An NV- center in magnesium oxide as a spin qubit for hybrid quantum technologies

• URL: http://arxiv.org/abs/2409.00246v2
• Date: Fri, 24 Jan 2025 04:58:33 GMT
• Title: An NV- center in magnesium oxide as a spin qubit for hybrid quantum technologies
• Authors: Vrindaa Somjit, Joel Davidsson, Yu Jin, Giulia Galli,
• Abstract summary: We identify a negative complex between a nitrogen interstitial and a magnesium vacancy in MgO with favorable electronic and optical properties.<n>We show that this NV- center has stable triplet ground and excited states, with singlet shelving states enabling optical readout.<n>We propose that the favorable properties of the NV- defect, along with the technological maturity of MgO, could enable hybrid classical-quantum applications.
• Score: 1.2774526936067931
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Recent predictions suggest that oxides, such as MgO and CaO, could serve as hosts of spin defects with long coherence times and thus be promising materials for quantum applications. However, in most cases specific defects have not yet been identified. Here, by using a high-throughput first-principles framework and advanced electronic structure methods, we identify a negatively-charged complex between a nitrogen interstitial and a magnesium vacancy in MgO with favorable electronic and optical properties for hybrid quantum technologies. We show that this NV- center has stable triplet ground and excited states, with singlet shelving states enabling optical initialization and spin-dependent readout. We predict several properties, including absorption, emission, and zero-phonon line energies, as well as zero-field splitting tensor, and hyperfine interaction parameters, which can aid in the experimental identification of this defect. Our calculations show that due to a strong pseudo-Jahn Teller effect and low frequency phonon modes, the NV- center in MgO is subject to a substantial vibronic coupling. We discuss design strategies to reduce such coupling and increase the Debye-Waller factor, including the effect of strain and the localization of the defect states. We propose that the favorable properties of the NV- defect, along with the technological maturity of MgO, could enable hybrid classical-quantum applications, such as spintronic quantum sensors and single qubit gates.

Related papers

• Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
  Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature. We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs. Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
  arXiv  Detail & Related papers  (2024-05-03T23:02:30Z)
• Quantum bit with telecom wave-length emission from a simple defect in Si [4.1020458874018795]
  Controlled creation and erasure of simple carbon interstitial defects have been successfully realised in silicon. This defect has a stable structure near room temperature and emits in the wave-length where the signal loss is minimal. We propose that a carbon interstitial can act as a quantum bit and may realize a spin-to-photon interface in CMOS-compatible platforms.
  arXiv  Detail & Related papers  (2024-04-25T20:46:54Z)
• Comprehensive scheme for identifying defects in solid-state quantum systems [0.0]
  A solid-state quantum emitter is one of the indispensable components for optical quantum technologies. We demonstrate the calculation of the complete optical fingerprints of quantum emitters in hexagonal boron nitride. We apply this approach to predict the suitability for using the emitters in specific quantum applications.
  arXiv  Detail & Related papers  (2023-05-29T05:28:27Z)
• Midgap state requirements for optically active quantum defects [0.0]
  Optically active quantum defects play an important role in quantum sensing, computing, and communication. It is commonly assumed that only quantum defects introducing levels well within the band gap and far from the band edges are of interest for quantum technologies. We show that optically active defects with energy levels close to the band edges can display similar properties.
  arXiv  Detail & Related papers  (2023-02-21T16:07:04Z)
• Jaynes-Cummings interaction between low energy free-electrons and cavity photons [0.571097144710995]
  We propose a new approach to realize the Jaynes-Cummings Hamiltonian using low energy free-electrons coupled to dielectric microcavities. Our approach utilizes quantum recoil, which causes a large detuning that inhibits the emission of multiple consecutive photons. We show that this approach can be used for generation of single photons with unity efficiency and high fidelity.
  arXiv  Detail & Related papers  (2023-02-03T07:06:51Z)
• All-Optical Nuclear Quantum Sensing using Nitrogen-Vacancy Centers in Diamond [52.77024349608834]
  Microwave or radio-frequency driving poses a significant limitation for miniaturization, energy-efficiency and non-invasiveness of quantum sensors. We overcome this limitation by demonstrating a purely optical approach to coherent quantum sensing. Our results pave the way for highly compact quantum sensors to be employed for magnetometry or gyroscopy applications.
  arXiv  Detail & Related papers  (2022-12-14T08:34:11Z)
• Demonstration of electron-nuclear decoupling at a spin clock transition [54.088309058031705]
  Clock transitions protect molecular spin qubits from magnetic noise. linear coupling to nuclear degrees of freedom causes a modulation and decay of electronic coherence. An absence of quantum information leakage to the nuclear bath provides opportunities to characterize other decoherence sources.
  arXiv  Detail & Related papers  (2021-06-09T16:23:47Z)
• Cavity Quantum Electrodynamics Design with Single Photon Emitters in Hexagonal Boron Nitride [6.352389759470726]
  We numerically investigate the cavity quantum electrodynamics (cavity-QED) scheme incorporating defect-enabled single photon emitters in h-BN microdisk resonators. The whispering-gallery nature of microdisks can support multiple families of cavity resonances with different radial and azimuthal mode indices simultaneously. This study contributes toward realizing h-BN photonic components, such as low-threshold microcavity lasers and high-purity single photon sources.
  arXiv  Detail & Related papers  (2021-06-05T21:53:44Z)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)
• Probing the coherence of solid-state qubits at avoided crossings [51.805457601192614]
  We study the quantum dynamics of paramagnetic defects interacting with a nuclear spin bath at avoided crossings. The proposed theoretical approach paves the way to designing the coherence properties of spin qubits from first principles.
  arXiv  Detail & Related papers  (2020-10-21T15:37:59Z)
• A multiconfigurational study of the negatively charged nitrogen-vacancy center in diamond [55.58269472099399]
  Deep defects in wide band gap semiconductors have emerged as leading qubit candidates for realizing quantum sensing and information applications. Here we show that unlike single-particle treatments, the multiconfigurational quantum chemistry methods, traditionally reserved for atoms/molecules, accurately describe the many-body characteristics of the electronic states of these defect centers.
  arXiv  Detail & Related papers  (2020-08-24T01:49:54Z)
• Dynamic modulation of phonon-assisted transitions in quantum defects in monolayer transition-metal dichalcogenide semiconductors [0.0]
  We study the effect of spin-orbit coupling on the electron-phonon interaction in a single chalcogen vacancy defect. We find that spin-orbit tune the magnitude of the electron-phonon coupling in both optical and charge-state transitions of the defect.
  arXiv  Detail & Related papers  (2020-07-28T18:00:00Z)
• Electrical Control of Coherent Spin Rotation of a Single-Spin Qubit [0.0]
  Nitrogen vacancy (NV) centers, optically-active atomic defects in diamond, have attracted tremendous interest for quantum sensing, network, and computing applications. Here, we report electrical control of the coherent spin rotation rate of a single-spin qubit in NV-magnet based hybrid quantum systems.
  arXiv  Detail & Related papers  (2020-07-15T08:39:37Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.