Emily Crozier – Ion Quantum Technology Group

In-vacuum surface flashover of SiN, AlN, and etched SiO2 thin films at micrometre scales

Emily Crozier — Mon, 13 Apr 2026 10:39:41 +0000

We have discovered dielectric materials that enable the application of much larger voltages appliedto what was possible before and as such constitute an important breakthrough for the construction of a new generation of trapped-ion quantum computers. The new materials will enable storing quantum bits on the chip for much longer.

Manuscript: In-vacuum surface flashover of SiN, AlN, and etched SiO2 thin films at micrometre scales.

Fast-response low power atomic oven for integration into an ion microchip

Emily Crozier — Mon, 30 Jun 2025 10:05:34 +0000

The paper was published on 30 June 2025 in Applied Physics Letters and it was selected to be featured on the cover page of the journal.

Manuscript: Fast-response low power atomic oven for integration into an ion microchip.

Ultrasensitive Single-ion Electrometry in a Magnetic Field Gradient

Emily Crozier — Thu, 12 Jun 2025 11:25:04 +0000

We amplify the coupling between electric field perturbations and the spin states by using a static magnetic field gradient. Displacements of the trapped ion resulting from the forces experienced by an applied external electric field perturbation are thereby mapped to an instantaneous change in the energy level splitting of the internal spin states. We demonstrate unprecedented electric field sensitivities for the measurement of both DC signals and AC signals across a frequency range of sub-Hz to ∼ 500 kHz. Finally, we describe a set of hardware modifications that are capable of achieving a further improvement in sensitivity by up to six orders of magnitude.

The paper was published on 11 June 2025 in Nature Physics.
Manuscript: Ultrasensitive Single-ion Electrometry in a Magnetic Field Gradient.

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Fast-response low power atomic oven for integration into an ion microchip

Emily Crozier — Fri, 25 Apr 2025 14:02:50 +0000

We demonstrate the creation of microfabricated oven for ion traps, capable of loading two orders of magnitude faster than conventional overs while dissipating two orders of magnitude less power compared to conventional atomic ovens used in ion trapping.

Manuscript: Fast-response low power atomic oven for integration into an ion microchip.

Universities of �鶹ӳ�� and Bristol jointly launch £24m doctoral training centre

Emily Crozier — Wed, 13 Mar 2024 15:22:09 +0000

The �鶹ӳ��, in partnership with the University of Bristol, has announced that it is to receive millions in funding to launch a brand new quantum technologies Centre for Doctoral Training (CDT). ��The Centre for Doctoral Training in Quantum Information Science and Technologies was one of 65 new CDTs announced yesterday (Tuesday 12 March) by the Science and Technology Secretary, Michelle Donelan. ��

It will receive��£24 million of funding via the government’s Engineering and Physical Sciences Research Council (EPSRC), industry and other government organisations,��as part of wider work to support leading research in areas the government has designated of national importance.��

Universities of �鶹ӳ�� and Bristol launch £24m doctoral training centre to develop future leaders in quantum tech

BBC Breakfast: Making quantum computers modular

Emily Crozier — Mon, 13 Nov 2023 15:01:10 +0000

Researchers from the �鶹ӳ�� and Universal Quantum have demonstrated for the first time that quantum bits (qubits) can directly transfer between quantum computer microchips and demonstrated this with record-breaking speed and accuracy. This breakthrough resolves a major challenge in building quantum computers large and powerful enough to tackle complex problems that are of critical importance to society.

Quantum Control Methods for Robust Entanglement of Trapped Ions

Emily Crozier — Thu, 16 Jun 2022 15:57:11 +0000

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.

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

Emily Crozier — Tue, 29 Mar 2022 15:12:35 +0000

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. Published on 8 February in Nature Communications.

�鶹ӳ�� Press Release

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

Emily Crozier — Fri, 28 Jan 2022 12:00:02 +0000

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: �鶹ӳ�� Scientists Reveal how Quantum Computing can Break Bitcoin and Help Tackle World Hunger

The future of quantum computing in academia and industry

Emily Crozier — Wed, 01 Sep 2021 15:52:30 +0000

Professor Winfried Hensinger presented his personal journey spanning three continents and four countries, in a bid to achieve his goal of building a scalable quantum computer. He discussed the future of quantum computing and quantum technologies in academia and��industry at the online event on 3 June 2021, organised by the University of Bristol Quantum Engineering Centre for Doctoral Training. You can watch the advice he gave .