Spatially-resolved decoherence of donor spins in silicon strained by a metallic electrode

• URL: http://arxiv.org/abs/2101.04391v1
• Date: Tue, 12 Jan 2021 10:32:01 GMT
• Title: Spatially-resolved decoherence of donor spins in silicon strained by a metallic electrode
• Authors: V. Ranjan, B. Albanese, E. Albertinale, E. Billaud, D. Flanigan, J. J. Pla, T. Schenkel, D. Vion, D. Esteve, E. Flurin, J. J. L. Morton, Y. M. Niquet, P. Bertet
• Abstract summary: We report a comprehensive study of the coherence of near-surface bismuth donor spins in 28-silicon at millikelvin temperatures. By measuring magnetic-field-insensitive clock transitions we separate magnetic noise caused by surface spins from charge noise. The interplay of these decoherence mechanisms for such near-surface electron spins is critical for their application in quantum technologies.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Electron spins are amongst the most coherent solid-state systems known, however, to be used in devices for quantum sensing and information processing applications, they must be typically placed near interfaces. Understanding and mitigating the impacts of such interfaces on the coherence and spectral properties of electron spins is critical to realize such applications, but is also challenging: inferring such data from single-spin studies requires many measurements to obtain meaningful results, while ensemble measurements typically give averaged results that hide critical information. Here, we report a comprehensive study of the coherence of near-surface bismuth donor spins in 28-silicon at millikelvin temperatures. In particular, we use strain-induced frequency shifts caused by a metallic electrode to make spatial maps of spin coherence as a function of depth and position relative to the electrode. By measuring magnetic-field-insensitive clock transitions we separate magnetic noise caused by surface spins from charge noise. Our results include quantitative models of the strain-split spin resonance spectra and extraction of paramagnetic impurity concentrations at the silicon surface. The interplay of these decoherence mechanisms for such near-surface electron spins is critical for their application in quantum technologies, while the combination of the strain splitting and clock transition extends the coherence lifetimes by up to two orders of magnitude, reaching up to 300 ms at a mean depth of only 100nm. The technique we introduce here to spatially map coherence in near-surface ensembles is directly applicable to other spin systems of active interest, such as defects in diamond, silicon carbide, and rare earth ions in optical crystals.

Related papers

• Decoherence induced by dipole-dipole couplings between atomic species in rare-earth ion-doped Y$_2$SiO$_5$ [0.0]
  We investigate the relationship between the magnetic field parameters and the decoherence caused by magnetic dipole-dipole coupling. This work allows us to pinpoint the most relevant decoherence mechanisms in the considered magnetic field regime.
  arXiv  Detail & Related papers  (2024-08-04T08:26:03Z)
• Spin Resonance Spectroscopy with an Electron Microscope [0.0]
  We propose a pump-probe spin resonance spectroscopy approach, based on microwave pump fields and electron probes. We investigate how quantum spin systems couple to electron matter waves through their magnetic moments. This could enable state-selective observation of spin dynamics on the nanoscale and indirect measurement of the environment of the examined spin systems.
  arXiv  Detail & Related papers  (2024-01-12T10:42:47Z)
• 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)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• 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)
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
  Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
  arXiv  Detail & Related papers  (2021-05-16T06:15:00Z)
• 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)
• Anisotropic Spin-Acoustic Resonance in Silicon Carbide at Room Temperature [0.0]
  We report on acoustically driven spin resonances in atomic-scale centers in silicon carbide at room temperature. Results establish silicon carbide as a highly-promising hybrid platform for on-chip spin-optomechanical quantum control.
  arXiv  Detail & Related papers  (2020-05-02T10:51:50Z)
• Optically pumped spin polarization as a probe of many-body thermalization [50.591267188664666]
  We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength. Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
  arXiv  Detail & Related papers  (2020-05-01T23:16:33Z)

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.