Magnetic tuning of tunnel coupling between InAsP double quantum dots in InP nanowires

• URL: http://arxiv.org/abs/2103.07819v5
• Date: Sun, 14 Nov 2021 16:47:45 GMT
• Title: Magnetic tuning of tunnel coupling between InAsP double quantum dots in InP nanowires
• Authors: Jason Phoenix, Marek Korkusinski, Dan Dalacu, Philip J. Poole, Piotr Zawadzki, Sergei Studenikin, Robin L. Williams, Andrew S. Sachrajda and Louis Gaudreau
• Abstract summary: We study the in-plane magnetic field dependence of the coupling between dots forming a vertically stacked double dot molecule. For specific geometries, we show that the interdot coupling can be controlled in-situ using a magnetic field-mediated redistribution of interdot coupling strengths.
• Score: 0.33727511459109766
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study experimentally and theoretically the in-plane magnetic field dependence of the coupling between dots forming a vertically stacked double dot molecule. The InAsP molecule is grown epitaxially in an InP nanowire and interrogated optically at millikelvin temperatures. The strength of interdot tunneling, leading to the formation of the bonding-antibonding pair of molecular orbitals, is investigated by adjusting the sample geometry. For specific geometries, we show that the interdot coupling can be controlled in-situ using a magnetic field-mediated redistribution of interdot coupling strengths. This is an important milestone in the development of qubits required in future quantum information technologies.

Related papers

• Detecting Strain Effects due to Nanobubbles in Graphene Mach-Zehnder Interferometers [0.0]
  We investigate the effect of elastic strain on a Mach-Zehnder interferometer created by graphene p-n junction in quantum Hall regime. A nanobubble causes detuning of conductance oscillations due to the strain-induced pseudo-magnetic fields. Our findings suggest the potential of using graphene as a strain sensor for developments in graphene-based device fabrications and measurements technologies.
  arXiv  Detail & Related papers  (2023-08-23T06:52:07Z)
• 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)
• Magnetic-field-induced cavity protection for intersubband polaritons [52.77024349608834]
  We analyse the effect of a strong perpendicular magnetic field on an intersubband transition in a disordered doped quantum well strongly coupled to an optical cavity. The magnetic field changes the lineshape of the intersubband optical transition due to the roughness of the interface of the quantum well from a Lorentzian to a Gaussian one.
  arXiv  Detail & Related papers  (2022-10-14T18:00:03Z)
• Study of the transition from resonance to bound states in quantum dots embedded on a nanowire using the $\mathbf{k}\cdot\mathbf{p}$ method [0.0]
  We study the band structure of semiconductor nanowires with quantum dots embedded in them. The band structure is calculated using the Rayleigh-Ritz variational method.
  arXiv  Detail & Related papers  (2022-07-11T21:47:32Z)
• First- and second-order gradient couplings to NV centers engineered by the geometric symmetry [21.439773541873535]
  nanowires with different geometries can induce a tunable magnetic field gradient because of their geometric symmetries. A straight nanowire can guarantee the Jaynes-Cummings (JC) spin-phonon interaction and may indicate a potential route towards the application on quantum measurement.
  arXiv  Detail & Related papers  (2022-04-11T02:40:57Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Long range magnetic dipole-dipole interaction mediated by a superconductor [0.0]
  Quantum computation and simulation requires strong coherent coupling between qubits, which may be spatially separated. Here we theoretically investigate a method for achieving such coupling, based on superconducting nano-structures designed to channel the magnetic flux created by the qubits. We show that such structures could channel the magnetic flux, enhancing the dipole-dipole interaction between spin qubits and changing its scaling with distance, thus potentially paving the way for controllably engineering an interacting spin system.
  arXiv  Detail & Related papers  (2021-07-11T21:16:29Z)
• Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules [60.17174832243075]
  We study the electronic and ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by applying state-of-the-art relativistic methods. We were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic potentials dissociating to two ground-state atoms.
  arXiv  Detail & Related papers  (2021-07-06T15:34:00Z)
• 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)
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions [57.50861918173065]
  Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
  arXiv  Detail & Related papers  (2020-05-03T09:27:31Z)

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.