Quantum computing with trapped ions Fast, high-fidelity entanglement via optical phase control

捕获离子设备已经在少量量子比特上展示了构建量子计算机所需的所有构建模块，其精度优于任何竞争技术。该项目的目的是开发和利用世界级的中尺度量子计算机，凭借高保真的任何量子比特到任何量子比特的纠缠门沿着低错误率，将以目前任何其他架构都无法实现的性能水平运行。Chris Ballance博士捕获离子设备已经在少量量子比特上演示了，这是建造量子计算机所需的所有构件，其精度优于任何竞争技术。然而，这些设备的速度，受到纠缠门的限制，并没有迅速增加。该项目的目的是通过利用光学相位控制来改变这一点，以显着加快捕获的离子纠缠门，同时也消除了几个目前限制的基本误差源。在初步工作中，我们最近展示了第一个用于捕获离子量子位的高速纠缠逻辑门。我们在1.6门时间内实现了99.8%的保真度，接近报道的最高双量子位门保真度99.9%，但快了一个数量级以上。在这个项目的过程中，我们将扩展这种概念验证技术，以演示多量子位寄存器的第一个高速控制。

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. 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.Dr Chris BallanceTrapped-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. However the speed of these devices, limited by the entangling gates, has not increased commensurately. 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. In preliminary work, we have recently demonstrated the first high speed entangling logic gates for trapped ion qubits. We achieved a fidelity of 99.8% for a 1.6 gate time, close to the highest reported two-qubit gate fidelities of 99.9%, but more than an order of magnitude faster. 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.