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Fast, Robust and Laser-Free Universal Entangling Gates for Trapped-Ion Quantum Computing

Markus Nünnerich,Daniel Cohen, Patrick Barthel, Patrick H. Huber,Dorna Niroomand,Alex Retzker,Christof Wunderlich

arXiv (Cornell University)(2024)

University of Siegen Department of Physics | Racah Institute of Physics | Racah Institute of Physics AWS Center for Quantum Computing

Cited 0|Views14
Abstract
A novel two-qubit entangling gate for trapped-ion quantum processors is proposed theoretically and demonstrated experimentally. During the gate, double-dressed quantum states are created by applying a phase-modulated continuous driving field. The speed of this gate is an order of magnitude higher than that of previously demonstrated radio frequency (RF) controlled two-qubit entangling gates in static magnetic field gradients. At the same time, the field driving the gate, dynamically decouples the qubits from amplitude and frequency noise, increasing the qubits' coherence time by three orders of magnitude. The gate requires only a single continuous RF field per qubit, making it well suited for scaling a quantum processor to large numbers of qubits. Implementing this entangling gate, we generate the Bell states |Φ^+ ⟩ and |Ψ^+⟩ in ≤ 313 μs with fidelities up to 98^+2_-3 % in a static magnetic gradient of only 19.09 T/m. At higher magnetic field gradients, the entangling gate speed can be further improved to match that of laser-based counterparts.
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Fault-tolerant Quantum Computation,Quantum Simulation,Quantum Computation
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要点】:本文提出并实验验证了一种新型高速、稳健且无需激光的通用两比特纠缠门,大幅提升了离子阱量子处理器的性能。

方法】:通过应用相位调制连续驱动场创建双修饰量子态,实现了一种新型的两比特纠缠门。

实验】:在静态磁场梯度下,使用此方法在≤313 μs内生成了Bell态 |Φ^+⟩ 和 |Ψ^+⟩,保真度高达98^+2_-3 %,实验使用的数据集为离子阱量子处理器。