A GHz-frequency multistrip acoustic beam splitter for quantum applications
Abstract
We demonstrate a microwave-frequency, two-track acoustic beam splitter, based on a multistrip coupler design matched to four unidirectional transducers, two on each of the two acoustic tracks that make up the device. We explain the device design and its experimental implementation, showing good agreement between our model and the measured device scattering spectra. The beam splitter regime, dividing an input signal at port 1 into closely equal outputs at ports 2 and 3, is reached over a 94.7 MHz bandwidth centered at 4.79 GHz, with an output power division ratio |S21/S₃₁|2 = 1.1 ± 0.2. The measured bandwidth of the device is limited by the bandwidth of the transducers, rather than that of the multistrip coupler.
Copyright and License
Acknowledgement
Devices and experiments were supported by the Air Force Office of Scientific Research under Award No. FA9550-20-1-0270 and the Army Research Office under Grant No. W911NF-23-1-0077, with additional support from the Department of Energy (DOE) under Contract No. IF-60579. K.J.S. was supported by NSF GRFP (NSF DGE-1144085), and A.N.C. was supported by the DOE, Office of Basic Energy Sciences. This work was partially supported by the UChicago MRSEC (NSF DMR-1420709) and made use of the Pritzker Nanofabrication Facility, which receives support from SHyNE, a node of the National Science Foundation's National Nanotechnology Coordinated Infrastructure (NNCI ECCS-2025633).
Contributions
Étienne Dumur: Conceptualization (lead); Investigation (lead); Methodology (lead); Software (equal); Validation (equal); Visualization (equal); Writing – original draft (lead); Writing – review & editing (equal). Youpeng Zhong: Investigation (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Andrew N. Cleland: Funding acquisition (lead); Methodology (equal); Project administration (lead); Supervision (lead); Writing – original draft (equal); Writing – review & editing (lead). Kevin J. Satzinger: Investigation (equal); Methodology (equal); Software (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Greg A. Peairs: Investigation (equal); Software (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Ming-Han Chou: Investigation (equal); Software (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Audrey Bienfait: Investigation (equal); Software (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Hung-Shen Chang: Investigation (equal); Software (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Christopher R. Conner: Investigation (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Joel Grebel: Investigation (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal). Rhys G. Povey: Investigation (equal); Validation (equal); Visualization (equal); Writing – review & editing (equal).
Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
See the supplementary material for additional details for the experiment and modeling.
Conflict of Interest
The authors have no conflicts to disclose.
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Additional details
- ISSN
- 1077-3118
- FA9550-20-1-0270
- United States Air Force Office of Scientific Research
- W911NF-23-1-0077
- United States Army Research Office
- IF-60579
- United States Department of Energy
- NSF Graduate Research Fellowship DGE-1144085
- National Science Foundation
- DMR-1420709
- National Science Foundation
- ECCS-2025633
- National Science Foundation
- Caltech groups
- AWS Center for Quantum Computing