High-performance diamond-based single-photon sources for quantum communication

Su, Chun‐Hsu; Greentree, Andrew D.; Hollenberg, Lloyd C. L.

doi:10.1103/physreva.80.052308

Cited by 37 publications

(28 citation statements)

References 81 publications

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“…This could be fundamentally improved by a change of the relative emission pathways associated with the Purcell-enhancement of a particular emission wavelength of the NV centres inside a cavity. Purcell enhancement is, by now, an established technique [60][61][62][63][64] . An enhancement of the ZPL has a twofold advantage: The emission on the phonon sideband is reduced relative to the ZPL which does not create any phonons and the optical life-time of the NV is shortened, strengthening the radiative decay relative to any non-radiative pathways, which do not change in their decay rate, i.e.…”

Section: Discussionmentioning

confidence: 99%

Optical cryocooling of diamond

et al. 2017

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The cooling of solids by optical means only using anti-Stokes emission has a long history of research and achievements. Such cooling methods have many advantages ranging from no-moving parts or fluids through to operation in vacuum and may have applications to cryosurgery. However achieving large optical cryocooling powers has been difficult to achieve except in certain rare-earth crystals. Through study of the emission and absorption cross sections we find that diamond, containing either NV or SiV (Nitrogen or Silicon vacancy), defects shows potential for optical cryocooling and in particular, NV doping shows promise for optical refrigeration. We study the optical cooling of doped diamond microcrystals ranging 10−250 µm in diameter trapped either in vacuum or in water. For the vacuum case we find NV-doped microdiamond optical cooling below room temperature could exceed |∆T | > 10 K, for irradiation powers of Pin < 100 mW. We predict that such temperature changes should be easily observed via large alterations in the diffusion constant for optically cryocooled microdiamonds trapped in water in an optical tweezer or via spectroscopic signatures such as the ZPL width or Raman line.Optical refrigeration, or optical cryocooling, uses antiStokes emission in solids to deplete the phonon population within the solid, cooling it. First suggested by Pringsheim 1 , and initially demonstrated by Epstein et al in 19952 , the phenomena is observed when low entropy laser light is primarily absorbed at wavelengths slightly longer than the mean fluorescence wavelength (λ f ) of the material. The light is reemitted with a broadband fluorescence possessing a mean energy which is higher than the incident pump laser. The increase in energy is due to absorption of lattice phonons (vibrations), reducing the net temperature of the solid. Optical refrigeration has experimentally achieved temperatures of T ∼155K (from room temperature) using ytterbium-doped fluoride crystal (YLiF 4 : Yb 3+ ) 3 , T ∼250K (from 290K), for the semiconductor CdS 4 , and T ∼114K more recently using a multi-pass setup with Yb-doped crystals 5 . These temperatures outperform Peltier/thermoelectric coolers and reach into the defined cryogenic regime (<123K). Importantly they operate with no mechanical vibrations, magnetic/electric fields or moving mechanical/liquid/gas components and are ideal refrigeration solutions in many difficult/sensitive situations eg. optomechanical, space, sensing experiments 6-9 . In addition, spin properties of diamond defects have recently attracted much attention owing to their long spin coherence times T 2 . Since T 2 times increase at low temperatures, a new way of cooling diamond is important for applications where long spin relaxation times are needed. Microscopic diamond crystals are highly biocompatible and can be functionalised to attach to specific biologically important ligands 10 . Cryosurgery and cryotherapy is a method to destroy diseased or harmful tissues within the body and involves cyclic freezing and thawing of the ...

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Section: Discussionmentioning

confidence: 99%

Optical cryocooling of diamond

et al. 2017

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“…The successful integration of diamond-based emitters in microcavities and their further applications in quantum communications channels can be critically dependent on the emitter, as outlined by Su et al [41]. ZPLs with the characteristic emission of the one presented here will be more practically usable in existing hybrid integrated photonic systems [42] that are mostly relying on narrow-bandwidth emission around 780 nm or even longer wavelength emission.…”

Section: Discussionmentioning

confidence: 94%

Production of Multiple Diamond-Based Single-Photon Sources

Castelletto

Edmonds

Gaebel

et al. 2012

IEEE J. Select. Topics Quantum Electron.

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Fluorescent emitters in diamond are considered to be a valuable resource for fields such as quantum communication, quantum photonics, and biological imaging. In this paper, we report a wide range of narrow bandwidth (∼1.5 nm) spectral emission lines arising from different color centers at room temperature. The defects were created by chemical vapor deposition of thin diamond films grown on silica substrates seeded with nanoparticles of diamond and nickel. These fluorescent lines also possess single or few centers photon statistics. We correlate the zero-phonon lines, observed using confocal microscopy, with previously identified nickel-related centers which have been observed in high-pressure high-temperature diamond, with a Si/Ni complex and silicon vacancy defects. We compare our findings with recent results demonstrating single-photon emission in diamond associated with nickel-related centers to clarify and summarize previous studies concerning this specific dopant. The great variety of emission lines observed in the synthesized material, mainly associated with nickel-related centers, could be an important resource for applications relying on the presence of several emitters of single photons in the same sample. Moreover, the possibility of mass production of these centers in nanodiamonds in colloidal suspension may provide an important resource for biomarking and microscopy.Index Terms-Confocal microscopy, diamond defects, singlephoton emission.

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“…A full review of the suitability of many of these centres for QKD can be found in Ref. [80]. To aid discrimination above background, small full-width half-maxima are preferred, and this also assists in combating dispersion for fibre implementations.…”

Section: Summary Of Candidate Systemsmentioning

confidence: 99%