Applied Physics B

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

Z. Y. Ma, Hao-Xiang Liu, W. Z. Wei, W. H. Yuan, P. Hao, Zhiying Deng, H. Che, Zhilin Xu, F. H. Cheng, Zhizhao Wang, Ke Deng, Jie Zhang, Z. H. Lu

Published Jul 8, 2020• 14 citations

Publisher

DOI: 10.1007/s00340-020-07479-4

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Applied Physics B

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

Z. Y. Ma, Hao-Xiang Liu, W. Z. Wei, W. H. Yuan, P. Hao, Zhiying Deng, H. Che, Zhilin Xu, F. H. Cheng, Zhizhao Wang, Ke Deng, Jie Zhang, Z. H. Lu

Published Jul 8, 2020• 14 citations

Publisher

DOI: 10.1007/s00340-020-07479-4

Related papers

An Aluminum Ion Optical Clock Using Quantum Logic

Till Rosenband, Piet O. Schmidt, David B. Hume +9 more

Bulletin of the American Physical SocietyMay 18, 20060 citations

Quantum Logic Spectroscopy of an Optical Clock Transition in a Cold Highly Charged Ion

S. A. King

Bulletin of the American Physical SocietyMay 31, 20190 citations

Direct Laser Cooling Al ${}^{+}$ Ion Optical ClocksDirect Laser Cooling Al${}^{+}$ Ion Optical Clocks

Jie Zhang, Ke Deng, Jun Luo +1 more

The Al ion optical clock is a very promising optical frequency standard candidate due to its extremely small black-body radiation shift. It has been successfully demonstrated with the indirect cooled, quantum-logic-based spectroscopy technique. Its accuracy is limited by second-order Doppler shift, and its stability is limited by the number of ions that can be probed in quantum logic processing. We propose a direct laser cooling scheme of Al ion optical clocks where both the stability and accuracy of the clocks are greatly improved. In the proposed scheme, two Al traps are utilized. The first trap is used to trap a large number of Al ions to improve the stability of the clock laser, while the second trap is used to trap a single Al ion to provide the ultimate accuracy. Both traps are cooled with a continuous wave 167 nm laser. The expected clock laser stability can reach . For the second trap, in addition to 167 nm laser Doppler cooling, a second stage pulsed 234 nm two-photon cooling laser is utilized to further improve the accuracy of the clock laser. The total systematic uncertainty can be reduced to about . The proposed Al ion optical clock has the potential to become the most accurate and stable optical clock .The Al ion optical clock is a very promising optical frequency standard candidate due to its extremely small black-body radiation shift. It has been successfully demonstrated with the indirect cooled, quantum-logic-based spectroscopy technique. Its accuracy is limited by second-order Doppler shift, and its stability is limited by the number of ions that can be probed in quantum logic processing. We propose a direct laser cooling scheme of Al ion optical clocks where both the stability and accuracy of the clocks are greatly improved. In the proposed scheme, two Al traps are utilized. The first trap is used to trap a large number of Al ions to improve the stability of the clock laser, while the second trap is used to trap a single Al ion to provide the ultimate accuracy. Both traps are cooled with a continuous wave 167 nm laser. The expected clock laser stability can reach . For the second trap, in addition to 167 nm laser Doppler cooling, a second stage pulsed 234 nm two-photon cooling laser is utilized to further improve the accuracy of the clock laser. The total systematic uncertainty can be reduced to about . The proposed Al ion optical clock has the potential to become the most accurate and stable optical clock .

arXiv:1609.03667Chinese Physics LettersMay 1, 201714 citations

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Optical clocks have been demonstrated to be good choices to redefine the SI ``second.'' With this goal, we have constructed a quantum-logic-based ${}^{27}$ $\mathrm{Al}$ ${}^{+}$ ion optical clock with a fractional frequency uncertainty of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$. A ${}^{25}$ $\mathrm{Mg}$ ${}^{+}$ ion is used as the logic ion for sympathetic cooling, state readout, and frequency-shift measurement of the ${}^{27}$ $\mathrm{Al}$ ${}^{+}$ ion. The stability of the optical clock is $2.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}/\sqrt{\ensuremath{\tau}}$, measured with a self-comparison method.Optical clocks have been demonstrated to be good choices to redefine the SI ``second.'' With this goal, we have constructed a quantum-logic-based ${}^{27}$$\mathrm{Al}$${}^{+}$ ion optical clock with a fractional frequency uncertainty of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$. A ${}^{25}$$\mathrm{Mg}$${}^{+}$ ion is used as the logic ion for sympathetic cooling, state readout, and frequency-shift measurement of the ${}^{27}$$\mathrm{Al}$${}^{+}$ ion. The stability of the optical clock is $2.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}/\sqrt{\ensuremath{\tau}}$, measured with a self-comparison method.

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Piet O. Schmidt, Till Rosenband, C. Langer +3 more

We present a general technique for precision spectroscopy of atoms that lack suitable transitions for efficient laser cooling, internal state preparation, and detection. In our implementation with trapped atomic ions, an auxiliary "logic" ion provides sympathetic laser cooling, state initialization, and detection for a simultaneously trapped "spectroscopy" ion. Detection is achieved by applying a mapping operation to each ion, which results in a coherent transfer of the spectroscopy ion's internal state onto the logic ion, where it is then measured with high efficiency. Experimental realization, by using 9Be+ as the logic ion and 27Al+ as the spectroscopy ion, indicates the feasibility of applying this technique to make accurate optical clocks based on single ions.We present a general technique for precision spectroscopy of atoms that lack suitable transitions for efficient laser cooling, internal state preparation, and detection. In our implementation with trapped atomic ions, an auxiliary "logic" ion provides sympathetic laser cooling, state initialization, and detection for a simultaneously trapped "spectroscopy" ion. Detection is achieved by applying a mapping operation to each ion, which results in a coherent transfer of the spectroscopy ion's internal state onto the logic ion, where it is then measured with high efficiency. Experimental realization, by using 9Be+ as the logic ion and 27Al+ as the spectroscopy ion, indicates the feasibility of applying this technique to make accurate optical clocks based on single ions.

ScienceJul 28, 2005642 citations

Investigation of experimental issues concerning successful operation of quantum-logic-based

^{27}\hbox {Al}^+

ion optical clock

Direct Laser Cooling Al

{}^{+}

Ion Optical Clocks

Experimental Progress on the NIST

^{27}

^{+}

Optical Clock

Optical clocks have been demonstrated to be good choices to redefine the SI ``second.'' With this goal, we have constructed a quantum-logic-based

{}^{27}

\mathrm{Al}

{}^{+}

ion optical clock with a fractional frequency uncertainty of $1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}$. A

{}^{25}

\mathrm{Mg}

{}^{+}

ion is used as the logic ion for sympathetic cooling, state readout, and frequency-shift measurement of the

{}^{27}

\mathrm{Al}

{}^{+}

ion. The stability of the optical clock is $2.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}/\sqrt{\ensuremath{\tau}}$, measured with a self-comparison method.