A High-Fidelity Quantum Matter-Link Between Ion-Trap Microchip Modules

By |2023-01-24T15:17:19+00:00March 29th, 2022|

We present the demonstration of a quantum matter-link in which ion qubits are transferred between adjacent QC modules. Ion transport between adjacent modules is realised at a rate of 2424 1/s and with an ion-transfer fidelity in excess of 99.999993%. Furthermore, we show that the link does not measurably impact the phase coherence of the qubit. The realisation of the quantum matter-link demonstrates a novel mechanism for interconnecting quantum computing modules. This achieves a key milestone for the implementation of modular quantum computers capable of hosting millions of qubits.

Manuscript: A High-Fidelity Quantum Matter-Link Between Ion-Trap Microchip Modules

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

By |2022-01-28T12:00:02+00:00January 28th, 2022|

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

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

By |2021-11-12T16:11:51+00:00July 15th, 2021|

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

A Scalable Helium Gas Cooling System for Trapped-Ion Applications

By |2022-03-29T16:14:02+01:00June 15th, 2021|

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

 

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…)