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

Joseph Thom; Ben Yuen; Guido  Wilpers; Erling Riis; Alastair G. Sinclair

doi:10.1007/s00340-018-6955-4

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

Joseph Thom, Ben Yuen, Guido Wilpers, Erling Riis, Alastair G. Sinclair

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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.

Original language	English
Number of pages	12
Journal	Applied Physics B: Lasers and Optics
Volume	124
Issue number	90
Early online date	3 May 2018
DOIs	https://doi.org/10.1007/s00340-018-6955-4
Publication status	E-pub ahead of print - 3 May 2018

Keywords

optical pulse
ions
laser-driven qubits

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10.1007/s00340-018-6955-4

Thom-etal-APBLO2018-Intensity-stabilisation-of-optical-pulse-sequences-for-coherentAccepted author manuscript, 1.77 MB

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title = "Intensity stabilisation of optical pulse sequences for coherent control of laser-driven qubits",

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.",

keywords = "optical pulse, ions, laser-driven qubits",

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AU - Thom, Joseph

AU - Yuen, Ben

AU - Wilpers, Guido

AU - Riis, Erling

AU - Sinclair, Alastair G.

N1 - This is a post-peer-review, pre-copyedit version of an article published in Applied Physics B: Lasers and Optics. The final authenticated version is available online at: https://doi.org/10.1007/s00340-018-6955-4.

PY - 2018/5/3

Y1 - 2018/5/3

N2 - 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.

AB - 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.

KW - optical pulse

KW - ions

KW - laser-driven qubits

UR - https://link.springer.com/journal/340

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DO - 10.1007/s00340-018-6955-4

M3 - Article

VL - 124

JO - Applied Physics B: Lasers and Optics

JF - Applied Physics B: Lasers and Optics

SN - 0946-2171

IS - 90

ER -

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

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