We make use of a decoherence-free subspace with specifically designed entangled states to demonstrate precision spectroscopy of a pair of trapped Ca+ ions; we obtain the electric quadrupole moment, which is of use for frequency standard applications.
We report the scalable and deterministic generation of four-, five-, six-, seven- and eight-particle entangled states of the W type with trapped ions. We obtain the maximum possible information on these states by performing full characterization via state tomography, using individual control and detection of the ions.
For the first time, our team at the Institute for Experimentalphysik at Innsbruck University in collaboration with Daniel James from Los Alamos Laboratory in the USA succeeded at teleporting the quantum state of a trapped calcium ion to another calcium ion. This is the first time teleportation has been achieved with atomic particles, as opposed to beams of light, in an entirely deliberate, controllable manner.
Arbitrary atomic Bell states with two trapped ions are generated in a deterministic and preprogrammed way. The resulting entanglement is quantitatively analyzed using various measures of entanglement. For this, we reconstruct the density matrix using single qubit rotations and subsequent measurements with near-unity detection efficiency. This procedure represents the basic building block for future process tomography of quantum computations.
We report the deterministic creation of maximally entangled three-qubit states—specifically the Greenberger-Horne-Zeilinger (GHZ) state and the W state—with a trapped-ion quantum computer.
A Cirac-Zoller controlled-NOT quantum gate with two ions
Quantum Optics and Spectroscopy
Institut für Experimentalphysik
Universität Innsbruck
Technikerstrasse 25/4
A-6020 Innsbruck, Austria
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