Experimental and Theoretical Analysis of Noise Strength and Environmental Correlation Time for Ensembles of Nitrogen-Vacancy Centers in Diamond

Hayashi, Kazushi; Matsuzaki, Yuichiro; Ashida, Takaki; Onoda, Shinobu; Abe, Hiroshi; Ohshima, Takeshi; Hatano, Mutsuko; Taniguchi, Takashi; Morishita, Hiroki; Fujiwara, Masanori; Mizuochi, Norikazu

doi:10.7566/jpsj.89.054708

Cited by 19 publications

(13 citation statements)

References 60 publications

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“…Secondly, we characterize samples by measuring and analyzing dynamics of NV ensembles by using relaxometry measurements: longitudinal (spin-lattice) relaxation time T 1 that characterizes NV spin ensemble dephasing mainly due to cross-relaxation within the strongly interacting bath of NV − spins [49,50]; the transverse relaxation time T 2 that characterizes homogeneous decoherence of the prepared state of the NV ensemble, and are mainly caused by the interaction of NV − with the spin bath of substitutional nitrogen atoms (P1 centers) [49,51]. For a detailed description and explanation of these relaxometry measurement sequences, see references [2,8,10].…”

Section: Relaxation Measurementsmentioning

confidence: 99%

Impact of Helium Ion Implantation Dose and Annealing on Dense Near-Surface Layers of NV Centers

et al. 2022

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The implantation of diamonds with helium ions has become a common method to create hundreds-nanometers-thick near-surface layers of NV centers for high-sensitivity sensing and imaging applications; however, optimal implantation dose and annealing temperature are still a matter of discussion. In this study, we irradiated HPHT diamonds with an initial nitrogen concentration of 100 ppm using different implantation doses of helium ions to create 200-nm thick NV layers. We compare a previously considered optimal implantation dose of ∼1012 He+/cm2 to double and triple doses by measuring fluorescence intensity, contrast, and linewidth of magnetic resonances, as well as longitudinal and transversal relaxation times T1 and T2. From these direct measurements, we also estimate concentrations of P1 and NV centers. In addition, we compare the three diamond samples that underwent three consequent annealing steps to quantify the impact of processing at 1100 ∘C, which follows initial annealing at 800 ∘C. By tripling the implantation dose, we have increased the magnetic sensitivity of our sensors by 28±5%. By projecting our results to higher implantation doses, we demonstrate that it is possible to achieve a further improvement of up to 70%. At the same time, additional annealing steps at 1100 ∘C improve the sensitivity only by 6.6 ± 2.7%.

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Section: Relaxation Measurementsmentioning

confidence: 99%

Impact of Helium Ion Implantation Dose and Annealing on Dense Near-Surface Layers of NV Centers

et al. 2022

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“…where γ denotes a decoherence rate and Lj denotes a lindblad operator at the j-site. Throughout of this paper, we use Lj = Ŝ(j) z , which corresponds to magnetic field noise that is typical for the NV centers [57][58][59][60]. We define a fidelity as F = GHZ + |ρ(t)|GHZ + .…”

Section: Numerical Simulations To Generate Ghz States With Bifurcatio...mentioning

confidence: 99%

Generation of multipartite entanglement between spin-1 particles with bifurcation-based quantum annealing

Matsuzaki¹,

Imoto²,

Susa³

2022

Preprint

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Quantum annealing is a way to solve a combinational optimization problem where quantum fluctuation is induced by transverse fields. Recently, a bifurcation-based quantum annealing with spin-1 particles was suggested as another mechanism to implement the quantum annealing. In the bifurcation-based quantum annealing, each spin is initially prepared in |0 , let this state evolve by a time-dependent Hamiltonian in an adiabatic way, and we find a state spanned by | ± 1 at the end of the evolution. Here, we propose a scheme to generate multipartite entanglement, namely GHZ states, between spin-1 particles by using the bifurcation-based quantum annealing. We gradually decrease the detuning of the spin-1 particles while we adiabatically change the amplitude of the external driving fields. Due to the dipole-dipole interactions between the spin-1 particles, we can prepare the GHZ state after performing this protocol. We discuss possible implementations of our scheme by using nitrogen vacancy centers in diamond.

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“…where γ denotes a decoherence rate and L j denotes a lindblad operator at the j-site. Throughout of this paper, we use L j = Ŝ( j) z , which corresponds to magnetic field noise that is typical for the NV centers [57][58][59][60] . We define a fidelity as F = ⟨GHZ + |ρ(t)|GHZ + ⟩.…”

Section: Numerical Simulations To Generate Ghz States With Bifurcatio...mentioning

confidence: 99%

Generation of Multipartite Entanglement Between Spin-1 Particles With Bifurcation-based Quantum Annealing

Matsuzaki

Imoto

Susa

2022

Preprint

Self Cite

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Quantum annealing is a way to solve a combinational optimization problem where quantum fluctuation is induced by transverse fields. Recently, a bifurcation-based quantum annealing with spin-1 particles was suggested as another mechanism to implement the quantum annealing. In the bifurcation-based quantum annealing, each spin is initially prepared in |0⟩, let this state evolve by a time-dependent Hamiltonian in an adiabatic way, and we find a state spanned by | ± 1⟩ at the end of the evolution. Here, we propose a scheme to generate multipartite entanglement, namely GHZ states, between spin-1 particles by using the bifurcation-based quantum annealing. We gradually decrease the detuning of the spin-1 particles while we adiabatically change the amplitude of the external driving fields. Due to the dipole-dipole interactions between the spin-1 particles, we can prepare the GHZ state after performing this protocol. We discuss possible implementations of our scheme by using nitrogen vacancy centers in diamond.

show abstract

Experimental and Theoretical Analysis of Noise Strength and Environmental Correlation Time for Ensembles of Nitrogen-Vacancy Centers in Diamond

Cited by 19 publications

References 60 publications

Impact of Helium Ion Implantation Dose and Annealing on Dense Near-Surface Layers of NV Centers

Impact of Helium Ion Implantation Dose and Annealing on Dense Near-Surface Layers of NV Centers

Generation of multipartite entanglement between spin-1 particles with bifurcation-based quantum annealing

Generation of Multipartite Entanglement Between Spin-1 Particles With Bifurcation-based Quantum Annealing

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