D. Kielpinski and M. G. Pullen
Centre for Quantum Dynamics, Griffith University, Brisbane, Australia
J. Canning and M. Stevenson
Interdisciplinary Photonics Laboratories (iPL), School of Chemistry, University of Sydney, Sydney, Australia
P. S. Westbrook and K. S. Feder
OFS Laboratories, Somerset, New Jersey, USA
Optics Express 17, 20833 (2009)
Abstract: We generate mode-locked picosecond pulses near 1110 nm
by spectrally slicing and reamplifying an octave-spanning supercontinuum
source pumped at 1550 nm. The 1110 nm pulses are near transform-limited,
with 1.7 ps duration over their 1.2 nm bandwidth, and exhibit high interpulse
coherence. Both the supercontinuum source and the pulse synthesis system
are implemented completely in fiber. The versatile source construction
suggests that pulse synthesis from sliced supercontinuum may be a useful
technique across the 1000 - 2000 nm wavelength range.
Friday, November 6, 2009
Friday, June 5, 2009
Recent publications
Frequency stabilization of an ultraviolet laser to ions in a discharge
E. W. Streed, T. J. Weinhold, and D. Kielpinski
Appl Phys Lett 93, 071103 (2008)
Abstract: We stabilize an ultraviolet diode laser system at 369.5 nm to the optical absorption signal from Yb+ ions in a hollow-cathode discharge lamp. The error signal for stabilization is obtained by Zeeman spectroscopy of the 3 GHz wide absorption feature. The frequency stability is independently measured by comparison to the fluorescence signal from a laser-cooled crystal of 174Yb+ ions in a linear Paul trap. We measure a frequency fluctuation of 1.7 MHz over 1000 s and a frequency drift of 20 MHz over 7 days. Our method is suitable for use in quantum information processing experiments with trapped ion crystals.
Scalable, Efficient Ion-Photon Coupling With Phase Fresnel Lenses For Large-Scale Quantum Computing
E.W. Streed, B.G. Norton, J.J. Chapman, and D. Kielpinski
Quant Inform Comp 9, 0203 (2009)
Abstract: Efficient ion-photon coupling is an important component for large-scale ion-trap quantum computing. We propose that arrays of phase Fresnel lenses (PFLs) are a favorable optical coupling technology to match with multi-zone ion traps. Both are scalable technologies based on conventional micro-fabrication techniques. The large numerical apertures (NAs) possible with PFLs can reduce the readout time for ion qubits. PFLs also provide good coherent ion-photon coupling by matching a large fraction of an ion’s emission pattern to a single optical propagation mode (TEM00). To this end we have optically characterized a large numerical aperture phase Fresnel lens (NA=0.64) designed for use at 369.5 nm, the principal fluorescence detection transition for Yb+ ions. A diffraction-limited spot w0 = 350 ± 15 nm (1/e2 waist) with mode quality M2 = 1.08 ± 0.05 was measured with this PFL. From this we estimate the minimum expected free space coherent ion-photon coupling to be 0.64%, which is twice the best previous experimental measurement using a conventional multi-element lens. We also evaluate two techniques for improving the entanglement fidelity between the ion state and photon polarization with large numerical aperture lenses.
E. W. Streed, T. J. Weinhold, and D. Kielpinski
Appl Phys Lett 93, 071103 (2008)
Abstract: We stabilize an ultraviolet diode laser system at 369.5 nm to the optical absorption signal from Yb+ ions in a hollow-cathode discharge lamp. The error signal for stabilization is obtained by Zeeman spectroscopy of the 3 GHz wide absorption feature. The frequency stability is independently measured by comparison to the fluorescence signal from a laser-cooled crystal of 174Yb+ ions in a linear Paul trap. We measure a frequency fluctuation of 1.7 MHz over 1000 s and a frequency drift of 20 MHz over 7 days. Our method is suitable for use in quantum information processing experiments with trapped ion crystals.
Scalable, Efficient Ion-Photon Coupling With Phase Fresnel Lenses For Large-Scale Quantum Computing
E.W. Streed, B.G. Norton, J.J. Chapman, and D. Kielpinski
Quant Inform Comp 9, 0203 (2009)
Abstract: Efficient ion-photon coupling is an important component for large-scale ion-trap quantum computing. We propose that arrays of phase Fresnel lenses (PFLs) are a favorable optical coupling technology to match with multi-zone ion traps. Both are scalable technologies based on conventional micro-fabrication techniques. The large numerical apertures (NAs) possible with PFLs can reduce the readout time for ion qubits. PFLs also provide good coherent ion-photon coupling by matching a large fraction of an ion’s emission pattern to a single optical propagation mode (TEM00). To this end we have optically characterized a large numerical aperture phase Fresnel lens (NA=0.64) designed for use at 369.5 nm, the principal fluorescence detection transition for Yb+ ions. A diffraction-limited spot w0 = 350 ± 15 nm (1/e2 waist) with mode quality M2 = 1.08 ± 0.05 was measured with this PFL. From this we estimate the minimum expected free space coherent ion-photon coupling to be 0.64%, which is twice the best previous experimental measurement using a conventional multi-element lens. We also evaluate two techniques for improving the entanglement fidelity between the ion state and photon polarization with large numerical aperture lenses.
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