Multipartite Entanglement Among Single Spins in Diamond

@article{Neumann2008MultipartiteEA,
  title={Multipartite Entanglement Among Single Spins in Diamond},
  author={Philipp Neumann and Norikazu Mizuochi and Florian Rempp and Philip Robert Hemmer and H. Watanabe and Satoshi Yamasaki and Vincent Jacques and Torsten Gaebel and Fedor Jelezko and J{\"o}rg Wrachtrup},
  journal={Science},
  year={2008},
  volume={320},
  pages={1326 - 1329}
}
Robust entanglement at room temperature is a necessary requirement for practical applications in quantum technology. We demonstrate the creation of bipartite- and tripartite-entangled quantum states in a small quantum register consisting of individual 13C nuclei in a diamond lattice. Individual nuclear spins are controlled via their hyperfine coupling to a single electron at a nitrogen-vacancy defect center. Quantum correlations are of high quality and persist on a millisecond time scale even… 

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Two of the system's nuclear eigenstates are incorrectly described as product states when they are inherently entangled, and three of the six states reported, namely the odd-parity Bell states and the W state, were not actually produced.

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References

SHOWING 1-10 OF 32 REFERENCES

Observation of coherent oscillation of a single nuclear spin and realization of a two-qubit conditional quantum gate.

TLDR
Density matrix tomography of the CROT gate shows that the gate fidelity achieved in the experiments is up to 0.9, good enough to be used in quantum algorithms.

Observation of entanglement of a single photon with a trapped atom.

TLDR
The detection efficiency and the entanglement fidelity are high enough to allow in a next step the generation of entangled atoms at large distances, ready for a final loophole-free Bell experiment.

Measurement of the Entanglement of Two Superconducting Qubits via State Tomography

TLDR
A high degree of unitary control of the system is demonstrated, indicating that larger implementations are within reach of entanglement between two solid-state qubits.

Quantum Register Based on Individual Electronic and Nuclear Spin Qubits in Diamond

TLDR
Using optical and microwave radiation to control an electron spin associated with the nitrogen vacancy color center in diamond, robust initialization of electron and nuclear spin quantum bits (qubits) and transfer of arbitrary quantum states between them at room temperature are demonstrated.

Fault-tolerant quantum communication based on solid-state photon emitters.

TLDR
A novel protocol for a quantum repeater that enables long-distance quantum communication through realistic, lossy photonic channels by incorporating active purification of arbitrary errors at each step of the protocol using only two qubits at each repeater station.

Efficient high-fidelity quantum computation using matter qubits and linear optics

We propose a practical, scalable, and efficient scheme for quantum computation using spatially separated matter qubits and single-photon interference effects. The qubit systems can be

Coherent Dynamics of Coupled Electron and Nuclear Spin Qubits in Diamond

TLDR
Coherent manipulation of an individual electron spin associated with a nitrogen-vacancy center in diamond was used to gain insight into its local environment, which shows that this environment is effectively separated into a set of individual proximal 13Cnuclear spins, which are coupled coherently to the electron spin, and the remainder of the 13C nuclear spins, who cause the loss of coherence.

Quantum computation using the 13C nuclear spins near the single NV defect center in diamond

We discuss the possibility of realizing quantum computation on the basis of a cluster of single interacting nuclear spins in solids. This idea seems to be feasible because of the combination of two

Bell states of atoms with ultralong lifetimes and their tomographic state analysis.

TLDR
This work reconstructs the density matrix of arbitrary atomic Bell states with two trapped ions using single qubit rotations and subsequent measurements with near-unity detection efficiency, and investigates the temporal decay of entanglement.

Entanglement between an electron and a nuclear spin 1/2.

We report on the preparation and detection of entangled states between an electron spin 1/2 and a nuclear spin 1/2 in a molecular single crystal. These were created by applying pulses at ESR (9.5