Multipartite Entanglement Among Single Spins in Diamond

  title={Multipartite Entanglement Among Single Spins in Diamond},
  author={Philipp Neumann and Norikazu Mizuochi and Florian Rempp and Philip Robert Hemmer and Hikaru Watanabe and Satoshi Yamasaki and Vincent Jacques and Torsten Gaebel and Fedor Jelezko and J{\"o}rg Wrachtrup},
  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… 

Quantum-memory-assisted entropic uncertainty relation with a single nitrogen-vacancy center in diamond

The limitation of simultaneous measurements of noncommuting observables can be eliminated when the measured particle is maximally entangled with a quantum memory. We present a proposal for testing

Entangling two spin ensembles in diamond nanostructures via a superconducting flux qubit

Entanglement between macroscopic systems is a basic resource for many quantum information processing, and so it is crucially important to investigate the possibility of achieving entanglement between

Room-temperature entanglement between single defect spins in diamond

Entanglement is the central yet fleeting phenomenon of quantum physics. Once being considered a peculiar counter-intuitive property of quantum theory1, it has developed into the most central element

Quantum register based on coupled electron spins in a room-temperature solid.

Nitrogen–vacancy centres in diamond have emerged as a promising platform for quantum information processing at room temperature. Now, coherent coupling between two electron spins separated by almost

Efficient entanglement purification of separate nitrogen-vacancy centers via coupling to microtoroidal resonators

We investigate a candidate for the potential implementation of entanglement purification of two entangled nitrogen vacancy (N-V) centers that are coupled with two microtoroidal resonators. In our

A pr 2 02 1 Decoherence-free quantum register of nuclear spins in diamond

Solid-state quantum registers are exceptional for storing quantum information at room temperature with long coherence time. Nevertheless, practical applications toward quantum supremacy require even

Decoherence-protected quantum register of nuclear spins in diamond

Solid-state quantum registers are exceptional for storing quantum information at room temperature with long coherence time. Nevertheless, practical applications toward quantum supremacy require even

Long-Lived Entanglement Generation of Nuclear Spins Using Coherent Light.

A mechanism for entangling two such distant macroscopic ensembles by using coherent light input is developed and the interaction between the light and the noble-gas spins in each ensemble is mediated by spin-exchange collisions with alkali-metal spins.

Comment on "Multipartite Entanglement Among Single Spins in Diamond"

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.

Performance of quantum registers in diamond in the presence of spin impurities

The Nitrogen Vacancy Center in diamond coupled to addressable surrounding nuclear spins forms a versatile building block for future quantum technologies. While previous activities focused on sensing



Room-temperature coherent coupling of single spins in diamond

Coherent coupling between single quantum objects is at the very heart of modern quantum physics. When the coupling is strong enough to prevail over decoherence, it can be used to engineer quantum

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

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.

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

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

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.

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

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.

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.