Superconducting quantum devices

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Strong coupling of microwave photons to antiferromagnetic fluctuations in an organic magnet

Physical Review Letters American Physical Society 119:14 (2017) 147701

Authors:

Matthias Mergenthaler, Junjie Liu, Jennifer Le Roy, Natalia Ares, Amber Thompson, Lapo Bogani, F Luis, Stephen Blundell, T Lancaster, Arzhang Ardavan, G Andrew D Briggs, Peter J Leek, Edward Laird

Abstract:

Coupling between a crystal of di(phenyl)-(2,4,6-trinitrophenyl)iminoazanium (DPPH) radicals and a superconducting microwave resonator is investigated in a circuit quantum electrodynamics (cQED) architecture. The crystal exhibits paramagnetic behavior above 4 K, with antiferromagnetic correlations appearing below this temperature, and we demonstrate strong coupling at base temperature. The magnetic resonance acquires a field angle dependence as the crystal is cooled down, indicating anisotropy of the exchange interactions. These results show that multi-spin modes in organic crystals are suitable for cQED, offering a platform for their coherent manipulation. They also utilize the cQED architecture as a way to probe spin correlations at low temperature.
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Dual-Mode Dual-Band Conductor-Loaded Dielectric Resonator Filters

Institute of Electrical and Electronics Engineers (IEEE) (2017) 908-910

Authors:

Mustafa S Bakr, Saad WO Luhaib, Ian C Hunter, Wolfgang Bosch
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Multipath-Assisted Indoor Positioning Enabled by Directional UWB Sector Antennas

Institute of Electrical and Electronics Engineers (IEEE) (2017) 1-5

Authors:

Michael Rath, Josef Kulmer, Mustafa S Bakr, Bernhard Groβwindhager, Klaus Witrisal
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Double-sided coaxial circuit QED with out-of-plane wiring

APPLIED PHYSICS LETTERS 110:22 (2017) ARTN 222602

Authors:

J Rahamim, T Behrle, MJ Peterer, A Patterson, PA Spring, T Tsunoda, R Manenti, G Tancredi, PJ Leek
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A TE11 dual-mode monoblock dielectric resonator filter

Asia-Pacific Microwave Conference Proceedings, APMC 0 (2017)

Authors:

MS Bakr, IC Hunter, F Gentili, W Bosch

Abstract:

A novel TE11 monoblock dual-mode dielectric resonator filter is presented in this paper. The proposed filter is made of a single piece of ceramic with silver plated external surfaces and metallic lids for hosting tuning elements. The dominant TE11 dual-mode is supported by H-shape dielectric resonator having ϵr =45. The resonator is ultra-compact in size and offers a maximized space utilization since no metallic housing is required. In addition, the proposed resonator offers a high unloaded quality factor, reasonably wide spurious window and lend itself to implement tunability. One prototype filter operating at 1.96 GHz with 50-MHz bandwidth is designed.
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