W. A. Coish

14-Qubit Entanglement: Creation and Coherence

We report the creation of Greenberger-Horne-Zeilinger states with up to 14 qubits. By investigating the coherence of up to 8 ions over time, we observe a decay proportional to the square of the number of qubits. The observed decay agrees with a theoretical model which assumes a system affected by correlated, Gaussian phase noise. This model holds for the majority of current experimental systems developed towards quantum computation and quantum metrology.

Hyperfine interaction in a quantum dot : non-Markovian electron spin dynamics

We have performed a systematic calculation for the non-Markovian dynamics of a localized electron spin interacting with an environment of nuclear spins via the Fermi contact hyperfine interaction. This work applies to an electron in the

Recipes for spin-based quantum computing

s

Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot

-type orbital ground state of a quantum dot or bound to a donor impurity, and is valid for arbitrary polarization

Nuclear spin state narrowing via gate-controlled Rabi oscillations in a double quantum dot

p

Singlet-triplet decoherence due to nuclear spins in a double quantum dot

of the nuclear spin system, and arbitrary nuclear spin

Universal Phase Shift and Nonexponential Decay of Driven Single-Spin Oscillations

I

Pauli Spin Blockade in a Highly Tunable Silicon Double Quantum Dot

in high magnetic fields. In the limit of

Molecular States in Carbon Nanotube Double Quantum Dots

p=1

Spin interactions, relaxation and decoherence in quantum dots

and