Efficient Qubit Routing for a Globally Connected Trapped Ion Quantum Computer

By |2020-09-03T14:33:50+01:00February 28th, 2020|

The cost of enabling connectivity in Noisy-Intermediate-Scale-Quantum devices is an important factor in determining computational power. A particular architecture for trapped-ion quantum computing relies on shuttling ions. An efficient ion routing algorithm has been created along with an appropriate error model, which can be used to estimate the achievable circuit depth and quantum volume as a function of experimental parameters.

Our paper has been published in Advanced Quantum Technologies 3, June 2020 Efficient Qubit routing for a globally connected trapped ion quantum computer

University of Sussex Research News press release, August 2020 Sussex study enables predicting computational power of early quantum computers

Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features

By |2020-06-05T16:31:38+01:00July 1st, 2019|

Ion trap microchips form the core of many quantum technologies, in particular, the trapped ion quantum computers. We provide an overview of state-of-the-art microfabrication techniques, as well as various considerations which motivate the choice of materials and processes. Finally, we discuss current efforts to include advanced, on-chip features into next generation ion traps. Our paper has been published in Nature Review Physics, June 2020.

Manuscript: Engineering of Microfabricated Ion Traps and Integration of Advanced On-Chip Features

Generation of high-fidelity quantum control methods for multi-level systems

By |2020-02-25T08:27:20+00:00October 1st, 2018|

We introduce a powerful technique to transform all existing two-level quantum control methods to new multi-level quantum control methods. We illustrate the technique by coherently mapping between two different qubit types with error well below the relevant fault-tolerant threshold, creating another important tool towards constructing a large scale quantum computer. (more…)

Blueprint for a microwave trapped-ion quantum computer

By |2020-02-25T08:27:53+00:00February 1st, 2017|

We unveil the first industrial blueprint on how to build a large-scale quantum computer. The work features a new invention permitting actual quantum bits to be transmitted between individual quantum computing modules in order to obtain a fully modular large-scale machine. The work is published in Science Advances. (more…)

Trapped-ion quantum logic with global radiation fields

By |2020-02-25T08:28:30+00:00November 1st, 2016|

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…)

Ground-state cooling of a trapped ion using long-wavelength radiation

By |2020-02-21T09:07:58+00:00July 1st, 2015|

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

University of Sussex Press Release

Multi-qubit gate with trapped ions for microwave and laser-based implementation

By |2020-02-21T09:09:41+00:00April 1st, 2015|

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

Efficient preparation and detection of microwave dressed-state qubits and qutrits with trapped ions

By |2020-02-21T09:12:14+00:00January 12th, 2015|

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’.

Manuscript: Efficient preparation and detection of microwave dressed-state qubits and qutrits with trapped ions

Generation of spin-motion entanglement in a trapped ion using long-wavelength radiation

By |2020-02-21T09:11:18+00:00January 10th, 2015|

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

University of Sussex Press Release