Entanglement generation in trapped-ion systems has relied thus far on two distinct but related geometric phase gate techniques: Molmer-Sorensen and light-shift gates. We recently proposed a variant of the scheme where qubit levels are separated by an optical frequency [B. C. Sawyer K. R. Brown, Phys. Rev. A 103, 022427 (2021)]. Here we report experimental demonstration this entangling using pair $^{40}$Ca$^+$ ions cryogenic surface-electrode ion trap commercial, high-power, 532 nm Nd:YAG...

We describe a novel approach to directly measure the energy of narrow, low-lying isomeric state in 229Th. Since nuclear transitions are far less sensitive environmental conditions than atomic transitions, we argue that 229Th optical transition may be driven inside host crystal with high Q. This technique might also allow for construction solid-state frequency reference surpasses short-term stability current clocks, as well improved limits on variability fundamental constants. Based analysis...

Ultracold 174Yb+ ions and 40Ca atoms are confined in a hybrid trap. The charge exchange chemical reaction rate constant between these two species is measured found to be 4 orders of magnitude larger than recent measurements other heteronuclear systems. structure the CaYb+ molecule determined used calculation that explains fast as consequence strong radiative transfer. A possible explanation offered for apparent contradiction typical theoretical predictions association process this experiments.

We report the results of a direct search for (229)Th (I(π)=3/2(+)←5/2(+)) nuclear isomeric transition, performed by exposing (229)Th-doped LiSrAlF(6) crystals to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence. also use existing physics data establish range possible transition strengths transition. find no evidence thorium between 7.3 eV 8.8 with lifetime (1-2) s≲τ≲(2000-5600) s. This measurement excludes roughly half favored area can be used future searches.

The role of electronic excitation in charge exchange chemical reactions between ultracold Ca atoms and Ba$^+$ ions, confined a hybrid trap, is studied. This prototypical system energetically precluded from reacting its ground state, allowing particularly simple interpretation the influence excitation. It found that while ion can critically reaction rate, neutral atom less important. also experimentally demonstrated with correct choice atom-ion pair, it possible to mitigate unwanted effects...

We demonstrate the integration of a linear quadrupole trap with simple time-of-flight mass spectrometer medium-mass resolution (m/Δm ∼ 50) geared towards demands atomic, molecular, and chemical physics experiments. By utilizing novel radial ion extraction scheme from into analyzer, device large capacity high optical access is realized without sacrificing resolution. This provides ability to address trapped ions laser light facilitates interactions neutral background gases prior analyzing...

We present data that show a cycling transition can be used to detect and image metastable ${\mathrm{He}}_{2}$ triplet molecules in superfluid helium. demonstrate limitations on the efficiency due vibrational structure of molecule mitigated by use repumping lasers. Images obtained using method are also shown. This technique gives rise new kind ionizing radiation detector. The as tracer particles promises powerful tool for visualization both quantum classical turbulence liquid

A new two parameter formula for yrast energies, which works best soft rotors or transitional nuclei, is proposed and compared with existing data.Received 13 November 2003DOI:https://doi.org/10.1103/PhysRevC.69.044314©2004 American Physical Society

The formation of (40)Ca(2)(+) molecular ions is observed in a hybrid (40)Ca magneto-optical and ion trap system. process determined to be photo-associative ionization ultracold atoms. A lower bound for the two-body rate constant found beta ≥ 2 ± 1 × 10(-15) cm(3) Hz. Ab initio potential curves are calculated neutral Ca(2) ionic Ca(2)(+) molecules used model that identifies pathway. As this technique does not require separate photo-association laser, it could find use as simple, robust method...

We demonstrate a simple technique for molecular ion spectroscopy. BaCl$^+$ ions are trapped in linear Paul trap the presence of room-temperature He buffer gas and photodissociated by driving an electronic transition from ground X$^1\Sigma^+$ state to repulsive wall A$^1\Pi$ state. The photodissociation spectrum is recorded monitoring induced loss as function excitation wavelength. Accurate potentials spectroscopic constants determined. Comparison theoretical cross-sections with measurement...

Ion transport is an essential operation in some models of quantum information processing, where fast ion shuttling with minimal motional excitation necessary for efficient, high-fidelity logic. While and cold has been demonstrated, the dynamics specific trajectory during diabatic have not studied detail. Here we describe a position-dependent optical deshelving technique useful sampling ion's position throughout its trajectory, demonstrate on linear $^{40}\text{Ca}^+$ surface-electrode trap....

We have recently described a novel method for the construction of solid-state optical frequency reference based on doping $^{229}$Th into high energy band-gap crystals. Since nuclear transitions are far less sensitive to environmental conditions than atomic transitions, we argued that transition may be driven inside host crystal resulting in an with short-term stability $3\times10^{-17}<\Delta f/f <1\times10^{-15}$ at 1 s and systematic-limited repeatability $\Delta \sim 2 \times 10^{-16}$....

Samples of ultracold 174 Yb+ ions, confined in a linear radio-frequency Paul trap, are heated via self-induced micromotion interruption, while their temperature, density, and therefore structural phase monitored simulated. The observed time evolution the ion temperature is compared to theoretical model for ion-ion heating allowing direct measurement Coulomb logarithm trap. This result permits simple, yet accurate, analytical description cloud thermodynamic properties, e.g. phase, as well...

A low-threshold solid-state UV laser using a whispering gallery mode (WGM) resonator constructed from transparent crystalline material is demonstrated. Using Ce3+:LiCaAlF6 resonator, we observe broad bandwidth lasing (280-330 nm) with low threshold intensity of 7.5×10(9) W/m(2) and an effective slope efficiency ~25%. The time delay dynamics in the pulsed operation are also observed analyzed. Additionally, LiCaAlF(6) WGM Q=2×10(7) at 370 nm realized. combination this high Q small volume...

We describe an approach to detecting ionizing radiation that combines the special properties of superfluid helium with sensitivity quantum optics techniques. Ionization in liquid results copious production metastable He2 molecules, which can be detected by laser-induced fluorescence. Each molecule probed many times using a cycling transition, resulting detection individual molecules high signal noise. This technique could used detect neutrinos, weakly interacting massive particles, and...

We report the design and experimental demonstration of a compact, reconfigurable Penning ion trap constructed with rare-earth permanent magnets placed outside vacuum enclosure. describe first observation Doppler laser cooling ions in magnet trap. detail method for quantifying optimizing magnetic field uniformity situ using thermal beam neutral $^{40}$Ca precursor atoms. $^{40}$Ca$^+$ is carried out at 0.65~T, side-view images trapped fluorescence show crystalline order both two-...

In this paper, we report a MEMS preconcentrator (PC) -gas chromatograph (GC) that is crucial part of the Spacecraft Atmosphere Monitor (S.A.M.).The S.A.M. highly miniature gas -mass spectrometer (GC-MS) for monitoring atmosphere crewed spacecraft both trace organic compounds and major constituents cabin air.The instrument next generation GC-MS, based on JPL's Vehicle Cabin Air (VCAM), which was launched to International Space Station (ISS) in April 2010 successfully operated two years...

Theoretical works by Barnes and Nebel [R. A. D. C. Barnes, Fusion Technol. 38, 28 (1998); R. Nebel, Phys. Plasmas 5, 2498 (1998)] have suggested that a tiny oscillating ion cloud may undergo self-similar collapse in harmonic oscillator potential formed uniform electron background. By tuning the external radio-frequency electric fields to this naturally occurring mode, it is then possible heat ions obtain very high densities temperatures simultaneously during phase of oscillation through...