Precision Isotope Shift Measurements in Calcium Ions Using Quantum Logic Detection Schemes

Gebert, Florian; Wan, Yong; Wolf, Fabian; Angstmann, Christopher N.; Berengut, J. C.; Schmidt, Piet O.

doi:10.1103/physrevlett.115.053003

Cited by 77 publications

(81 citation statements)

References 34 publications

(66 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recalculating neon levelshifts from these parameters results in a substantial increase in precision. This database of precise neon isotope shifts from 80 − 8000 nm may be used for calibration of collinear laser spectroscopy experiments at various accelerator facilities [96].…”

Section: Parametric Analysis and Global Fitmentioning

confidence: 99%

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

et al. 2019

View full text Add to dashboard Cite

We report new precision measurements of the 20 Ne-22 Ne isotope shift for several transitions, as well as state-of-the-art, ab initio field-shift calculations. Our results are combined with historical measurements in a global fit to obtain the isotope shifts of all fifty low-lying neon levels with high precision. These level shifts show a wealth of electronic, nuclear, and relativistic phenomena. Relying on the analogy between mass shift and fine-structure operators, we explain this plethora of neon level-shifts utilizing a small number of effective parameters in a global parametric investigation. This investigation provides a birds-eye view on the isotope shift phenomena in noble gasses. From this vantage point, we reinterpret every effort made to calculate neon mass-shifts ab initio, and show that a remarkable agreement between experiment and theory is obtained.

show abstract

Section: Parametric Analysis and Global Fitmentioning

confidence: 99%

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

et al. 2019

View full text Add to dashboard Cite

show abstract

“…PACS numbers: 32.70.Cs, 42.50.Lc, 37.10.Ty Due to its environmental isolation and long interrogation time, a single trapped 40 Ca + ion has been used as an ideal system for developing optical frequency standards [1] and for studying quantum information processes [2,3,4]. A trapped 40 Ca + ion has also been used for precision measurements to test atomic many-body theories [5,6,7].…”

mentioning

confidence: 99%

Precise determination of the quadrupole transition matrix element ofCa+40via branching-fraction and lifetime measurements

et al. 2017

View full text Add to dashboard Cite

We report the first experimental determination of the 4s 2 S 1/2 ↔ 3d 2 D 5/2 quadrupole transition matrix element in 40 Ca + by measuring the branching ratio of the 3d 2 D 5/2 state decaying into the ground state 4s 2 S 1/2 and the lifetime of the 3d 2 D 5/2 state, using a technique of highly synchronized measurement sequence for laser control and highly efficient quantum state detection for quantum jumps. The measured branching ratio and improved lifetime are, respectively, 0.9992(80) and 1.1652(46) s, which yield the value of the quadrupole transition matrix element (in absolute value) 9.737(43) ea 2 0 with the uncertainty at the level of 0.44%. The measured quadrupole transition matrix element is in good agreement with the most precise many-body atomic structure calculations. Our method can be universally applied to measurements of transition matrix elements in single ions and atoms of similar structure. [11,12] and experimentally [13], all-optical trapped ion clocks are feasible to be realized in the foreseeable future. One important issue for building such kind of trap is to overcome large ac Stark shifts due to use of high optical power; thus it is necessary to take higher-order effects into account by knowing the corresponding high-order transition matrix elements [14]. In quantum information research, because of long coherence time of the ground and metastable states, selected quadrupole transitions for encoding a quantum bit of information are used to realize quantum logic techniques. In plasma physics, quadrupole transitions open an observational window into hot plasmas of low electron density [15]. In astrophysics, quadrupole transition lines provide information on structure and physical characteristics of interstellar clouds [16,17]. Moreover, electric quadrupole transitions can be used to study atomic parity-violation in heavy ions [18,19]. Finally, comparison between experimentally measured quadrupole transition matrix elements and their corresponding theoretical values can test sophisticated relativistic atomic many-body theories.In principle, dipole transition matrix elements in an atom or ion can be determined by measuring its ac Stark shifts when exposed to a light, using the concept of magic-zero (tune-out) wavelengths, such as the work on where g k = 6 and λ is the transition wavelength inÅ [1].Single 40 Ca + ion is first laser cooled and trapped in a miniature ring Paul trap. A high-efficiency quantum state detection method for fluorescence counting and a highly synchronized measurement sequence for laser conarXiv:1609.04177v1 [physics.atom-ph]

show abstract

“…Here, it has the potential to enhance the sensitivity of relative mass measurements [54], indirect internal state detection [55,56] and the detection of small electrical [57,58] and optical [59][60][61] forces. We demonstrated the power of STIRAP in photon recoil spectroscopy [11,12] where the small force imprinted onto a two-ion crystal during absorption of a few photons leaves the motional state of the ions distributed over several trap levels. A STIRAP pulse on the red sideband probes the residual motional ground state population, which represents the spectroscopy signal.…”

Section: Resultsmentioning

confidence: 99%

“…Progress in trapped-ion quantum information processing [1][2][3][4], quantum simulation [5,6], and precision spectroscopy experiments [7][8][9][10][11][12] is largely based on advances in the ability to control and manipulate the quantum states of the system. Trapped and laser-cooled ions represent a particularly well-controlled system for which different techniques have been established to control the internal (electronic) and external (motional) state.…”

Section: Introductionmentioning

confidence: 99%

Detection of motional ground state population of a trapped ion using delayed pulses

et al. 2016

View full text Add to dashboard Cite

Efficient preparation and detection of the motional state of trapped ions is important in many experiments ranging from quantum computation to precision spectroscopy. We investigate the stimulated Raman adiabatic passage (STIRAP) technique for the manipulation of motional states in a trapped ion system. The presented technique uses a Raman coupling between two hyperfine ground states in 25 Mg + , implemented with delayed pulses, which removes a single phonon independent of the initial motional state. We show that for a thermal probability distribution of motional states the STIRAP population transfer is more efficient than a stimulated Raman Rabi pulse on a motional sideband. In contrast to previous implementations, a large detuning of more than 200 times the natural linewidth of the transition is used. This approach renders STIRAP suitable for atoms in which resonant laser fields would populate nearby fluorescing excited states and thus impede the STIRAP process. We use the technique to measure the wavefunction overlap of excited motional states with the motional ground state. This is an important application for force sensing applications using trapped ions, such as photon recoil spectroscopy, in which the signal is proportional to the depletion of motional ground state population. Furthermore, a determination of the ground state population enables a simple measurement of the ionʼs temperature.OPEN ACCESS RECEIVED has a Gaussian shape, whereas the frequency is varied linearly in time across an atomic resonance. RAP has been used in optical qubits on carrier transitions for robust internal state preparation [27][28][29][30], and on sideband transitions, to prepare Fock [31] and Dicke [32,33] states. The STIRAP technique is typically realized in Λ-systems and relies on an adiabatic evolution from an initial to a final state without populating a short-lived intermediate state. It is usually implemented using Gaussian-shaped intensity profiles of two laser pulses with a fixed frequency difference that are delayed with respect to each other in time. It has been demonstrated for population transfer [34] and the generation of Dicke states [35], and suggested for efficient qubit detection of single ions [36] and Doppler-free efficient state transfer in multi-ion crystals [37].Here we demonstrate STIRAP between hyperfine qubit states in 25 Mg + involving a change in the motional state. The coupling strength of such sideband transitions is strongly dependent on the initial motional state of the ion [38]. We used the insensitivity of STIRAP to the coupling strength to perform a complete population transfer of motionally excited states to determine the motional ground state population. For thermal states the ground state population is a direct measure for the temperature [39]. Using this approach, good agreement with the expected Doppler cooling temperature is found.We implement STIRAP using a large detuning, which is in contrast to the near resonant STIRAP transfer typically discussed in the literature [25,40]. In this si...

show abstract

Precision Isotope Shift Measurements in Calcium Ions Using Quantum Logic Detection Schemes

Cited by 77 publications

References 34 publications

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

Isotope shifts inNe20,22: Precision measurements and global analysis in the framework of intermediate coupling

Precise determination of the quadrupole transition matrix element ofCa+40via branching-fraction and lifetime measurements

Detection of motional ground state population of a trapped ion using delayed pulses

Contact Info

Product

Resources

About