Coherent Suppression of Tensor Frequency Shifts through Magnetic Field Rotation

Lange, R.; Huntemann, N.; Sanner, Christian; Shao, Hongxia; Lipphardt, B.; Tamm, Chr.; Peik, E.

doi:10.1103/physrevlett.125.143201

Cited by 15 publications

(16 citation statements)

References 37 publications

(56 reference statements)

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“…The quadrupole moment of the 2 F 7/2 state is given by Θ 2 F 7/2 = −0.0297(5)ea 2 0 33 , where e is the electron charge and a 0 is the Bohr radius. The electric field gradient is given by dE/dz = −m ion ω 2 z /q for a single trapped ion with mass m ion and charge q at the equilibrium position of the trap.…”

Section: The Measurement Sensitivitymentioning

confidence: 99%

Improved bounds on Lorentz violation from composite-pulse Ramsey spectroscopy in a trapped ion

Dreissen¹,

Yeh²,

Fürst³

et al. 2022

Preprint

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Gravity is not understood at a quantum mechanical level. In an attempt to formulate a single quantum-consistent theory of the four known fundamental forces, it is suggested that spontaneous breaking of Lorentz symmetry might occur at the Planck scale 1,2 . In the low-energy limit, such a Lorentz violation would give rise to small shifts of energy levels with non-spherical atomic orbitals 3 . These could be observed with precision spectroscopy of atoms in a Michelson-Morley type experiment using Earth's rotation [4][5][6] . In this work we perform such an experiment in the long-lived electronic 2 F 7/2 manifold of the Yb + ion. We exploit the high intrinsic susceptibility of this state to Lorentz violation 7 and apply an elaborate radio-frequency spin-echoed Ramsey sequence 8 to investigate the isotropy of space-time with a single trapped ion. A robust composite pulse sequence allows us to extend the coherence time to more than 1 s and accurately compare the orthogonally oriented sublevels of the Zeeman manifold. With a three times higher sensitivity to Lorentz violation compared to the best test to date 6 , we improve the constraints on all the measured Lorentz symmetry breaking coefficients and set their bounds at the 10 −21 level. These results represent the most stringent test of this type of Lorentz violation in the electron-photon sector. The method is readily extendable to multiple ions in Coulomb crystals, enabling improved tests of Lorentz symmetry in the near future.

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Section: The Measurement Sensitivitymentioning

confidence: 99%

Improved bounds on Lorentz violation from composite-pulse Ramsey spectroscopy in a trapped ion

Dreissen¹,

Yeh²,

Fürst³

et al. 2022

Preprint

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show abstract

“…Optical clocks have higher accuracy and stability than microwave clocks and may potentially be used to update the SI definition of a second [1]. In addition to optimizing the precision of time and frequency standards, optical clocks find applications in various fields such as quantum physics [2,3], tests of general and special relativity [4], geoid measurements [5], the physics beyond the standard model [6,7], etc. Optical clocks with better fractional frequency uncertainty and stability, at the 10 -18 or even better, would help improving the testing/measuring sensitivity, thus would increase the chance for searching new physics.…”

mentioning

confidence: 99%

A liquid nitrogen-cooled Ca+ optical clock with systematic uncertainty of 3×10-18

Huang¹,

Zhang²,

Zeng³

et al. 2021

Preprint

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Here we present a liquid nitrogen-cooled Ca+ optical clock with an overall systematic uncertainty of 3×10-18. In contrast with the room-temperature Ca+ optical clock that we have reported previously, the temperature of the blackbody radiation (BBR) shield in vacuum has been reduced to 82(5) K using liquid nitrogen. An ion trap with a lower heating rate and improved cooling lasers were also introduced. This allows cooling the ion temperature to the Doppler cooling limit during the clock operation, and the systematic uncertainty due to the ion’s secular (thermal) motion is reduced to < 1×10-18. The uncertainty due to the probe laser light shift and the servo error are also reduced to < 1×10-19 and 4×10-19 with the hyper-Ramsey method and the higher-order servo algorithm, respectively. By comparing the output frequency of the cryogenic clock to that of a room-temperature clock, the differential BBR shift between the two was measured with a fractional statistical uncertainty of 7×10-18. The differential BBR shift was used to calculate the static differential polarizability, and it was found in excellent agreement with our previous measurement with a different method. This work suggests that the BBR shift of optical clocks can be well suppressed in a liquid nitrogen environment. This is advantageous because conventional liquid-helium cryogenic systems for optical clocks are more expensive and complicated. Moreover, the proposed system can be used to suppress the BBR shift significantly in other types of optical clocks such as Yb+, Sr+, Yb, Sr, etc.

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“…A sufficiently strong magnetic field must be applied to ensure the first order Zeeman effect dominates over other nonscalar perturbations, as well as to suppress line-pulling effects. Exploiting known dependencies on m F and external field parameters, several schemes have been devised in an effort to evade prominent nonscalar perturbations [28][29][30][31][32][33][34][35][36][37]. The standard approach involves interleaving distinct interrogation conditions (e.g., different m F substates or magnetic field directions [9,10,13]) and taking an appropriate average of the spectroscopic output.…”

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confidence: 99%

Prospects of a Pb$^{2+}$ ion clock

Beloy

2021

Preprint

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We propose a high-performance atomic clock based on the 1.81 PHz transition between the ground and first-excited state of doubly ionized lead. Utilizing an even isotope of lead, both clock states have I = J = F = 0, where I, J, and F are the conventional quantum numbers specifying nuclear, electronic, and total angular momentum, respectively. The clock states are nondegenerate and completely immune to nonscalar perturbations, including first order Zeeman and electric quadrupole shifts. Additionally, the proposed clock is relatively insusceptible to other frequency shifts (blackbody radiation, second order Zeeman, Doppler), accommodates "magic" rf trapping, and is robust against decoherence mechanisms that can otherwise limit clock stability. By driving the transition as a two-photon E1+M 1 process, the accompanying probe Stark shift is appreciable yet manageable for practical Rabi frequencies.

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Coherent Suppression of Tensor Frequency Shifts through Magnetic Field Rotation

Cited by 15 publications

References 37 publications

Improved bounds on Lorentz violation from composite-pulse Ramsey spectroscopy in a trapped ion

Improved bounds on Lorentz violation from composite-pulse Ramsey spectroscopy in a trapped ion

A liquid nitrogen-cooled Ca+ optical clock with systematic uncertainty of 3×10-18

Prospects of a Pb$^{2+}$ ion clock

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