Unidirectional distributed acoustic reflection transducers for quantum applications
Abstract
Recent significant advances in coupling superconducting qubits to acoustic wave resonators have led to demonstrations of quantum control of surface and bulk acoustic resonant modes as well as Wigner tomography of quantum states in these modes. These advances were achieved through the efficient coupling afforded by piezoelectric materials combined with GHz-frequency acoustic Fabry-Perot cavities. Quantum control of “itinerant” surface acoustic waves appears in reach but is challenging due to the limitations of conventional transducers in the appropriate gigahertz-frequency band. In particular, gigahertz-frequency unidirectional transducers would provide an important addition to the desired quantum toolbox, promising unit efficiency with directional control over the surface acoustic wave emission pattern. Here, we report the design, fabrication, and experimental characterization of unidirectional distributed acoustic reflection transducers demonstrating a high transduction frequency of 4.8 GHz with a peak directivity larger than 25 dB and a directivity greater than 15 dB over a bandwidth of 17 MHz. A numerical model reproduces the main features of the transducer response quite well, with ten adjustable parameters (most of which are constrained by geometric and physical considerations). This represents a significant step toward quantum control of itinerant quantum acoustic waves.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 03, 2019
- Source ID
- 10.1063/1.5099095
Entities
People
- A. Bienfait
- A. N. Cleland
- C. R. Conner
- Etienne Dumur
- G. A. Peairs
- H-S Chang
- J. Grebel
- Kevin J Satzinger
- Ming-han Chou
- Rhys G Povey
- Y. P. Zhong
Organizations
- Argonne National Laboratory
- National Science Foundation
- United States Air Force
- United States Army Research Laboratory
- United States Department of Energy
- University of Chicago