Micromotion minimisation by synchronous detection of parametrically excited motion

Nadlinger, D. P.; Drmota, P.; Main, D.; Nichol, B. C.; Araneda, Gabriel; Srinivas, R.; Stephenson, L. J.; Ballance, C. J.; Lucas, David M.

doi:10.48550/arxiv.2107.00056

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…If one wishes to relate φ to the offset field E, one can use equation (12) or equation (23). This requires knowledge of the direction of the laser field wavevectors and the change of the secular frequencies.…”

Section: Applying the Interferometry Methods In 2d And 3dmentioning

confidence: 99%

“…Although a host of techniques have been developed to determine appropriate compensation electrode voltages [1][2][3][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], there is a demand to improve upon the existing techniques, so that trapped ions can Figure 1. At the minimum (position 0) of a Paul trap's effective RF potential (blue solid lines) there is no oscillating dipolar electric field.…”

Section: Introductionmentioning

confidence: 99%

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Micromotion minimization using Ramsey interferometry

Higgins

Salim²,

Zhang³

et al. 2021

New J. Phys.

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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)mVm-1 in 11s 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.

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Section: Applying the Interferometry Methods In 2d And 3dmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micromotion minimization using Ramsey interferometry

Higgins

Salim²,

Zhang³

et al. 2021

New J. Phys.

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show abstract

“…Another method to detect an offset between the static and rf fields is to mix in a voltage at frequency ω j in the rf signal. If the ion is not situated in a position where E rf = 0, this field can parametrically excite the ion, which will be visible in the fluorescence (Ibaraki et al, 2011;Narayanan et al, 2011;Tanaka et al, 2012;Keller et al, 2015;Nadlinger et al, 2021).…”

Section: Excess Micromotionmentioning

confidence: 99%

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Lous,

Gerritsma

2022

Preprint

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Experimental setups that study laser-cooled ions immersed in baths of ultracold atoms merge the two exciting and well-established fields of quantum gases and trapped ions. These experiments benefit both from the exquisite read-out and control of the few-body ion systems as well as the many-body aspects, tunable interactions, and ultracold temperatures of the atoms. However, combining the two leads to challenges both in the experimental design and the physics that can be studied. Nevertheless, these systems have provided insights into ion-atom collisions, buffer gas cooling of ions and quantum effects in the ion-atom interaction. This makes them promising candidates for ultracold quantum chemistry studies, creation of cold molecular ions for spectroscopy and precision measurements, and as test beds for quantum simulation of charged impurity physics. In this review we aim to provide an experimental account of recent progress and introduce the experimental setup and techniques that enabled the observation of quantum effects.

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“…Charging of the trap due to the Raman laser beams is automatically compensated every ∼ 5 min using the method described in Ref. [45].…”

mentioning

confidence: 99%

Long-lived entanglement memory in a trapped-ion quantum network node

Drmota¹,

Nadlinger²,

Nichol³

et al. 2022

Preprint

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We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network node. Ion-photon entanglement first generated with a network qubit in 88 Sr + is transferred to 43 Ca + with 0.977(7) fidelity, and mapped to a robust memory qubit. We then entangle the network qubit with another photon, which does not affect the memory qubit. We perform quantum state tomography to show that the fidelity of ion-photon entanglement decays ∼ 100 times slower on the memory qubit. Dynamical decoupling further extends the storage time; we measure an ion-photon entanglement fidelity of 0.81(4) after 10 s.

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Micromotion minimisation by synchronous detection of parametrically excited motion

Cited by 4 publications

References 35 publications

Micromotion minimization using Ramsey interferometry

Micromotion minimization using Ramsey interferometry

Ultracold ion-atom experiments: cooling, chemistry, and quantum effects

Long-lived entanglement memory in a trapped-ion quantum network node

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