Fast, robust and laser-free universal entangling gates for trapped-ion quantum computing

• URL: http://arxiv.org/abs/2403.04730v1
• Date: Thu, 7 Mar 2024 18:33:50 GMT
• Title: Fast, robust and laser-free universal entangling gates for trapped-ion quantum computing
• Authors: Markus N\"unnerich, Daniel Cohen, Patrick Barthel, Patrick H. Huber, Dorna Niroomand, Alex Retzker, and Christof Wunderlich
• Abstract summary: The speed of this gate is an order of magnitude higher than that of previously demonstrated two-qubit entangling gates in static magnetic field gradients. 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.
• Score: 4.063218695552192
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: A novel two-qubit entangling gate for RF-controlled trapped-ion quantum processors is proposed theoretically and demonstrated experimentally. The speed of this gate is an order of magnitude higher than that of previously demonstrated two-qubit entangling gates in static magnetic field gradients. At the same time, the phase-modulated field driving the gate, dynamically decouples the qubits from amplitude and frequency noise, increasing the qubits' coherence time by two 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 $|\Phi^+\rangle$ and $|\Psi^+\rangle$ in $\leq 313$ $\mathrm{\mathrm{\mu}}$s 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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