Surface acoustic wave unidirectional transducers for quantum applications

Abstract

The conversion efficiency of electric microwave signals into surface acoustic waves in different types of superconducting transducers is studied with the aim of quantum applications. We compare delay lines containing either conventional symmetric transducers (IDTs) or unidirectional transducers (UDTs) at 2.3 GHz and 10 mK. The UDT delay lines improve the insertion loss with 4.7 dB and a directivity of 22 dB is found for each UDT, indicating that 99.4 % of the acoustic power goes in the desired direction. The power lost in the undesired direction accounts for more than 90 % of the total loss in IDT delay lines, but only ~3 % percent of the total loss in the FEUDT delay lines.

4 pages (5 including references), 3 figures

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• Cavity-free vacuum-Rabi splitting in circuit quantum acoustodynamics
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• Generation of a single-cycle acoustic pulse: a scalable solution for transport in single-electron circuits
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• Chiral phonons and phononic birefringence in ferromagnetic metal - bulk acoustic resonator hybrids
• Electron qubits surfing on acoustic waves: review of recent progress
• Directional emission in an on-chip acoustic waveguide
• Minimally-diffracting quartz for ultra-low temperature surface acoustic wave resonators
• Approaching optimal microwave-acoustic transduction on lithium niobate using SQUID arrays
• Manipulation of magnetic systems by quantized surface acoustic wave via piezomagnetic effect
• Light modulation in Silicon photonics by PZT actuated acoustic waves
• Chiral quantum optics with giant atoms
• Direct Visualization of Gigahertz Acoustic Wave Propagation in Suspended Phononic Circuits
• Suppression of Electromagnetic Crosstalk by Differential Excitation for SAW Generation