Cubic Phase Gate with a Trapped Ion Oscillator

Abstract:The motional modes of trapped ions are promising candidates for continuous-variable (CV) quantum computation and simulation. However, to achieve a universal gate set for CV quantum computation, anharmonic nonlinear unitaries are required. Here, we experimentally demonstrate a protocol that allows us to approximate the cubic phase gate. By numerically optimizing the phase angles and amplitudes of a set of state-dependent force pulses, we demonstrate the cubic phase gate for both vacuum and low-$\alpha$ coherent state inputs and verify its performance. Our protocol can also be extended to approximate other nonlinear unitaries.

Quantum Physics (quant-ph); Atomic Physics (physics.atom-ph)

arXiv:2609.34774 [quant-ph]

(or arXiv:2609.34774v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2609.34774 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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