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QI: Fachverband Quanteninformation

QI 41: Quantum Computing and Simulation II (joint session Q/QI)

QI 41.2: Vortrag

Freitag, 14. März 2025, 11:30–11:45, AP-HS

Tuning the qubit-qubit interaction for multi-qubit quantum gates — •Patrick H. Huber, Dorna Niroomand, Markus Nünnerich, Patrick Barthel, and Christof Wunderlich — Walter-Flex-Straße 3, 57072 Siegen

Internal hyperfine states of ions trapped in a common potential provide long-lived qubits that can be coupled via the ions’ Coulomb interaction. A set of such qubits, analogous to a classical register, can be referred to as a quantum register. The Magnetic Gradient Induced Coupling (MAGIC) approach to quantum computing with trapped ions can provide an always-on, all-to-all Ising-type interaction between radio frequency-controlled qubits in such a quantum register [1,2]. The interaction strength is determined by the trapping potential and the applied magnetic field gradient. Here we present a novel method that allows for the tuning of the qubits’ interaction without changing the trapping potential nor the magnetic field while simultaneously preserving the qubits’ coherence. This method uses pulsed dynamical decoupling and is demonstrated experimentally in a quantum register of four laser-cooled ¹⁷¹Yb⁺ qubits. It is used to synthesize an arbitrary coupling matrix within a quantum register and to generate non-interacting subregisters. Thus, this method opens up novel ways for efficiently synthesizing quantum algorithms on a trapped ion quantum computer. [1] A. Khromova et al., Phys. Rev. Lett. 108, 220502 (2012). [2] P. Baßler et al., Quantum 7, 984 (2023).

Keywords: Multi qubit gates; Trapped ion; Quantum computing