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FM: Fall Meeting
FM 78: Quantum Computation: Hardware Platform III
FM 78.2: Talk
Donnerstag, 26. September 2019, 14:30–14:45, 1199
Local entangling operations on two arbitrary ions in a string of ions — •Michael Meth1, Marc Bußjäger1, Alexander Erhard1, Lukas Postler1, Roman Stricker1, Martin Ringbauer1, Thomas Monz1, 2, and Rainer Blatt1, 3 — 1Universität Innsbruck, Institut für Experimentalphysik, Technikerstraße 25, Innsbruck — 2Alpine Quantum Technologies GmbH — 3Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences
We present a scheme for local entangling operations on two arbitrary ions in a string of currently up to 16 ions. Two acousto-optic deflectors are used to address a single or multiple ions at once, performing parallel quantum gate operations on several quantum bits (qubits) with independent phase control. The deflectors are aligned such that induced frequency shifts are cancelled along the trap axis regardless of the addressed ions. Mølmer-Sørensen (MS) gates are implemented to create entanglement between two arbitrary qubits via coupling to the common motion of the ion string. In conjunction with single qubit gates a universal set of gates is formed. For an arbitrary set of two ions in a string of four the entangling gate fidelities are measured to be comparable with collective MS gates on all qubits and no significant loss in performance has been observed for longer strings. This method can be extended from two qubits to subsets of arbitrary lengths. Simulations of improved optical setups show an addressable range of several hundreds of micrometers, which corresponds to more than 50 qubits.