Identifying optimal magnetic field configurations for decoherence mitigation of boron vacancies in hexagonal boron nitride

• URL: http://arxiv.org/abs/2505.06574v2
• Date: Tue, 13 May 2025 11:39:13 GMT
• Title: Identifying optimal magnetic field configurations for decoherence mitigation of boron vacancies in hexagonal boron nitride
• Authors: Basanta Mistri, Saksham Mahajan, Felix Donaldson, Rama K. Kamineni, Siddharth Dhomkar,
• Abstract summary: boron vacancy center in 2D hexagonal boron nitride has emerged as a promising quantum sensor.<n>The nuclear spins, hyperfine coupled with the central electron spin, effectively behave as magnetic field fluctuators, leading to rapid decoherence.<n>Here, we explore the effectiveness of static magnetic field strength and orientation in realizing peculiar subspaces that can lead to enhanced spin coherence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The negatively charged boron vacancy center in 2D hexagonal boron nitride has emerged as a promising quantum sensor. However, its sensitivity is constrained due to ubiquitous nuclear spins in the environment. The nuclear spins, hyperfine coupled with the central electron spin, effectively behave as magnetic field fluctuators, leading to rapid decoherence. Here, we explore the effectiveness of static magnetic field strength and orientation in realizing peculiar subspaces that can lead to enhanced spin coherence. Specifically, using detailed numerical simulations of the spin Hamiltonian, we identify specific field configurations that minimize energy gradients and, consequently, are expected to facilitate decoherence suppression. We also develop an approximate analytical model based on the perturbation theory that accurately predicts these low-gradient subspaces for magnetic fields aligned with the electron spin quantization axis, applicable not only to boron vacancies but to any spin-1 electronic system coupled to nearby nuclear spins. Furthermore, to stimulate experimental validation, we estimate coherence lifetimes as a function of various bias field configurations and demonstrate that significant decoherence suppression can indeed be achieved in certain regions. These findings and the developed methodology offer valuable insights for mitigating decoherence in a low-field regime.

Related papers

• Spin manipulation and nuclear polarization enhancement in particle beams with static magnetic fields [0.0]
  A theoretical study of spin dynamics in non-relativistic particle beams with interacting angular momenta traversing static, spatially varying magnetic fields is presented.<n>It is demonstrated that such fields can effectively enhance nuclear polarization in partially, incoherently polarized hydrogen and deuterium atomic beams.
  arXiv  Detail & Related papers  (2025-05-18T10:59:33Z)
• Scanning spin probe based on magnonic vortex quantum cavities [0.0]
  We propose the realization of a nanoscale scanning electron paramagnetic resonance sensor using a vortex core in a thin-film disc. The vortex core can be displaced by using external magnetic fields of a few mT, enabling EPR scanning microscopy with large spatial resolution. Vortex nanocavities could also attain strong coupling to individual spin molecular qubits, with potential applications to mediate qubit-qubit interactions.
  arXiv  Detail & Related papers  (2024-01-12T12:53:49Z)
• Spin decoherence in VOPc@graphene nanoribbon complexes [5.691318972818067]
  Carbon nanoribbon or nanographene qubit arrays can facilitate quantum-to-quantum transduction between light, charge, and spin. We study spin decoherence due to coupling with a surrounding nuclear spin bath of an electronic molecular spin of a vanadyl phthalocyanine (VOPc) molecule integrated on an armchair-edged graphene nanoribbon (GNR) We find that the decoherence time $T$ is anisotropic with respect to magnetic field orientation and determined only by nuclear spins on VOPc and GNR.
  arXiv  Detail & Related papers  (2023-07-31T04:55:05Z)
• Quantum sensing via magnetic-noise-protected states in an electronic spin dyad [0.0]
  We investigate the coherent spin dynamics of a hetero-spin system formed by a spin S=1 featuring a non-zero crystal field. We show that the zero-quantum coherences we create between them can be remarkably long-lived. These spin dyads could be exploited as nanoscale gradiometers for precision magnetometry or as probes for magnetic-noise-free electrometry and thermal sensing.
  arXiv  Detail & Related papers  (2023-06-29T19:27:17Z)
• Control of an environmental spin defect beyond the coherence limit of a central spin [79.16635054977068]
  We present a scalable approach to increase the size of electronic-spin registers. We experimentally realize this approach to demonstrate the detection and coherent control of an unknown electronic spin outside the coherence limit of a central NV. Our work paves the way for engineering larger quantum spin registers with the potential to advance nanoscale sensing, enable correlated noise spectroscopy for error correction, and facilitate the realization of spin-chain quantum wires for quantum communication.
  arXiv  Detail & Related papers  (2023-06-29T17:55:16Z)
• Sensing of magnetic field effects in radical-pair reactions using a quantum sensor [50.591267188664666]
  Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades. We employ elaborate and realistic models of radical-pairs, considering its coupling to the local spin environment and the sensor. For two model systems, we derive signals of MFE detectable even in the weak coupling regime between radical-pair and NV quantum sensor.
  arXiv  Detail & Related papers  (2022-09-28T12:56:15Z)
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field [0.0]
  We show for the first time that the spin purity performs complex temporal oscillations. Our studies are essential for the design and optimization of quantum-dot-based entangled multi-photon sources.
  arXiv  Detail & Related papers  (2021-08-11T12:00:30Z)
• Quantum control of nuclear spin qubits in a rapidly rotating diamond [62.997667081978825]
  Nuclear spins in certain solids couple weakly to their environment, making them attractive candidates for quantum information processing and inertial sensing. We demonstrate optical nuclear spin polarization and rapid quantum control of nuclear spins in a diamond physically rotating at $1,$kHz, faster than the nuclear spin coherence time. Our work liberates a previously inaccessible degree of freedom of the NV nuclear spin, unlocking new approaches to quantum control and rotation sensing.
  arXiv  Detail & Related papers  (2021-07-27T03:39:36Z)
• 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)
• Controlled coherent dynamics of [VO(TPP)], a prototype molecular nuclear qudit with an electronic ancilla [50.002949299918136]
  We show that [VO(TPP)] (vanadyl tetraphenylporphyrinate) is a promising system suitable to implement quantum computation algorithms. It embeds an electronic spin 1/2 coupled through hyperfine interaction to a nuclear spin 7/2, both characterized by remarkable coherence.
  arXiv  Detail & Related papers  (2021-03-15T21:38:41Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• Spin emitters beyond the point dipole approximation in nanomagnonic cavities [0.0]
  Control over transition rates between spin states of emitters is crucial in a variety of fields ranging from quantum information science to the nanochemistry of free radicals. We present an approach to drive a both electric and magnetic dipole-forbidden transition of a spin emitter by placing it in a nanomagnonic cavity.
  arXiv  Detail & Related papers  (2020-12-08T19:00:02Z)
• 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)

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.