Hexagonal boron nitride: a review of the emerging material platform for single-photon sources and the spin–photon interface

• Stefania Castelletto,
• Faraz A. Inam,
• Shin-ichiro Sato and
• Alberto Boretti

Beilstein J. Nanotechnol. 2020, 11, 740–769, doi:10.3762/bjnano.11.61

• spin–photon interfaces for remote spin–photon entanglement with available nuclear spins as ancilla qubits for quantum memory [11][12]. These include the nitrogen-vacancy (NV) center in diamond [13], the silicon-vacancy center in diamond [14][15][16], the germanium-vacancy center in diamond [17], the

• divacancy (DV) in silicon carbide (SiC) [18][19][20], the silicon monovacancy in SiC [21][22][23], the carbon antisite vacancy pair in SiC [24][25], the silicon vacancy and nitrogen (N) atom on an adjacent carbon site in SiC [26][27][28], and rare-earth impurities in complex oxides [29]. While the NV center

• et al. [5] took the first step in this direction, showing how basic considerations of host properties (e.g., nuclear spin isotopes, bandgap, and spin–orbit coupling) can guide the identification of quantum point defects analogous to the diamond NV center, elevating SiC as such a host, with now many

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

• Alberto Boretti,
• Lorenzo Rosa,
• Jonathan Blackledge and
• Stefania Castelletto

Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207

• and Technology, University of Wales, Wrexham, United Kingdom Department of Computer Science, University of Western Cape, Cape Town, South Africa School of Engineering, RMIT University, Bundoora, Victoria, Australia 10.3762/bjnano.10.207 Abstract The nitrogen-vacancy (NV) center is a point defect in

• methods, this review presents a survey of the latest advances in NV center nano-MRI. Keywords: nanodiamonds; nanoscale magnetic resonance imaging (nano-MRI); nitrogen-vacancy center; optically detected magnetic resonance; Review Introduction Spin echoes and free induction decays were first detected in

• using ultra-low-field MRI and OMRI sequences. The difference images from the two methods reveal a higher contrast of the NDs compared to water. Moreover, this method permits a better tracking of NDs in biological samples using OMRI sequences. NV-center quantum sensing There are different concepts

Diamond nanophotonics

• Katja Beha,
• Helmut Fedder,
• Marco Wolfer,
• Merle C. Becker,
• Petr Siyushev,
• Mohammad Jamali,
• Anton Batalov,
• Christopher Hinz,
• Jakob Hees,
• Lutz Kirste,
• Harald Obloh,
• Etienne Gheeraert,
• Boris Naydenov,
• Ingmar Jakobi,
• Florian Dolde,
• Sébastien Pezzagna,
• Daniel Twittchen,
• Matthew Markham,
• Daniel Dregely,
• Harald Giessen,
• Jan Meijer,
• Fedor Jelezko,
• Christoph E. Nebel,
• Rudolf Bratschitsch,
• Alfred Leitenstorfer and
• Jörg Wrachtrup

Beilstein J. Nanotechnol. 2012, 3, 895–908, doi:10.3762/bjnano.3.100

• ; diamond; nanophotonics; NV center; plasmonic resonator; solid immersion lens; Introduction Single quantum emitters coupled to plasmonic and dielectric microresonators hold promise for novel photonic devices, such as optical transistors [1], optical quantum memories [2][3] and controlled single-photon

• dip at zero time delay amounts to 0.21. A value below 0.5 would explicitly indicate that a single NV center coupled to the cavity is a single photon source. There are two main factors that may currently limit the depth of the antibunching dip. First, background photoluminescence from the dielectric

• diamond layers has to be developed. As demonstrated and discussed in Section 1, ion implantation into bulk diamond crystals of high purity is a well-established technique [4] to produce defects such as the NV center, offering nanometer spatial resolution and a controlled defect density. A drawback, on the