Intensity stabilisation of optical pulse sequences for coherent control of laser-driven qubits

Thom, Joseph and Yuen, Ben and Wilpers, Guido and Riis, Erling and Sinclair, Alastair G. (2018) Intensity stabilisation of optical pulse sequences for coherent control of laser-driven qubits. Applied Physics B: Lasers and Optics, 124 (90). ISSN 0946-2171

[img]
Preview
Text (Thom-etal-APBLO2018-Intensity-stabilisation-of-optical-pulse-sequences-for-coherent)
Thom_etal_APBLO2018_Intensity_stabilisation_of_optical_pulse_sequences_for_coherent.pdf
Accepted Author Manuscript

Download (1MB)| Preview

    Abstract

    We demonstrate a system for intensity stabilisation of optical pulse sequences used in laser-driven quantum control of trapped ions. Intensity instability is minimised by active stabilisation of the power (over a dynamic range of > 104 ) and position of the focused beam at the ion. The fractional Allan deviations in power were found to be < 2.2 × 10−4 for averaging times from 1 to 16,384 s. Over similar times, the absolute Allan deviation of the beam position is < 0.1 μm for a 45 μm beam diameter. Using these residual power and position instabilities, we estimate the associated contributions to infidelity in example qubit logic gates to be below 10−6 per gate.