Tunable transverse spin-motion coupling for quantum information processing
| Autor: | Paul Hamilton, Wesley C. Campbell, Randall Putnam, Adam West |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Coupling
Physics Quantum Physics Physics and Astronomy (miscellaneous) Atomic Physics (physics.atom-ph) Materials Science (miscellaneous) Momentum transfer FOS: Physical sciences Quantum entanglement Laser Atomic and Molecular Physics and Optics law.invention Physics - Atomic Physics Momentum Transverse plane law Qubit Electrical and Electronic Engineering Atomic physics Quantum Physics (quant-ph) Spin-½ |
| DOI: | 10.48550/arxiv.2007.10437 |
| Popis: | Laser-controlled entanglement between atomic qubits (`spins') and collective motion in trapped ion Coulomb crystals requires conditional momentum transfer from the laser. Since the spin-dependent force is derived from a spatial gradient in the spin-light interaction, this force is typically longitudinal -- parallel and proportional to the average laser $k$-vector (or two beams' $k$-vector difference), which constrains both the direction and relative magnitude of the accessible spin-motion coupling. Here, we show how momentum can also be transferred perpendicular to a single laser beam due to the gradient in its transverse profile. By controlling the transverse gradient at the position of the ion through beam shaping, the relative strength of the sidebands and carrier can be tuned to optimize the desired interaction and suppress undesired, off-resonant effects that can degrade gate fidelity. We also discuss how this effect may already be playing an unappreciated role in recent experiments. Comment: 11 pages, 4 figures + SM |
| Databáze: | OpenAIRE |
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