the subsequent pulses, producing a beam of electrons that collide with some atoms of carbon at the diamond surface, taking them out of the crystal lattice, thus generating the vacancies. These vacancies can move during annealing (at high temperatures), therefore, creating the possibility of binding to some nitrogen impurity in the crystal, resulting in the NV center.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, its ability to hold stable color centers, able of acting as single photon sources, has motivated many applications in quantum information science. (98)(99)(100)(101) Recent advances on the fabrication of synthetic diamonds, along with good control of color centers have resulted in significant progress towards the development of diamond Raman lasers (102,103) and quantum optics. (98,101,104,105) On the other hand, studies on the nonlinear optical properties of diamond are still limited, hindering the full development of integrated diamond photonics platforms.…”

Section: Introductionmentioning

confidence: 99%

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Diamond studies for applications in quantum technologies

Segura¹

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To my grandparents Aniceto and Clara, and to loving memory of my grandparents Marcelino and Teresa this humble work is a sign of my love to you. First, I would like thank my advisor Prof. Dr. Sérgio Muniz, for his support from day one to this project and my scientific career. His encouragement always gave me the confidence and energy to finish this project. He also allowed me a lot of flexibility and freedom so that I can become an independent researcher. I am thankful for his kindness, patience, friendship, and support throughout these years. I wish to thank Prof. Dr. Francisco Guimarães for the help with analysis the photoluminescence of the NV center and sharing his knowledge on using the confocal microscope. The discussions were of extreme relevance.

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Section: Resultsmentioning

confidence: 99%

Section: Third Experimentsmentioning

confidence: 92%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diamond studies for applications in quantum technologies

Segura¹

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Modeling of Radiative Emission from Shallow Color Centers in Single Crystalline Diamond

Zahedian

Liu

Vidrio

et al. 2023

Laser & Photonics Reviews

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Optically active defects in diamond are widely used as bright single‐photon sources for quantum sensing, computing, and communication. For many applications, it is useful to place the emitter close to the diamond surface, where the radiative properties of the emitter are strongly modified by its dielectric environment. It is well‐known that the radiative power from an electric dipole decreases as the emitter approaches an interface with a lower‐index dielectric, leading to an increase in the radiative lifetime. For emitters in crystalline solids, modeling of this effect needs to take into account the crystal orientation and direction of the surface cut, which can greatly impact the emission characteristics. In this paper, a framework for analyzing the emission rates of shallow (<100 nm) defects is provided, in which optical transitions are derived from electric dipoles in a plane perpendicular to their spin axis. The calculations for the depth‐dependent radiative lifetime for color centers in (100)‐, (110)‐, and (111)‐cut diamond are presented, which can be extended to other vacancy defects in diamond.

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Colossal Core/Shell CdSe/CdS Quantum Dot Emitters

Nguyen,

Hammel,

Sharp

et al. 2024

ACS Nano

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Single-photon sources are essential for advancing quantum technologies with scalable integration being a crucial requirement. To date, deterministic positioning of singlephoton sources in large-scale photonic structures remains a challenge. In this context, colloidal quantum dots (QDs), particularly core/shell configurations, are attractive due to their solution processability. However, traditional QDs are typically small, about 3 to 6 nm, which restricts their deterministic placement and utility in large-scale photonic devices, particularly within optical cavities. The largest existing core/shell QDs are a family of giant CdSe/CdS QDs, with total diameters ranging from about 20 to 50 nm. Pushing beyond this size limit, we introduce a synthesis strategy for colossal CdSe/CdS QDs, with sizes ranging from 30 to 100 nm, using a stepwise high-temperature continuous injection method. Electron microscopy reveals a consistent hexagonal diamond morphology composed of 12 semipolar {101̅ 1} facets and one polar (0001) facet. We also identify conditions where shell growth is disrupted, leading to defects, islands, and mechanical instability, which suggest synthetic requirements for growing crystalline particles beyond 100 nm. The stepwise growth of thick CdS shells on CdSe cores enables the synthesis of emissive QDs with long photoluminescence lifetimes of a few microseconds and suppressed blinking at room temperature. Notably, QDs with 80 and 100 CdS monolayers exhibit high single-photon emission purity with second-order photon correlation g (2) (0) values below 0.2.

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Dynamically unpolarized single-photon source in diamond with intrinsic randomness

Cited by 17 publications

References 32 publications

Diamond studies for applications in quantum technologies

Diamond studies for applications in quantum technologies

Modeling of Radiative Emission from Shallow Color Centers in Single Crystalline Diamond

Colossal Core/Shell CdSe/CdS Quantum Dot Emitters

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