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Spins in few-electron quantum dots
The canonical example of a quantum-mechanical two-level system is spin. The simplest picture of spin is a magnetic moment pointing up or down. The full quantum properties of spin become apparent in
Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres
The data imply statistically significant rejection of the local-realist null hypothesis and could be used for testing less-conventional theories, and for implementing device-independent quantum-secure communication and randomness certification.
Quantum internet: A vision for the road ahead
What it will take to achieve this so-called quantum internet is reviewed and different stages of development that each correspond to increasingly powerful applications are defined, including a full-blown quantum internet with functional quantum computers as nodes connected through quantum communication channels.
Heralded entanglement between solid-state qubits separated by three metres
Long-distance entanglement of two electron spin qubits in diamond with a spatial separation of three metres is established using a robust protocol based on creation of spin–photonEntanglement at each location and a subsequent joint measurement of the photons.
Universal Dynamical Decoupling of a Single Solid-State Spin from a Spin Bath
This work strongly suppressed the coupling of a single spin in diamond with the surrounding spin bath by using double-axis dynamical decoupling and preserved the coherence was preserved for arbitrary quantum states, as verified by quantum process tomography.
Single-shot read-out of an individual electron spin in a quantum dot
Electrical single-shot measurement of the state of an individual electron spin in a semiconductor quantum dot is demonstrated using spin-to-charge conversion of a single electron confined in the dot, and the single-electron charge is detected using a quantum point contact.
High-fidelity projective read-out of a solid-state spin quantum register
The preparation and measurement of a multi-spin quantum register in a low-temperature solid-state system is demonstrated by implementing resonant optical excitation techniques originally developed in atomic physics, and compatibility with qubit control is shown.
Deterministic delivery of remote entanglement on a quantum network
Remote deterministic spin–spin entanglement is achieved using nitrogen–vacancy centres in diamonds and a single-photon entangling protocol, with much improved entangling rates compared to previously used two- photon protocols.
Quantum technologies with optically interfaced solid-state spins
Spins of impurities in solids provide a unique architecture to realize quantum technologies. A quantum register of electron and nearby nuclear spins in the lattice encompasses high-fidelity state
Excited-state spectroscopy using single spin manipulation in diamond.
The data show that the spin level splitting can significantly differ between N-V centers, likely due to the effects of local strain, which provides a pathway to control over the spin Hamiltonian and may be useful for quantum-information processing.