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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

Top: Density plot of the concurrence of the ECS versus the dimensionless parameters Γ and t, where γ = 0.01. Middle: Density plot of the concurrence of the ECS versus the dimensionless parameters γ and t, where Γ = 0.01. Bottom: Concurrence of the ECS versus the dimensionless time t, where the solid, dashed, and dotted lines denote Γ = γ = 0, Γ = γ/10 = 0.001, and Γ = γ = 0.01, respectively. Here we have used the method in54 to calculate the concurrence in the case of Γ = γ = 0. Ωd = 15 and G1 = G2 = 1 are assumed in all panels.
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f2: Top: Density plot of the concurrence of the ECS versus the dimensionless parameters Γ and t, where γ = 0.01. Middle: Density plot of the concurrence of the ECS versus the dimensionless parameters γ and t, where Γ = 0.01. Bottom: Concurrence of the ECS versus the dimensionless time t, where the solid, dashed, and dotted lines denote Γ = γ = 0, Γ = γ/10 = 0.001, and Γ = γ = 0.01, respectively. Here we have used the method in54 to calculate the concurrence in the case of Γ = γ = 0. Ωd = 15 and G1 = G2 = 1 are assumed in all panels.

Mentions: To visualize the decoherence effect on the evolution of concurrence between the NVEs, we have plotted the time-dependent C12(t) in Fig. 2. Due to the presence of decoherence, the concurrence increases first and then decreases gradually to zero. So to carry out our scheme more efficiently, we have to suppress these imperfect factors as much as we can. On the other hand, the concurrence keeps to be of very high values (≥ 0.95) under the decoherence as long as the time is evaluated within the domain [2/G, 2.5/G], and the maximal entanglement () can be obtained if the operation time . We emphasize that a stronger decoherence only slightly reduces the maximal value of the concurrence, as shown in the bottom panel of Fig. 2.


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)

Top: Density plot of the concurrence of the ECS versus the dimensionless parameters Γ and t, where γ = 0.01. Middle: Density plot of the concurrence of the ECS versus the dimensionless parameters γ and t, where Γ = 0.01. Bottom: Concurrence of the ECS versus the dimensionless time t, where the solid, dashed, and dotted lines denote Γ = γ = 0, Γ = γ/10 = 0.001, and Γ = γ = 0.01, respectively. Here we have used the method in54 to calculate the concurrence in the case of Γ = γ = 0. Ωd = 15 and G1 = G2 = 1 are assumed in all panels.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: Top: Density plot of the concurrence of the ECS versus the dimensionless parameters Γ and t, where γ = 0.01. Middle: Density plot of the concurrence of the ECS versus the dimensionless parameters γ and t, where Γ = 0.01. Bottom: Concurrence of the ECS versus the dimensionless time t, where the solid, dashed, and dotted lines denote Γ = γ = 0, Γ = γ/10 = 0.001, and Γ = γ = 0.01, respectively. Here we have used the method in54 to calculate the concurrence in the case of Γ = γ = 0. Ωd = 15 and G1 = G2 = 1 are assumed in all panels.
Mentions: To visualize the decoherence effect on the evolution of concurrence between the NVEs, we have plotted the time-dependent C12(t) in Fig. 2. Due to the presence of decoherence, the concurrence increases first and then decreases gradually to zero. So to carry out our scheme more efficiently, we have to suppress these imperfect factors as much as we can. On the other hand, the concurrence keeps to be of very high values (≥ 0.95) under the decoherence as long as the time is evaluated within the domain [2/G, 2.5/G], and the maximal entanglement () can be obtained if the operation time . We emphasize that a stronger decoherence only slightly reduces the maximal value of the concurrence, as shown in the bottom panel of Fig. 2.

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