Ion dynamics in a novel linear combined trap

Eijkelenborg, Martijn A. van; Storkey, M.E.M; Segal, D. M.; Thompson, Richard C.

doi:10.1016/s1387-3806(99)00021-4

Cited by 13 publications

(6 citation statements)

References 18 publications

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“…The cavities are constructed from Zerodur and are tunable via piezo transducers arranged in a re-entrant design to minimize thermal drift. The trap itself (Figure 4) was first described in [31] and is housed in a vacuum chamber kept at ultra-high vacuum (10 −9 mbar or lower). It approximates an ideal Pen- …”

Section: A Laser Systemsmentioning

confidence: 99%

“…The trap itself (Figure 4) was first described in [31] and is housed in a vacuum chamber kept at ultra-high vacuum (10 −9 mbar or lower). It approximates an ideal Pen- In the work described below, the axialization drive and the dipolar excitation signal are provided by high-resolution function generators, allowing the determination of relevant frequencies to 1 Hz or better.…”

Section: B Trap With Segmented Ring Electrodementioning

confidence: 99%

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Dynamics of axialized laser-cooled ions in a Penning trap

et al. 2008

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We report the experimental characterization of axialization -a method of reducing the magnetron motion of a small number of ions stored in a Penning trap. This is an important step in the investigation of the suitability of Penning traps for quantum information processing. The magnetron motion was coupled to the laser-cooled modified cyclotron motion by the application of a nearresonant oscillating quadrupole potential (the "axialization drive"). Measurement of cooling rates of the radial motions of the ions showed an order-of-magnitude increase in the damping rate of the magnetron motion with the axialization drive applied. The experimental results are in good qualitative agreement with a recent theoretical study. In particular, a classical avoided crossing was observed in the motional frequencies as the axialization drive frequency was swept through the optimum value, proving that axialization is indeed a resonant effect.

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Section: A Laser Systemsmentioning

confidence: 99%

Section: B Trap With Segmented Ring Electrodementioning

confidence: 99%

Dynamics of axialized laser-cooled ions in a Penning trap

et al. 2008

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“…The trap is described in Ref. [18]. Laser light passes through the trap via holes cut into the ring electrode, and light from the ions emerges from a hole also cut in the ring.…”

Section: Volume 89 Number 9 P H Y S I C a L R E V I E W L E T T E R mentioning

confidence: 99%

Axialization of Laser Cooled Magnesium Ions in a Penning Trap

Powell

Segal²,

Thompson³

2002

Phys. Rev. Lett.

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We report the first demonstration of the axialization of laser cooled ions in a Penning trap. Axialization involves the application of a small radial quadrupole drive which couples the cyclotron and magnetron motions. This enhances the laser cooling, allowing tighter confinement of the ions to the central axis of the trap than is otherwise possible. Using an intensified charge-coupled device (ICCD) camera we have imaged the axialization process for the first time. For a single ion, we recorded a large decrease of the magnetron amplitude corresponding to a reduction in ion temperature of approximately 2 orders of magnitude to an upper limit of order 10 mK. We have discovered dynamics specific to the laser cooled system which depend critically on the axial drive frequency and amplitude. DOI: 10.1103/PhysRevLett.89.093003 PACS numbers: 32.80.Pj, 03.67.Lx, 41.20.-q, 42.50.Vk With the growing interest in quantum information processing there has been an increasing need to develop technology which might enable the implementation of the ideas proposed. The uniquely stable and isolated environment of the ion trap makes it an ideal tool for the investigation of quantum phenomena; indeed, ion traps have been placed at the forefront of advances in the area of quantum information science [1]. Recent experiments include the entanglement of four trapped ions, the building of a CNOT gate and quantum state engineering using a single particle [2][3][4].Very low temperatures can be reached in ion traps using laser cooling, but the minimum temperature can be limited by the nature of the trapping method itself. The two most widely used types of ion trap are the Paul (radio frequency) trap and the Penning trap [5]. For radial confinement, the former uses an electric field oscillating at a radio frequency, while the latter uses a static magnetic field. This means that in the Paul trap the ion motion is simple harmonic in all directions but in the radial plane of the Penning trap the action of the combined electric and magnetic fields results in a more complex orbital motion: a superposition of two rotations, the magnetron and the cyclotron rotations.Until now much work in the area of quantum information science has focused on the use of linear Paul traps which allow the preparation of stationary strings of ions and strong confinement to the Lamb-Dicke regime [1]. Unfortunately, the low temperature limit of the Paul trap can be affected by the ''micromotion'' of the trapped ions, which arises as a result of the trapping field and cannot be completely avoided. The Penning trap has no such limitation [5]. However, the nature of the motion in the radial plane of the Penning trap complicates the laser cooling process [6,7]. Specifically, it is difficult to achieve small magnetron radii. Problems arise because the magnetron motion is unstable: its total energy is negative so energy must be supplied in order to reduce the magnetron radius.Three frequencies govern the motion of ions in a Penning trap. The first is ! z , which describes th...

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“…One area that Danny was particularly interested in was the design and operation of novel types of ion trap. After the study of the combined trap, he designed a series of new traps used for different purposes, including an investigation of the effect of perturbations of the trapping field in traps [6] and the characterisation of a linear variant of the combined trap [7].…”

Section: Advanced Fellowship Awardmentioning

confidence: 99%

Professor Danny Segal – scientist and scholar

Thompson

2017

Journal of Modern Optics

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Professor Danny Segal (1960-2015) was a talented scientist who worked at Imperial College London for nearly twenty five years until his untimely death in 2015. His main research interest was in the area of spectroscopy and laser cooling of trapped ions in Penning traps, but he was also active in the wider ion trap and quantum optics communities in Europe and made many contributions beyond his research activities to the Physics Department at Imperial.

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Ion dynamics in a novel linear combined trap

Cited by 13 publications

References 18 publications

Dynamics of axialized laser-cooled ions in a Penning trap

Dynamics of axialized laser-cooled ions in a Penning trap

Axialization of Laser Cooled Magnesium Ions in a Penning Trap

Professor Danny Segal – scientist and scholar

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