We show how one can make use of a wide range of quantum control methods to raise fidelities and robustness of two-qubit gates with trapped ions.
The paper was published on 27 September 2022 in Journal of Physics B: Atomic, Molecular and Optical Physics.

Manuscript: Quantum Control Methods for Robust Entanglement of Trapped Ions.

We have determined how a quantum computer could break the encryption of Bitcoin and simulate the FeMo-co molecule, a crucial molecule for Nitrogen fixation. We show that in certain situations, architectures with considerably slower code cycle times will still be able to reach desirable run times, provided enough physical qubits are available. Four years ago, we estimated that a trapped ion quantum computer would need a billion physical qubits to break RSA encryption equating to a size 100m2. With innovations across the board, the size of such a quantum computer would now just need to be 2.5m2.

The paper was published on 25 Jan 2022 in AVS Quantum Science.

Manuscript: The Impact of Hardware Specifications on Reaching Quantum Advantage in the Fault Tolerant Regime

Press release: Sussex Scientists Reveal how Quantum Computing can Break Bitcoin and Help Tackle World Hunger

We propose a new microwave gate which uses the intrinsic J-coupling of ions in a static magnetic gradient. The gate is virtually insensitive to common amplitude noise of the microwave fields and enables high fidelities despite qubit frequency fluctuations, while the J-coupling interaction’s inherent robustness to motional decoherence is retained. Errors far below the fault-tolerant threshold can be achieved at high initial temperatures, negating the requirement of sideband cooling below the Doppler temperature.

Manuscript : Robust Entanglement by Continuous Dynamical Decoupling of the J-Coupling Interaction

Microfabricated ion-trap devices offer a promising pathway towards scalable quantum computing. Addition of on-chip features, however, increases the power dissipated by components such as current-carrying wires and digital-to-analogue converters (DACs). Presented here is the development of a modular cooling system designed for use with multiple ion-trapping experiments simultaneously enabling efficient cooling to 70K while provide significant and scalable cooling power.

Manuscript: A Scalable Helium Gas Cooling System for Trapped-Ion Applications