Micromotion minimization using Ramsey interferometry

Higgins, Gerard,1989Stockholms universitet,Fysikum,Chalmers University of Technology, Sweden,Chalmers tekniska högskola,Stockholm University (author)

We minimize the stray electric field in a linear Paul trap quickly and accurately, by applying interferometry pulse sequences to a trapped ion optical qubit. The interferometry sequences are sensitive to the change of ion equilibrium position when the trap stiffness is changed, and we use this to determine the stray electric field. The simplest pulse sequence is a two-pulse Ramsey sequence, and longer sequences with multiple pulses offer a higher precision. The methods allow the stray field strength to be minimized beyond state-of-the-art levels. Using a sequence of nine pulses we reduce the 2D stray field strength to (10.5 +/- 0.8) mV m(-1) in 11 s measurement time. The pulse sequences are easy to implement and automate, and they are robust against laser detuning and pulse area errors. We use interferometry sequences with different lengths and precisions to measure the stray field with an uncertainty below the standard quantum limit. This marks a real-world case in which quantum metrology offers a significant enhancement. Also, we minimize micromotion in 2D using a single probe laser, by using an interferometry method together with the resolved sideband method; this is useful for experiments with restricted optical access. Furthermore, a technique presented in this work is related to quantum protocols for synchronizing clocks; we demonstrate these protocols here.

Salim, ShalinaStockholms universitet,Fysikum,Stockholm University(Swepub:su)shsa7316 (author)
Zhang, ChiStockholms universitet,Fysikum,Imperial College of Science, Technology and Medicine,Stockholm University(Swepub:su)chizh (author)
Parke, HarryStockholms universitet,Fysikum,Stockholm University(Swepub:su)hapa3074 (author)
Pokorny, FabianStockholms universitet,Fysikum,University Of Oxford,Stockholm University (author)
Hennrich, MarkusStockholms universitet,Fysikum,Stockholm University(Swepub:su)mhenn (author)
Stockholms universitetFysikum (creator_code:org_t)

By the author/editor: Higgins, Gerard, ...; Salim, Shalina; Zhang, Chi; Parke, Harry; Pokorny, Fabian; Hennrich, Markus

About the subject

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