Resolving an Individual One-Proton Spin Flip to Determine a Proton Spin State

DiSciacca, Jack; Marshall, M.; Marable, K.; Gabrielse, Gerald

doi:10.1103/physrevlett.110.140406

Cited by 33 publications

(45 citation statements)

References 13 publications

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“…Both have very recently produced first data and an improvement of the relative precision to the anticipated 10 −9 is foreseeable for the close future. First single spinflips of a single proton have been observed by both teams [75,76]. A future extension of these experiments to antiprotons will require injection of low-energy antiprotons from an accelerator, similar as performed in antihydrogen experiments at CERN.…”

Section: Implications For Fundamental Symmetriesmentioning

confidence: 99%

Electron g‐factor determinations in Penning traps

2013

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The magnetic moment of the electron, expressed by the g-factor in units of the Bohr magneton, is a key quantity in the theory of quantum electrodynamics (QED). Experiments using single particles confined in Penning traps have provided very precise values of the g-factor for the free electron as well as the electron bound in hydrogen-like ions. In this paper the status of these experiments is reviewed. The results allow testing calculations of higher order Feynman diagrams. Comparison of experimental and theoretical results for free and bound particles show no discrepancy within the limits of error, thus representing to date the most sensitive test of QED. Moreover, the g-factor provides a unique access to fundamental constants, as e.g. the electron mass or the fine structure constant.

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Section: Implications For Fundamental Symmetriesmentioning

confidence: 99%

Electron g‐factor determinations in Penning traps

2013

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“…Over the past decades, several experimental methods have been devised for quantum control of single trapped ions [2][3][4]. Developments are driven by the urge to make more accurate and precise clocks [5,6] as well as to address questions in different fields of research, e.g., properties of highly charged ions [7,8], ion-neutral collisions [9][10][11][12], molecular physics [13][14][15], and tests of fundamental physics [16][17][18][19][20]. High-resolution spectroscopy measurements [21][22][23][24][25] are of particular interest for studying spatial and temporal fine structure variations of the universe [26][27][28].…”

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confidence: 99%

Decoherence-Assisted Spectroscopy of a SingleMg+Ion

Clos

Enderlein²,

Warring³

et al. 2014

Phys. Rev. Lett.

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We describe a high-resolution spectroscopy method, in which the detection of single excitation events is enhanced by a complete loss of coherence of a superposition of two ground states. Thereby, transitions of a single isolated atom nearly at rest are recorded efficiently with high signal-to-noise ratios. Spectra display symmetric line shapes without stray-light background from spectroscopy probes. We employ this method on a 25 Mg + ion to measure one, two, and three-photon transition frequencies from the 3S ground state to the 3P, 3D, and 4P excited states, respectively. Our results are relevant for astrophysics and searches for drifts of fundamental constants. Furthermore, the method can be extended to other transitions, isotopes, and species. The currently achieved fractional frequency uncertainty of 5 × 10 −9 is not limited by the method.Quantum systems that are well isolated from their environments, e.g., tailored solid-state systems, photons, and trapped atoms, offer a high level of control [1]. Over the past decades, several experimental methods have been devised for quantum control of single trapped ions [2][3][4]. Developments are driven by the urge to make more accurate and precise clocks [5,6] as well as to address questions in different fields of research, e.g., properties of highly charged ions [7,8], ion-neutral collisions [9][10][11][12], molecular physics [13][14][15], and tests of fundamental physics [16][17][18][19][20]. High-resolution spectroscopy measurements [21][22][23][24][25] are of particular interest for studying spatial and temporal fine structure variations of the universe [26][27][28]. In such experiments, complex atomic and molecular structures need to be probed by singleor multi-photon transitions in isotopically pure samples revealing undisturbed transition line shapes. Weak transitions in trapped ions can be measured with various methods [3,6], and techniques based on the detection of momentum kicks altering the occupation of motional states from few absorbed photons have been developed that are applicable to strong electric dipole transitions as well [25,29]. In this Letter, we experimentally study single-and multi-photon transitions in a single, laser cooled 25 Mg + ion that can be near-perfectly isolated from its environment. We detect the decoherence of a superposition of two electronic ground states due to single scattering events and determine transition frequencies which are relevant for astrophysics and searches for variations of fundamental constants [30,31] with a fractional uncertainty of 5 × 10 −9 .For a simplified description of the method, consider an atom with three states. Two of these states, labeled |↑ and |↓ , which are long-lived and allow for coherent control, are used to study transitions to a third, excited state |e . After preparation in |↑ , a π/2 pulse on the |↑ → |↓ transition creates a superposition state |ψ ≡ 1 √ 2 (|↑ + |↓ ). A spectroscopy pulse probes the couplings |↑ → |e and |↓ → |e during a delay period τ . To decouple the superposition state ...

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“…The general validity of this invariance is an open question. This triggers a variety of different experiments, which aim at tests of CPT invariance by comparing the properties of matter and antimatter with highest precision [2][3][4]. Among those is the Baryon Antibaryon Symmetry Experiment (BASE), which tests CPT symmetry by comparing the magnetic moments and the charge-to-mass ratios of single protons and antiprotons in an advanced Penning-trap system [5].…”

Section: Introductionmentioning

confidence: 99%

A Test of Charge-Parity-Time Invariance at the Atto-Electronvolt Scale

Mooser

Higuchi

Smorra

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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We developed a novel fast measurement procedure for cyclotron frequency comparisons of two individual particles in a Penning trap, which enabled us to compare the charge-to-mass ratio of the proton and the antiproton with a fractional precision of 69 parts per trillion. To date this is the most precise test of charge-parity-time invariance using baryons. Our measurements were performed at cyclotron frequencies of about 30 MHz, which means that charge-parity-time symmetry holds at the atto-electronvolt scale.

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Resolving an Individual One-Proton Spin Flip to Determine a Proton Spin State

Cited by 33 publications

References 13 publications

Electron g‐factor determinations in Penning traps

Electron g‐factor determinations in Penning traps

Decoherence-Assisted Spectroscopy of a SingleMg+Ion

A Test of Charge-Parity-Time Invariance at the Atto-Electronvolt Scale

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