Investigation of experimental issues concerning successful operation of quantum-logic-based $$^{27}\hbox {Al}^+$$ ion optical clock

Y., Z.; Liu, H. L.; Wei, Wen-Zhe; Yuan, Wenhao; Hao, Peng; Deng, Zhen; Che, Hao; Xu, Zhilin; Cheng, Feng; Wang, Z. Y.; Deng, Ke; Zhang, Jie; Lu, Zehuang

doi:10.1007/s00340-020-07479-4

Cited by 15 publications

(5 citation statements)

References 59 publications

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“…We use a wafer trap that is similar to the one used in NIST's 25 Mg + -27 Al + clock [24] to form a pair aligned along the trap (z) axis. The distance from the endcap electrode to the ion is 10 mm, and the distance from the radio-frequency (rf) electrode to the ion is 250 µm.…”

Section: Methodsmentioning

confidence: 99%

“…[11][12][13] Various means have been proposed and demonstrated to prepare ions to the motional ground state. To reduce the secular motion time-dilation shift and uncertainty of the 27 Al + optical clock, the three-dimensional (3D) ground state of the 25 Mg + - 27 Al + two-ion pair has been achieved. [1] Although traditional sideband cooling [14] and Raman sideband cooling [15] are capable of preparing an ion in a quantum mechanical ground state, those methods typically cool one mode at a time due to their narrow cooling band.…”

Section: Introductionmentioning

confidence: 99%

“…[19] Here, we demonstrate sympathetically EIT cooling of a pair of 40 Ca + -27 Al + . Compared with the traditional 27 Al + ion optical clock scheme based on a 25 Mg + -27 Al + ion pair [24,25] and 9 Be + -27 Al + ion pair, [17] the lasers involved in the 40 Ca + experiments are simpler because all lasers of 40 Ca + required for cooling and detection are easily acquired from external cavity diode lasers. [27] The dynamic of cooling long ion chain consisting of 40 Ca + has been well investigated, [22] offering a possibility of evaluating the time-dilation shift of the 27 Al + with high accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock

et al. 2023

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We report on electromagnetically induced transparency cooling of 40Ca+ to sympathetically cool the three-dimensional secular modes of motion in a 40Ca+-27Al+ two-ion pair near the ground state. We observe simultaneous ground state cooling across all radial modes and axial modes of a 40Ca+-27Al+ ion pair, occupying a broader cooling range in frequency space over 3 MHz. The cooling time is observed to be less than 1 ms. The mean phonon number and heating rates of all motional modes are measured. This study is not only an important step for reducing the secular motion time-dilation shift uncertainty and uptime ratio of 27Al+ optical clock but is also essential for high-fidelity quantum simulations and quantum information processors using trapped ions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock

et al. 2023

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“…It reduce the coherence time and cause broadening the clock transition, which means a larger quantum projection noise limit of the clock. For the 27 Al + ion optical clock in which 25 Mg + ion plays the role of logic ion [34,35], magnetic field noise can be measured by the 25 Mg + ion. Using the magnetic field information obtained through 25 Mg + ion, we can calculate the contribution of the magnetic field noise to the quantum projection noise of the 25 Mg + -27 Al + optical clock.…”

Section: Introductionmentioning

confidence: 99%

Measurement and suppression of magnetic field noise of trapped ion qubit

Wei¹,

Hao²,

Ma³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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Magnetic field noise is an important factor causing quantum decoherence in quantum systems. In order to suppress the decoherence effect, magnetic field noise needs to be properly measured and controlled. Magnetic field noise power spectrum measurement using a single trapped ion based quantum spectrum analyzer is a very effective way. In this paper, the magnetic field noise measurement based on dynamic decoupling technique is analyzed theoretically. Furthermore, we use magnetically insensitive transition to measure the magnetic field noise, which has the potential to measure stronger magnetic field noise and speed up the measurement process. In our experiment, we suppress the magnetic field noise by using active feedback control and passive compensation, where the required passive compensation amplitude is obtained by measuring the magnetic field noise spectrum of a single 25Mg+ ion. With the magnetic field noise suppressed, the expected contribution of the magnetic field noise to the stability of the 25Mg+- 27Al+ ion optical clock can be decreased from 2.8×10-15/√τ to 7.2 × 10-16/√τ .

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“…[5][6][7] More and more optical clocks are using composite systems for sympathetic cooling or quantum logic readout. 3,[8][9][10][11][12][13][14][15] In addia) Tanja.Mehlstaeubler@ptb.de tion, there is an increasing interest in multi-ion clock operation to increase the signal-to-noise ration compared to single-ion clocks. [16][17][18][19][20][21] For this new generation of clocks linear ion traps are needed, which are also an ideal platform for quantum computation and quantum simulation.…”

Section: Introductionmentioning

confidence: 99%

Sub-kelvin temperature management in ion traps for optical clocks

Nordmann,

Didier,

Doležal

et al. 2020

Preprint

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The uncertainty of the ac Stark shift due to thermal radiation represents a major contribution to the systematic uncertainty budget of state-of-the-art optical atomic clocks. In the case of optical clocks based on trapped ions, the thermal behavior of the rf-driven ion trap must be precisely known. This determination is even more difficult when scalable linear ion traps are used. Such traps enable a more advanced control of multiple ions and have become a platform for new applications in quantum metrology, simulation and computation. Nevertheless, their complex structure makes it more difficult to precisely determine its temperature in operation and thus the related systematic uncertainty. We present here scalable linear ion traps for optical clocks, which exhibit very low temperature rise under operation. We use a finiteelement model refined with experimental measurements to determine the thermal distribution in the ion trap and the temperature at the position of the ions. The trap temperature is investigated at different rf-drive frequencies and amplitudes with an infrared camera and integrated temperature sensors. We show that for typical trapping parameters for In + , Al + , Lu + , Ca + , Sr + or Yb + ions, the temperature rise at the position of the ions resulting from rf heating of the trap stays below 700 mK and can be controlled with an uncertainty on the order of a few 100 mK maximum.

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Investigation of experimental issues concerning successful operation of quantum-logic-based $$^{27}\hbox {Al}^+$$ ion optical clock

Cited by 15 publications

References 59 publications

Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock

Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock

Measurement and suppression of magnetic field noise of trapped ion qubit

Sub-kelvin temperature management in ion traps for optical clocks

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Investigation of experimental issues concerning successful operation of quantum-logic-based $$^{27}\hbox {Al}^+$$ ion optical clock

Cited by 15 publications

References 59 publications

Sympathetic electromagnetically induced transparency ground state cooling of a 40Ca+–27Al+ pair in an 27Al+ clock

Sympathetic electromagnetically induced transparency ground state cooling of a 40Ca+–27Al+ pair in an 27Al+ clock

Measurement and suppression of magnetic field noise of trapped ion qubit

Sub-kelvin temperature management in ion traps for optical clocks

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Product

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Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock

Sympathetic electromagnetically induced transparency ground state cooling of a ⁴⁰Ca⁺–²⁷Al⁺ pair in an ²⁷Al⁺ clock