Spectroscopic investigations of negatively charged tin-vacancy centres in diamond

Görlitz, Johannes; Herrmann, Dennis; Thiering, Gergő; Fuchs, Philipp; Gandil, Morgane; Iwasaki, Takayuki; Taniguchi, Takashi; Kieschnick, Michael; Meijer, Jan; Hatano, Mutsuko; Gali, Ádám; Becher, Christoph

doi:10.1088/1367-2630/ab6631

Cited by 88 publications

(92 citation statements)

References 42 publications

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“…Moreover, our resonator is fully fiber-integrated and alignment-free. It is therefore suitable for a large variety of emitters [4,[44][45][46][47][48][49] and, thanks to its implementation in a cryogenic environment without any loss in transmission, might also be used for the implementation of quantum hybrid systems [50,51].…”

Section: Resultsmentioning

confidence: 99%

Nanofiber-based high-Q microresonator for cryogenic applications

Hütner¹,

Hoinkes²,

Becker³

et al. 2020

Opt. Express

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We demonstrate a cryo-compatible, fully fiber-integrated, alignment-free optical microresonator. The compatibility with low temperatures expands its possible applications to the wide field of solid-state quantum optics, where a cryogenic environment is often a requirement. At a temperature of 4.6 K we obtain a quality factor of (9.9 ± 0.7) × 10 6 . In conjunction with the small mode volume provided by the nanofiber, this cavity can be either used in the coherent dynamics or the fast cavity regime, where it can provide a Purcell factor of up to 15. Our resonator is therefore suitable for significantly enhancing the coupling between light and a large variety of different quantum emitters and due to its proven performance over a wide temperature range, also lends itself for the implementation of quantum hybrid systems. IntroductionAchieving efficient coupling between quantum emitters and light is an important goal of research in quantum communication and computation, sensor applications and fundamental studies. Such an efficient interaction can for example be realized by means of an optical cavity or by reducing the mode area of the light field to the size of the emitter's interaction cross-section. Optical nanofibers offer such a strong transverse confinement of the light field.This makes them a versatile tool for interfacing different types of emitters such as atoms [1-3], single molecules [4], quantum dots [5][6][7] and color centers in diamond [8,9]. For many proof-of-principle experiments, cold atoms were the emitters of choice as they represent a well-controlled and isolated system. However, the experimental overhead for a cold-atom set-up is significant and solid-state emitters are much more suitable for practical and scalable platforms for quantum networks or nanosensors [10,11].Yet, the optical transitions of solid state emitters also couple to the phononic degrees of freedom of the system, leading to dephasing and inelastic scattering. In order to avoid this problem, the phonons of the system have to be frozen out and the branching ratio of emission into the coherent zero-phonon line has to be maximized. Further, cryogenic temperatures may be required to be able to spectrally address individual solid state emitters in the case, where many are present in the same host system [4]. This calls for a cryo-compatible optical microresonator with high quality factor, Q, that selectively accelerates the desired optical transition via the Purcell effect [12][13][14][15].Here, we show that a fully fiber-based optical microresonator that consists of a tapered optical fiber with two integrated fiber Bragg gratings (FBGs) [16,17], as demonstrated in [18], can be employed at cryogenic temperatures. In particular, we confirm that a high Q factor prevails after contact gas-cooling from room temperature to liquid helium temperature. Consequently, the resonator is still compatible with reaching the strong coupling regime. Furthermore, for usage at cryogenic temperatures, the alignment-free character of our resonator represen...

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Section: Resultsmentioning

confidence: 99%

Nanofiber-based high-Q microresonator for cryogenic applications

Hütner¹,

Hoinkes²,

Becker³

et al. 2020

Opt. Express

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“…Owing to the large size of the Sn atom, higher temperatures and or pressures are required to heal the larger implantation defects. Using a high-pressure high-temperature (HPHT) treatment at 2100 C under 7.7 GPa removes all PL lines except the 620 nm SnV - [65,67] and gives a creation efficiency in the range 1-4% for 150 keV. Similar values were reported (for Sn at about 80 keV) at lower temperatures and no pressure applied: from 0.6% at 800 C to 2.5% at 1200 C, 4 h each [14] and 5% at 950 C for 2 h. [66] It is even more challenging to produce PbV centers due to the very large Pb atom.…”

Section: Other Color Centersmentioning

confidence: 99%

Charge‐Assisted Engineering of Color Centers in Diamond

Lühmann

Meijer

Pezzagna

2021

Physica Status Solidi (a)

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Owing to its unique optical and spin properties, the nitrogen‐vacancy (NV) center holds the promise of a diamond‐based room‐temperature scalable quantum computer, but the numerous technical and physical issues are not yet overcome, especially the poor N to NV conversion. The NV and other color centers are, however, successfully used as multitasking quantum sensors, and open new routes in quantum sensing technologies. Most recently, several breakthroughs and demonstrations were achieved, shedding a new light on the feasibility of a NV‐based quantum computer. Herein, the recently developed method of charge‐assisted single defect engineering is reviewed. With a controlled charging of the involved species, it modifies the diffusion or kinetics of defect formation and acts as a catalyzer of the NV creation while hindering the formation of competing and perturbing defects such as divacancies or NVH. Very high NV creation yields up to 75% are obtained and the method is suitable to other impurity‐vacancy defects. Furthermore, it has positive consequences on the charge state stability and coherence time of the NV centers, which is as well discussed. Together with the possibility to nowadays deterministically implant single ions, this powerful method brings the scalability of NV qubits closer.

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“…Group IV colour centres have also been coupled to nanocavities with cooperativity C = 105 ± 11, resulting in Purcell enhancement of the radiative decay paths and an improvement of η QE [62]. The SiV group IV colour centre has η DWF = 0.7-0.8 [64,65], whilst the tin and germanium vacancies have been measured at η DWF = 0.6 [70,74]. Of the group IV colour centres, the most widely studied has been SiV [36,61,63,66,71,[95][96][97][98], for which a dynamically decoupled coherence time T 2 has been shown to exceed 10 ms at 100 mK [63].…”

Section: Suitable Systems For Implementationmentioning

confidence: 99%

Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register

Michaels

Martínez

Debroux

et al. 2021

Quantum

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Photonic cluster states are a powerful resource for measurement-based quantum computing and loss-tolerant quantum communication. Proposals to generate multi-dimensional lattice cluster states have identified coupled spin-photon interfaces, spin-ancilla systems, and optical feedback mechanisms as potential schemes. Following these, we propose the generation of multi-dimensional lattice cluster states using a single, efficient spin-photon interface coupled strongly to a nuclear register. Our scheme makes use of the contact hyperfine interaction to enable universal quantum gates between the interface spin and a local nuclear register and funnels the resulting entanglement to photons via the spin-photon interface. Among several quantum emitters, we identify the silicon-29 vacancy centre in diamond, coupled to a nanophotonic structure, as possessing the right combination of optical quality and spin coherence for this scheme. We show numerically that using this system a 2×5-sized cluster state with a lower-bound fidelity of 0.5 and repetition rate of 65 kHz is achievable under currently realised experimental performances and with feasible technical overhead. Realistic gate improvements put 100-photon cluster states within experimental reach.

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Spectroscopic investigations of negatively charged tin-vacancy centres in diamond

Cited by 88 publications

References 42 publications

Nanofiber-based high-Q microresonator for cryogenic applications

Nanofiber-based high-Q microresonator for cryogenic applications

Charge‐Assisted Engineering of Color Centers in Diamond

Multidimensional cluster states using a single spin-photon interface coupled strongly to an intrinsic nuclear register

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