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arXiv:1306.0603 · Nature Communications

Robust site-resolvable quantum gates in an optical lattice via inhomogeneous control

Jae Hoon Lee, Enrique Montaño, Ivan Deutsch, Poul Jessen

Published Jun 18, 2013• 42 citations
arXivHTMLPDF
DOI
10.1038/ncomms3027

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Single-site-resolved addressing offers an unprecedented capability of manipulating atoms in optical lattices. We demonstrate a robust site-resolved addressing by locking the position of the addressing beam to the optical lattice phase. The addressing beam is modulated by a digital micromirror device (DMD) integrated into a quantum gas microscope (QGM). A typical experiment with ultracold atoms takes several hours to collect hundreds of samples by repeating the sequence of programmed operations, whose duration is 40 seconds. During the collection, the phase of optical lattices can drift over a few lattice sites. According to the phases of the lattice obtained from the current experimental realizations, we correct the addressing beam position for the subsequent realization by shifting the pattern of the activated micromirrors on the DMD. This feedback loop is compiled to an application with a graphical user interface (GUI) for relevant devices, which is synchronized to the experimental sequence. The long-term (5 hours) position deviation between the pointing of the addressing beam and the lattice phase is suppressed to a 0.02(2)/0.02(2) lattice spacing in the X/Y direction, verifying a 10-fold reduction in comparison to that without feedback. With the help of phase-locking, the success rate of site-resolved addressing is improved substantially from 60(7)% to 95(2)%.