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MON: Monday Contributed Sessions

MON 6: QIP Implementations: Trapped Ions

MON 6.5: Vortrag

Montag, 8. September 2025, 15:15–15:30, ZHG007

Fast radio frequency-driven entangling gates with trapped ions using rapid phase switching — •Markus Nünnerich, Patrick Huber, Dorna Niroomand, and Christof Wunderlich — Department of Physics, School of Science and Technology, University of Siegen, 57068 Siegen, Gemany

Entangling gates are a fundamental component of any quantum processor, ideally operating at high speeds in a robust and scalable manner. Here, we experimentally investigate a novel radio frequency (RF)-driven two-qubit gate with trapped and laser cooled ¹⁷¹Yb⁺ ions exposed to a static magnetic gradient field of 19 T/m that induces an effective qubit-qubit interaction (Magnetic Gradient Induced Coupling, MAGIC). The hyperfine states |0⟩ ≡ |²S_1/2, F = 0, m_F = 0 ⟩ and |1⟩ ≡ |²S_1/2, F = 1, m_F = −1⟩ are used as qubits. We generate Bell states by applying continuously two RF driving fields, each one of them on resonance to one of the qubit transitions. By modulating the phase or amplitude of the driving fields, qubits are protected from addressing and RF amplitude fluctuations. In the experiments presented here, the phase of the driving fields varies periodically in discrete values, yielding effectively a sequence of back-to back dynamical decoupling pulses. By adjusting the Rabi frequency induced by the driving fields, the effective coupling of the qubits to the ions’ motional state is changed, and the entangling gate speed can be varied between ≈ 4 ms and ≈ 300 µs. In currently used micro-structured traps with larger magnetic field gradients, gate speeds on par with laser-driven gates in trapped ions are expected.

Keywords: Entangling gate; Trapped ions; Microwave; Magnetic gradient