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One-step generation of multipartite entanglement among nitrogen-vacancy center ensembles.

Song WL, Yin ZQ, Yang WL, Zhu XB, Zhou F, Feng M - Sci Rep (2015)

Bottom Line: Then the ECSs of the NVEs can be obtained by projecting the flux qubit, and the entanglement detection can be realized by transferring the quantum state from the NVEs to the flux qubit.Our numerical simulation shows that even under current experimental parameters the concurrence of the ECSs can approach unity.We emphasize that this method is straightforwardly extendable to the case of many NVEs.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China [2] University of the Chinese Academy of Sciences, Beijing 100049, China.

ABSTRACT
We describe a one-step, deterministic and scalable scheme for creating macroscopic arbitrary entangled coherent states (ECSs) of separate nitrogen-vacancy center ensembles (NVEs) that couple to a superconducting flux qubit. We discuss how to generate the entangled states between the flux qubit and two NVEs by the resonant driving. Then the ECSs of the NVEs can be obtained by projecting the flux qubit, and the entanglement detection can be realized by transferring the quantum state from the NVEs to the flux qubit. Our numerical simulation shows that even under current experimental parameters the concurrence of the ECSs can approach unity. We emphasize that this method is straightforwardly extendable to the case of many NVEs.

No MeSH data available.


Related in: MedlinePlus

The total photon number N in two NVEs as a function of the parameter Δ and the dimensionless time, where we set γ = Γ = 0.01, κ = 0.04, G1 = 1, and Ωd = 5.
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f4: The total photon number N in two NVEs as a function of the parameter Δ and the dimensionless time, where we set γ = Γ = 0.01, κ = 0.04, G1 = 1, and Ωd = 5.

Mentions: The condition on HP transformation for the NVEs requires that the total number of the excitations be much smaller than the number of the NV centers in each NVE. In our case, the average photon number in the two NVEs can be calculated as where ξ = e− γt + eγt − 2qP1P2 cos(Ωdt). Considering the case of G1 ≠ G2, we set G2 = (1 + Δ)G1. As shown in Fig. 4, we plot the total photon number N = N1 + N2 as a function of the parameter Δ and time. One can find that the value of N is smaller than 20. So the small excitation number ensures a reasonable HP transformation in our scheme.


One-step generation of multipartite entanglement among nitrogen-vacancy center ensembles.

Song WL, Yin ZQ, Yang WL, Zhu XB, Zhou F, Feng M - Sci Rep (2015)

The total photon number N in two NVEs as a function of the parameter Δ and the dimensionless time, where we set γ = Γ = 0.01, κ = 0.04, G1 = 1, and Ωd = 5.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4291559&req=5

f4: The total photon number N in two NVEs as a function of the parameter Δ and the dimensionless time, where we set γ = Γ = 0.01, κ = 0.04, G1 = 1, and Ωd = 5.
Mentions: The condition on HP transformation for the NVEs requires that the total number of the excitations be much smaller than the number of the NV centers in each NVE. In our case, the average photon number in the two NVEs can be calculated as where ξ = e− γt + eγt − 2qP1P2 cos(Ωdt). Considering the case of G1 ≠ G2, we set G2 = (1 + Δ)G1. As shown in Fig. 4, we plot the total photon number N = N1 + N2 as a function of the parameter Δ and time. One can find that the value of N is smaller than 20. So the small excitation number ensures a reasonable HP transformation in our scheme.

Bottom Line: Then the ECSs of the NVEs can be obtained by projecting the flux qubit, and the entanglement detection can be realized by transferring the quantum state from the NVEs to the flux qubit.Our numerical simulation shows that even under current experimental parameters the concurrence of the ECSs can approach unity.We emphasize that this method is straightforwardly extendable to the case of many NVEs.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China [2] University of the Chinese Academy of Sciences, Beijing 100049, China.

ABSTRACT
We describe a one-step, deterministic and scalable scheme for creating macroscopic arbitrary entangled coherent states (ECSs) of separate nitrogen-vacancy center ensembles (NVEs) that couple to a superconducting flux qubit. We discuss how to generate the entangled states between the flux qubit and two NVEs by the resonant driving. Then the ECSs of the NVEs can be obtained by projecting the flux qubit, and the entanglement detection can be realized by transferring the quantum state from the NVEs to the flux qubit. Our numerical simulation shows that even under current experimental parameters the concurrence of the ECSs can approach unity. We emphasize that this method is straightforwardly extendable to the case of many NVEs.

No MeSH data available.


Related in: MedlinePlus