Nuclear State Preparation via Landau-Zener-Stückelberg Transitions in Double Quantum Dots

Ribeiro, Hugo; Burkard, Guido

doi:10.1103/physrevlett.102.216802

Cited by 71 publications

(81 citation statements)

References 22 publications

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“…Although theoretical scenarios 91 have been proposed to explain such an effect 90 , it later turned out that another interpretation of the data is much more plausible 92 .…”

Section: Narrowing Of Nuclear Field Distribution Using 'Closed-loop' mentioning

confidence: 99%

Nuclear spin effects in semiconductor quantum dots

et al. 2013

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“…Although theoretical scenarios 91 have been proposed to explain such an effect 90 , it later turned out that another interpretation of the data is much more plausible 92 .…”

Section: Narrowing Of Nuclear Field Distribution Using 'Closed-loop' mentioning

confidence: 99%

Nuclear spin effects in semiconductor quantum dots

et al. 2013

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“…6(a)] the final one is (0,2)S ′ when the switching is fast on the τ S scale. The transition has then the Landau-Zener character [32][33][34][35] The charge occupation of the dots is left unchanged for the nonadiabatic abrupt switching. To be more precise, the abrupt potential change leaves a small admixture of (1,1)S state to (0,2)S ′ -which produces oscillations of the charge localized in the left dot in the limits that are marked in the upper panel of Fig.…”

Section: B the Spin Separation And Exchange Sequencementioning

confidence: 99%

Spin separation and exchange for quantum dots in the Overhauser field

Leśnicki

Szafran

2017

Phys. Rev. B

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We describe the spin and charge dynamics of the system of two electrons confined within a double quantum dot defined in a quantum wire. The spin dynamics is driven by the electron motion in presence of the spin-orbit interaction and the randomly varying local Overhauser field due to the nuclear spins. The Schroedinger equation is solved with the time-dependent configuration interaction method that allows for an exact description of the system dynamics. The procedures of the spin separation, exchange and read-out by the spin to charge conversion all induced by the detuning variation are simulated. The rates of the potential variation that are necessary for the spin separation and spin to charge conversion in the context of the Landau-Zener transitions are determined. The average over random configurations of the hyperfine field produce spin exchange results which qualitatively agree with the experimental data.

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“…This method articulates successive shifting of the magnetic field and radiofrequency pulses iteratively to transfer the spin polarization into a single nuclear state, similar to methods explored for optical quantum dots [33][34][35]. Unlike existing schemes at ∼500 and ∼1000 G axial magnetic fields for the excited state and ground-state level anticrossings (LACs), this approach relies on the control of weak magnetic fields and state-selective rf pulses.…”

Section: (A)mentioning

confidence: 99%

Diamond-nitrogen-vacancy electronic and nuclear spin-state anticrossings under weak transverse magnetic fields

et al. 2016

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We report on detailed studies of electronic and nuclear spin states in the diamond-nitrogen-vacancy (NV) center under weak transverse magnetic fields. We numerically predict and experimentally verify a previously unobserved NV hyperfine level anticrossing (LAC) occurring at bias fields of tens of gauss-two orders of magnitude lower than previously reported LACs at ∼500 and ∼1000 G axial magnetic fields. We then discuss how the NV ground-state Hamiltonian can be manipulated in this regime to tailor the NV's sensitivity to environmental factors and to map into the nuclear spin state. DOI: 10.1103/PhysRevA.94.021401 Nitrogen-vacancy (NV) defect centers in diamond are optically polarizable quantum systems with spin-dependent fluorescence. Using electron spin resonance (ESR) under ambient conditions, sensitivity to electric fields [1][2][3][4], transverse and axial magnetic fields [5][6][7][8][9][10], temperature [11][12][13][14], strain [15], and pressure [16] have been observed via resonance frequency shifts of the NV ground-state manifold. Nonseparable sensitivity to multiple environmental factors is problematic when it comes to using the NV as a sensor. However, the Hamiltonian governing the measurable frequency shifts can be tailored to enhance (or to suppress) sensitivity to different physical phenomena. A magnetic bias field applied parallel or perpendicular [B || or B ⊥ as shown in Fig. 1(a)] to the NV's axis in the diamond crystal lattice energetically separates the spin states and increases sensitivity to magnetic or electric fields, respectively.In this Rapid Communication, we investigate an unexplored weak-field regime in which electronic spin ground-state energy level splittings are on par with the Zeeman shift induced by an applied magnetic field. Here we account for both the electron and the nuclear spin of the NV, which reveals complex dynamics of nuclear spin state degeneracy and previously unobserved hyperfine level anticrossings. These features occur at a low magnetic field (B ⊥ 40 G) as compared to the B || ∼ 500 and B || ∼ 1000 G excited-and ground-state crossings [17][18][19][20], which have been used for nuclear spin polarization, providing increased sensitivity to resonance shifts through narrower effective linewidth and increased contrast [21][22][23][24]. We find excellent agreement between experiment and theory and discuss the utility of the nuclear spin degeneracy regime toward NV sensing applications and solid-state atomic memories based on nuclear spin polarization. While the results described here are specific to the NV, similar anticrossings are expected in any spin-1 (or higher) defect center that shows hyperfine level splitting on the same order of magnitude as double-electron spin flip anticrossings.The NV is a two-site defect with a spin-1 electronic ground state, which is magnetically coupled to nearby nuclear spins.For a single NV orientation, energy level shifts are described by the following spin Hamiltonian of the ground triplet state in the presence of magnetic, electric, ...

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Nuclear State Preparation via Landau-Zener-Stückelberg Transitions in Double Quantum Dots

Cited by 71 publications

References 22 publications

Nuclear spin effects in semiconductor quantum dots

Nuclear spin effects in semiconductor quantum dots

Spin separation and exchange for quantum dots in the Overhauser field

Diamond-nitrogen-vacancy electronic and nuclear spin-state anticrossings under weak transverse magnetic fields

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