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Updated: Sep 9, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Robust Two-Qubit Geometric Phase Gates Using Amplitude and Frequency Ramping
C M Bowers1,2, D Palani1,3, J J Barta1,2
1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Abstract:
We demonstrate a method for generating entanglement between trapped atomic ions based on adiabatically ramped state-dependent forces. By ramping both the amplitude of the state-dependent force and the motional mode frequencies, we realize an entangling operation that is robust to motional mode occupation and drifts in the mode frequencies. We measure Bell state fidelities above 0.99 across a broad range of ramp parameters and with motional occupations up to ten phonons. This technique enables high-fidelity entangling operations without ground-state cooling, has a reduced calibration overhead, and is well suited for both quantum logic spectroscopy applications and scalable quantum computing architectures.
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