Lifetime measurement of the 5d2 D 5/2 state in Ba+

Mohanty, Amita; Dijck, Elwin; Portela, Mayerlin Nunez; Valappol, Nivedya; Grier, Andrew T.; Meijknecht, Thomas; Willmann, Lorenz; Jungmann, Klaus-Peter

doi:10.1007/s10751-015-1161-9

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Considering typical metastable state lifetimes (e.g. τ ∼ 60 ms for 2 D 3/2 in Yb + [167], τ ∼ 26 s for 2 D 5/2 in Ba + [168] or τ ∼ 3700 days for 2 F 7/2 in Yb + [169,170]), this error can be made negligible depending on the atomic levels in use. Qubit hiding also allows to use the ions that have been measured for sympathetic recooling to eliminate the heating of the shared motional modes induced by the measurement.…”

Section: Entanglement Transitionmentioning

confidence: 99%

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Sierant

Chiriacò

Surace

et al. 2022

Quantum

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Quantum systems evolving unitarily and subject to quantum measurements exhibit various types of non-equilibrium phase transitions, arising from the competition between unitary evolution and measurements. Dissipative phase transitions in steady states of time-independent Liouvillians and measurement induced phase transitions at the level of quantum trajectories are two primary examples of such transitions. Investigating a many-body spin system subject to periodic resetting measurements, we argue that many-body dissipative Floquet dynamics provides a natural framework to analyze both types of transitions. We show that a dissipative phase transition between a ferromagnetic ordered phase and a paramagnetic disordered phase emerges for long-range systems as a function of measurement probabilities. A measurement induced transition of the entanglement entropy between volume law scaling and sub-volume law scaling is also present, and is distinct from the ordering transition. The two phases correspond to an error-correcting and a quantum-Zeno regimes, respectively. The ferromagnetic phase is lost for short range interactions, while the volume law phase of the entanglement is enhanced. An analysis of multifractal properties of wave function in Hilbert space provides a common perspective on both types of transitions in the system. Our findings are immediately relevant to trapped ion experiments, for which we detail a blueprint proposal based on currently available platforms.

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Section: Entanglement Transitionmentioning

confidence: 99%

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Sierant

Chiriacò

Surace

et al. 2022

Quantum

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“…Considering typical metastable state lifetimes (e.g. τ ∼ 60 ms for 2 D 3/2 in Yb + [151], τ ∼ 26 s for 2 D 5/2 in Ba + [152] or τ ∼ 3700 days for 2 F 7/2 in Yb + [153,154]), this error can be made negligible depending on the atomic levels in use. Qubit hiding also allows to use the ions that have been measured for sympathetic recooling to eliminate the heating of the shared motional modes induced by the measurement.…”

Section: Entanglement Transitionmentioning

confidence: 99%

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Sierant,

Chiriacò,

Surace

et al. 2021

Preprint

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Quantum systems evolving unitarily and subject to quantum measurements exhibit various types of non-equilibrium phase transitions, arising from the competition between unitary evolution and measurements. Dissipative phase transitions in steady states of time-independent Liouvillians and measurement induced phase transitions at the level of quantum trajectories are two primary examples of such transitions. Investigating a many-body spin system subject to periodic resetting measurements, we argue that many-body dissipative Floquet dynamics provides a natural framework to analyze both types of transitions. We show that a dissipative phase transition between a ferromagnetic ordered phase and a paramagnetic disordered phase emerges for long-range systems as a function of measurement probabilities. A measurement induced transition of the entanglement entropy between volume law scaling and area law scaling is also present, and is distinct from the ordering transition. The ferromagnetic phase is lost for short range interactions, while the volume law phase of the entanglement is enhanced. An analysis of multifractal properties of wave function in Hilbert space provides a common perspective on both types of transitions in the system. Our findings are immediately relevant to trapped ion experiments, for which we detail a blueprint proposal based on currently available platforms.

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“…One method is to use a particle accelerator. This technique is used at the triumf [124] and isolde facilities [125] and has previously been used in our group to study the neutron-poor isotopes [209][210][211][212][213][214] Ra [45,49,64]. However, for further experiments an offline source was desired for greater flexibility and simplicity.…”

Section: Offline Ra + Source Designmentioning

confidence: 99%

“…This should be considered to replace the lifetime value of Ref.166. An incomplete analysis of a subset of the same data was published previously as Ref 21246.…”

mentioning

confidence: 99%

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

Dijck

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Trapped Ba + and Ra + ions offer the possibility to test the Standard Model by performing an independent high-precision determination of the Weinberg angle (sin 2 θ W) at low momentum transfer. In such a measurement of atomic parity violation, table-top experiments complement studies of weak interaction effects at high energy in the search for new physics. The singly-charged heavy alkaline earth metal ions combine high intrinsic sensitivity with tractable atomic structure owing to their single valence electron. In addition, trapped Ba + or Ra + ions can serve as reference for an optical atomic clock that is sensitive to variation of the fine structure constant α. Determining sin 2 θ W requires localizing a single laser-cooled Ba + or Ra + ion in a standing-wave light field to a fraction of an optical wavelength. High-precision atomic theory calculations are crucial for interpreting the measurements and need experimental input. We have performed preparatory spectroscopy measurements with trapped Ba + ions and investigated experimental techniques for characterizing ion traps. We have determined the optical transition frequencies between low-lying levels of 138 Ba + with laser spectroscopy referenced to an optical frequency comb. Using a lineshape model based on eight-level optical Bloch equations, we determined the 6s 2 S 1/2-5d 2 D 3/2 transition frequency to be 146 114 384.0(0.1) MHz and the 5d 2 D 3/2-6p 2 P 1/2 transition frequency to be 461 311 878.5(0.1) MHz, obtaining for the first time sub-MHz precision on these transitions. Light shifts play an important role in the measurement of sin 2 θ W and offer a way to obtain information on (ratios of) atomic transition matrix elements. We have carried out an exploratory study of the light shift in 138 Ba + caused by an off-resonant laser tuned close to the 5d 2 D 3/2-6p 2 P 1/2 transition. The observed spectra are analyzed by combining the optical lineshapes with calculated light shifts of individual Zeeman components. Atomic state lifetimes provide a benchmark for calculations of transition amplitudes. We have measured the lifetime of the long-lived 5d 2 D 5/2 level in 138 Ba + using a technique based on quantum jumps with one to four trapped ions. We have investigated known systematic effects in detail to evaluate their influence. We measured the lifetime of the 5d 2 D 5/2 level to be 26.3(0.6) s, which is about 4σ shorter than previously published experimental results. This discrepancy needs to be clarified to ensure the reliability of atomic parity violation measurements ahead. This work contributes toward a precise determination of sin 2 θ W with trapped Ba + or Ra + ions in search of physics beyond the Standard Model.

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Lifetime measurement of the 5d2 D 5/2 state in Ba+

Cited by 5 publications

References 24 publications

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Dissipative Floquet Dynamics: from Steady State to Measurement Induced Criticality in Trapped-ion Chains

Spectroscopy of Trapped ¹³⁸Ba⁺ Ions for Atomic Parity Violation and Optical Clocks

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