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

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 > 10 4 ) and position of the focused beam at the ion. The fractiona...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2018-05, Vol.124 (5), p.1-12, Article 90
Main Authors: Thom, Joseph, Yuen, Ben, Wilpers, Guido, Riis, Erling, Sinclair, Alastair G.
Format: Article
Language:English
Subjects:
Applied physics
Control stability
Dynamic stability
Engineering
Ion beams
Lasers
Logic circuits
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Optics
Qubits (quantum computing)
Sequences
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Summary: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 > 10 4 ) 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   μ m for a 45  μ m 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.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-018-6955-4