![]() Recently, the possibilities of manipulating materials by light have been greatly expanded by the demonstration of mode-selective optical control, whereby pumping a single infrared-active phonon mode results in a structural/electronic distortion along the coordinates of a second, anharmonically coupled Raman mode – a mechanism that was termed ‘nonlinear phononics’. More radically, it has been shown that fundamental materials properties such as superconductivity can be ‘switched on’ transiently under intense illumination. ![]() One promising field of research, known as femto-magnetism, has developed from the early demonstration that magnetic ‘bits’ in certain materials can be ‘written’ at ultra-fast speeds with light in the visible or IR range. The use of light to control the structural, electronic and magnetic properties of solids is emerging as one of the most exciting areas of condensed matter physics. Andrea Cavalleri, who holds a joint appointment between the Clarendon Laboratory and the Max Planck Institute for the Structure and Dynamics of Matter, (Hamburg). Professor Andrea Cavalleri and Professor Paolo RadaelliĪ collaboration between Prof. sophisticated classical control techniques to precisely control the optical interaction phase of multi-qubit register.building a new apparatus optimised for high-speed multi-qubit entangling gates.developing and numerically modeling phase-controlled fast entangling gate dynamics.Over the course of this project we will extend this proof-of-concept technique to demonstrate the first high-speed control of multi-qubit registers. We achieved a fidelity of 99.8% for a 1.6µs gate time, close to the highest reported two-qubit gate fidelities of 99.9%, but more than an order of magnitude faster. In preliminary work, we have recently demonstrated the first high-speed entangling logic gates for trapped-ion qubits. The aim of this project is to change this by exploiting optical phase control to significantly speed up trapped-ion entangling gates whilst also removing several currently limiting fundamental sources of error. However the speed of these devices, limited by the entangling gates, has not increased commensurately. Trapped-ion devices have demonstrated, on a small number of qubits, all the building-blocks required to build a quantum computer with precision better than any competing technology. developing and applying new theoretical tools to understand and optimise many-qubit couplings ![]() obtaining precision coherent control over individual atomic ions building an apparatus that uses a newly developed type of trapped-ion qubit The project will involve both experimental and theoretical work, including: This is a challenging project which will push the limits of laser technology, quantum/classical control techniques, and quantum algorithm design. The aim of this project is to develop and utilise a world-class intermediate-scale quantum computer that, by virtue of high-fidelity any-qubit-to-any-qubit entangling gates along with low error rates, will operate at a performance level currently unachievable in any other architecture.
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