Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Quantum information: Quantum computers and communication I
Q 59.2: Vortrag
Freitag, 21. März 2014, 10:45–11:00, DO26 207
High fidelity spin entanglement using optimal control — •Florian Dolde1, Ville Bergholm2, Ya Wang1, Ingmar Jakobi1, Boris Naydenov3, Sebastien Pezzagna4, Jan Meijer4, Fedor Jelezko3, Philipp Neumann1, Thomas Schulte-Herbrüggen5, Jacob Biamonte2, and Jörg Wrachtrup1 — 13rd Institute of Physics, University of Stuttgart, Germany — 2ISI Foundation, Torino, Italy — 3Institute for Physics, University of Ulm, Germany — 4Institute for Physics, University of Leipzig, Germany — 5Department of Chemistry, Technical University Munich, Germany
Precise control of quantum systems is of fundamental importance in quantum information processing, quantum metrology and high-resolution spectroscopy. When scaling up quantum registers, several challenges arise: individual addressing of qubits while suppressing crosstalk, entangling distant nodes, and decoupling unwanted interactions. We experimentally demonstrate optimal control of a prototype spin qubit system consisting of two proximal nitrogen-vacancy (NV) centers in diamond. Using engineered microwave pulses, we demonstrate single electron spin operations with a fidelity F ≈ 0.99. With additional dynamical decoupling techniques, we further realize high-quality, on-demand entangled states between two electron spins with F > 0.82, mostly limited by the coherence time and imperfect initialization. Finally, by high fidelity entanglement swapping to nuclear spin quantum memory, we demonstrate nuclear spin entanglement over a length scale of 25 nm.