Dr Christopher Ballance: Publications

High-Fidelity Preparation, Gates, Memory, and Readout of a Trapped-Ion Quantum Bit

Physical Review Letters American Physical Society (APS) 113:22 (2014) 220501

Authors:

TP Harty, DTC Allcock, CJ Ballance, L Guidoni, HA Janacek, NM Linke, DN Stacey, DM Lucas

High-fidelity two-qubit quantum logic gates using trapped calcium-43 ions

(2014)

Authors:

CJ Ballance, TP Harty, NM Linke, DM Lucas

High-fidelity preparation, gates, memory and readout of a trapped-ion quantum bit

(2014)

Authors:

TP Harty, DTC Allcock, CJ Ballance, L Guidoni, HA Janacek, NM Linke, DN Stacey, DM Lucas

Microwave control electrodes for scalable, parallel, single-qubit operations in a surface-electrode ion trap

Applied Physics B Springer Nature 114:1-2 (2014) 3-10

Authors:

DPL Aude Craik, NM Linke, TP Harty, CJ Ballance, DM Lucas, AM Steane, DTC Allcock

Injection locking of two frequency-doubled lasers with 3.2 GHz offset for driving Raman transitions with low photon scattering in ⁴³Ca+

Optics Letters 38:23 (2013) 5087-5089

Authors:

NM Linke, CJ Ballance, DM Lucas

Abstract:

We describe the injection locking of two infrared (794 nm) laser diodes that are each part of a frequency-doubled laser system. An acousto-optic modulator in the injection path gives an offset of 1.6 GHz between the lasers for driving Raman transitions between states in the hyperfine split (by 3.2 GHz) ground level of 43Ca+. The offset can be disabled for use in 40Ca+. We measure the relative linewidth of the frequency-doubled beams to be 42 mHz in an optical heterodyne measurement. The use of both injection locking and frequency doubling combines spectral purity with high optical power. Our scheme is applicable for providing Raman beams across other ion species and neutral atoms where coherent optical manipulation is required. © 2013 Optical Society of America.

51��