Dr Christopher Ballance: Publications

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

(2015)

Authors:

CJ Ballance, VM Schaefer, JP Home, DJ Szwer, SC Webster, DTC Allcock, NM Linke, TP Harty, DPL Aude Craik, DN Stacey, AM Steane, DM Lucas

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: Lasers and Optics Springer Berlin Heidelberg 114:1-2 (2014) 3-10

Authors:

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

Abstract:

We propose a surface ion trap design incorporating microwave control electrodes for near-field single-qubit control. The electrodes are arranged so as to provide arbitrary frequency, amplitude and polarization control of the microwave field in one trap zone, while a similar set of electrodes is used to null the residual microwave field in a neighbouring zone. The geometry is chosen to reduce the residual field to the 0.5% level without nulling fields; with nulling, the crosstalk may be kept close to the 0.01% level for realistic microwave amplitude and phase drift. Using standard photolithography and electroplating techniques, we have fabricated a proof-of-principle electrode array with two trapping zones. We discuss requirements for the microwave drive system and prospects for scalability to a large two-dimensional trap array.

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