Robert Scholten

Interplay between geometric and dynamic phases in a single-spin system

AA Wood, K Streltsov, RM Goldblatt, MB Plenio, LCL Hollenberg, RE Scholten, AM Martin

Journal article  |  2020  |  Physical Review B: Condensed Matter and Materials Physics

We use a combination of microwave fields and free precession to drive the spin of a nitrogen-vacancy (NV) center in diamond on dif..

Observation of a Quantum Phase from Classical Rotation of a Single Spin

AA Wood, LCL Hollenberg, RE Scholten, AM Martin

Journal article  |  2020  |  Physical Review Letters

The theory of angular momentum connects physical rotations and quantum spins together at a fundamental level. Physical rotation of..

T-2-limited sensing of static magnetic fields via fast rotation of quantum spins

AA Wood, AG Aeppli, E Lilette, YY Fein, A Stacey, LCL Hollenberg, RE Scholten, AM Martin

Journal article  |  2018  |  PHYSICAL REVIEW B

Diamond-based quantum magnetometers are more sensitive to oscillating (ac) magnetic fields than static (dc) fields because the cry..

Quantum measurement of a rapidly rotating spin qubit in diamond

Alexander A Wood, Emmanuel Lilette, Yaakov Y Fein, Nikolas Tomek, Liam P McGuinness, Lloyd CL Hollenberg, Robert E Scholten, Andy M Martin

Journal article  |  2018  |  Science Advances

A controlled qubit in a rotating frame opens new opportunities to probe fundamental quantum physics, such as geometric phases in p..

Heralded ions via ionization coincidence

AJ McCulloch, RW Speirs, SH Wissenberg, RPM Tielen, BM Sparkes, RE Scholten

Journal article  |  2018  |  PHYSICAL REVIEW A

We demonstrate a method for the deterministic production of single ions by exploiting the correlation between an electron and asso..

Time-resolved brightness measurements by streaking

Joshua S Torrance, Rory W Speirs, Andrew J McCulloch, Robert E Scholten

Journal article  |  2018  |  PHYSICAL REVIEW ACCELERATORS AND BEAMS

Brightness is a key figure of merit for charged particle beams, and time-resolved brightness measurements can elucidate the proces..

Magnetic pseudo-fields in a rotating electron-nuclear spin system

AA Wood, E Lilette, YY Fein, VS Perunicic, LCL Hollenberg, RE Scholten, AM Martin

Journal article  |  2017  |  Nature Physics

Analogous to the precession of a Foucault pendulum observed on the rotating Earth, a precessing spin observed in a rotating frame ..

Field ionization of Rydberg atoms for high-brightness electron and ion beams

AJ McCulloch, RW Speirs, J Grimmel, BM Sparkes, D Comparat, RE Scholten

Journal article  |  2017  |  PHYSICAL REVIEW A

We present an ionization mechanism for use in a cold atom electron source with the goal of producing highly monochromatic electron..

Identification of competing ionization processes in the generation of ultrafast electron bunches from cold-atom electron sources

Rory W Speirs, Andrew J McCulloch, Ben M Sparkes, Robert E Scholten

Journal article  |  2017  |  Physical Review A: Atomic, Molecular and Optical Physics

We make direct measurements of the duration of ultrafast cold-electron bunches produced by photoionization of laser-cooled atoms. ..

Suppression of Emittance Growth Using a Shaped Cold Atom Electron and Ion Source

DJ Thompson, D Murphy, RW Speirs, RMW van Bijnen, AJ McCulloch, RE Scholten, BM Sparkes

Journal article  |  2016  |  PHYSICAL REVIEW LETTERS

We demonstrate precise control of charged particle bunch shape with a cold atom electron and ion source to create bunches with lin..