D. N. Stacey

Isotope-selective photoionization for calcium ion trapping

We present studies of resonance-enhanced photoionization for isotope-selective loading of

Deterministic entanglement and tomography of ion–spin qubits

{\mathrm{Ca}}^{+}

Long-lived mesoscopic entanglement outside the Lamb-Dicke regime.

into a Paul trap. The

Measurement of the lifetime of the 3 d 2 D 5 / 2 state in 40 Ca +

{4s}^{2}{}^{1}{S}_{0}\ensuremath{\leftrightarrow}4s4p{}^{1}{P}_{1}

Hybrid quantum logic and a test of Bell’s inequality using two different atomic isotopes

transition of neutral calcium is driven by a 423 nm laser and the atoms are photoionized by a second laser at 389 nm. Isotope selectivity is achieved by using crossed atomic and laser beams to reduce the Doppler width significantly below the isotope shifts in the 423 nm transition. The loading rate of ions into the trap is studied under a range of experimental parameters for the abundant isotope

Isotope shift in xenon by Doppler-free two-photon laser spectroscopy

{}^{40}{\mathrm{Ca}}^{+}.

Oxford ion-trap quantum computing project

Using the fluorescence of the atomic beam at 423 nm as a measure of the Ca number density, we estimate a lower limit for the absolute photoionization cross section of 170(60) Mb. We achieve loading and laser cooling of all the naturally occurring isotopes, without the need for enriched sources. Laser heating/cooling is observed to enhance the isotope selectivity. In the case of the rare species

Linear absorption measurements of pressure broadening in neon

{}^{43}{\mathrm{Ca}}^{+}

Hyperfine structure, pressure shift and pressure broadening in the 648 nm transition of atomic bismuth by Faraday spectroscopy

and

Optical Bloch equations with multiply connected states

{}^{46}{\mathrm{Ca}}^{+},