Cryogenic platform for coupling color centers in diamond membranes to a fiber-based microcavity

Salz, M.; Herrmann, Yanik; Nadarajah, Arunan; Stahl, A.; Hettrich, M.; Stacey, Alastair; Prawer, S.; Hunger, David; Schmidt‐Kaler, F.

doi:10.1007/s00340-020-07478-5

Cited by 18 publications

(15 citation statements)

References 66 publications

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“…So far, open microcavities have been coupled to a multitude of quantum systems including atoms [224], ions [82,225], molecules [80,226], quantum dots [227], rare earth ions [228], optomechanical systems [229], and color centers in both nanodiamonds [108][109][110][111][112]126] and diamond membranes [128,[230][231][232].…”

Section: Open Fabry-perot Microcavitiesmentioning

confidence: 99%

Cavity quantum electrodynamics with color centers in diamond

Janitz

Bhaskar

Childress

2020

Optica

106

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Coherent interfaces between optical photons and long-lived matter qubits form a key resource for a broad range of quantum technologies. Cavity quantum electrodynamics (cQED) offers a route to achieve such an interface by enhancing interactions between cavity-confined photons and individual emitters. Over the last two decades, a promising new class of emitters based on defect centers in diamond have emerged, combining long spin coherence times with atom-like optical transitions. More recently, advances in optical resonator technologies have made it feasible to realize cQED in diamond. This article reviews progress towards coupling color centers in diamond to optical resonators, focusing on approaches compatible with quantum networks. We consider the challenges for cQED with solid-state emitters and introduce the relevant properties of diamond defect centers before examining two qualitatively different resonator designs: micron-scale Fabry-Perot cavities and diamond nanophotonic cavities. For each approach, we examine the underlying theory and fabrication, discuss strengths and outstanding challenges, and highlight state-of-the-art experiments.

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Section: Open Fabry-perot Microcavitiesmentioning

confidence: 99%

Cavity quantum electrodynamics with color centers in diamond

Janitz

Bhaskar

Childress

2020

Optica

106

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“…A long coherence time for these defect related electronic states is facilitated by the wide-bandgap material (≈5.5 eV for bulk diamond), since diamond crystals are relatively free of background nuclear spins and feature a low electron concentration as well as low phonon scattering rate [21,22]. These color centers, such as the nitrogen-vacancy (NV) center [23,24], the silicon-vacancy (SiV) center [25,26] or the germanium-vacancy center (GeV) [27,28], exhibit a high photostability at room temperature, polarizability and allow a practicable control of coherent single spins, hence serving as single-photon emitters. In particular, the prominent NV color center presents a promising candidate for quantum memory bits due to its long-lived and well-defined spin quantum states [29].…”

Section: Introductionmentioning

confidence: 99%

“…However, nanofabrication produces near-surface damage, and in particular for the NV center, it was found that this leads to a substantial degradation of the optical coherence properties. The most promising approach is to use minimally processed diamond membranes with a thickness of a few micrometers where color centers remain far away from surfaces, which are introduced into open-access microcavities by bonding to one of the cavity mirrors [25,26,36]. Such microcavities allow for spatial and spectral tunability in order to controllably match the geometrical and spectral overlap of a cavity mode with a selected color center.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Single-Crystal Diamond Membranes for Quantum Photonics with Tunable Microcavities

et al. 2020

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The development of quantum technologies is one of the big challenges in modern research. A crucial component for many applications is an efficient, coherent spin–photon interface, and coupling single-color centers in thin diamond membranes to a microcavity is a promising approach. To structure such micrometer thin single-crystal diamond (SCD) membranes with a good quality, it is important to minimize defects originating from polishing or etching procedures. Here, we report on the fabrication of SCD membranes, with various diameters, exhibiting a low surface roughness down to 0.4 nm on a small area scale, by etching through a diamond bulk mask with angled holes. A significant reduction in pits induced by micromasking and polishing damages was accomplished by the application of alternating Ar/Cl2 + O2 dry etching steps. By a variation of etching parameters regarding the Ar/Cl2 step, an enhanced planarization of the surface was obtained, in particular, for surfaces with a higher initial surface roughness of several nanometers. Furthermore, we present the successful bonding of an SCD membrane via van der Waals forces on a cavity mirror and perform finesse measurements which yielded values between 500 and 5000, depending on the position and hence on the membrane thickness. Our results are promising for, e.g., an efficient spin–photon interface.

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“…We consider that the remaining thickness variation can be further improved by optimization of the polishing process and technique [48]. We note that color centers such as NV and SiV centers can be created in the SCDM via CVD growth [41] or ion implantation [49].…”

mentioning

confidence: 99%

“…The removal of the ion-damaged layer and thinning of the SCDM down to the desired thickness are made possible by oxygen-plasma RIE during the SCDM fabrication. We note that color centers such as NV and SiV centers can be created in the SCDM via CVD growth [39] or ion implantation [45].…”

mentioning

confidence: 99%

Telecommunication-wavelength two-dimensional photonic crystal cavities in a thin single-crystal diamond membrane

Kuruma

Piracha

Renaud

et al. 2021

Applied Physics Letters

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We demonstrate two-dimensional photonic crystal cavities operating at telecommunication wavelengths in a single-crystal diamond membrane. We use a high-optical-quality and thin (~ 300 nm) diamond membrane, supported by a polycrystalline diamond frame, to realize fully suspended two-dimensional photonic crystal cavities with a high theoretical quality factor of ~ 8×10 6 and a relatively small mode volume of ~2 (λ/n) 3 . The cavities are fabricated in the membrane using electron-beam lithography and vertical dry etching. We observe cavity resonances over a wide wavelength range spanning the telecommunication O-and Sbands (1360 nm-1470 nm) with Q factors of up to ~1800. Our method paves the way for onchip diamond nanophotonic applications in the telecommunication-wavelength range.

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Cryogenic platform for coupling color centers in diamond membranes to a fiber-based microcavity

Cited by 18 publications

References 66 publications

Cavity quantum electrodynamics with color centers in diamond

Cavity quantum electrodynamics with color centers in diamond

Fabrication and Characterization of Single-Crystal Diamond Membranes for Quantum Photonics with Tunable Microcavities

Telecommunication-wavelength two-dimensional photonic crystal cavities in a thin single-crystal diamond membrane

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