We describe a new approach for trapped-ion quantum computing based on the application of global radiation fields and voltages applied to individual gate zones. Using this technique we demonstrate a two-qubit quantum gate producing a maximally entangled state with fidelity close to the fault-tolerant threshold. This quantum gate also constitutes a simple-to-implement tool for quantum metrology, sensing and simulation. (more…)
We demonstrate ground-state cooling of a trapped ion using long-wavelength radiation. This is a powerful tool for the implementation of quantum operations, where long-wavelength radiation instead of lasers is used for motional quantum state engineering.
Published in Physical Review Letters.
Manuscript: Ground-state cooling of a trapped ion using long-wavelength radiation
We propose a new quantum gate utilizing microwave radiation and dressed states that is highly robust to decoherence making it an attractive candidate for the implementation of high-fidelity microwave quantum logic. Published in the New Journal of Physics.
Manuscript: Multi-qubit gate with trapped ions for microwave and laser-based implementation
We have developed a new method to efficiently prepare dressed state qubits and qutrits, thereby significantly reducing the experimental complexity of gate operations with dressed-state qubits. Dressed states are well protected from noise making them ideal for use in many quantum technology applications. Published in Physical Review A and selected as ‘Editor’s Suggestion’.
We demonstrate spin-motion entanglement using longwave radiation. This is a critical step towards the experimental realisation of high-fidelity two-qubit gates using microwaves rather than laser radiation. Published in Physical Review A.
Manuscript: Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation
Demonstration of the first two-dimensional ion lattice integrated on a microchip. We realize a two-dimensional ion-trap lattice on a microchip using a new fabrication method that allows very-high voltages to be applied to the chip, enabling very deep ion traps. Published in Nature Communications.
Article on how to create optimal two-dimensional ion trap arrays for quantum simulation, published in New Journal of Physics (14 August 2012)
Manuscript: Optimisation of two-dimensional ion trap arrays for quantum simulation
Article on the application of radio-frequency voltages to ion traps via helical resonators, published in Apl. Phys. B (17 January 2012).
Manuscript: On the application of radio frequency voltages to ion traps via helical resonators
Article on the principles and operation of microfabricated ion traps including material considerations, a guide to the appropriate fabrication design, details of different fabrication processes and a summary of previously realized structures, published in Contemp. Phys. (14 Sept. 2011).
Article on how to create optimal electrode configurations for separation and trap depth in surface ion traps, published in Applied Physics B (28 Nov. 2011)
