Integrated Microwave Acoustics/Phononics

Acoustic devices have been used in microwave signal processing for decades and recently become a promising interface for on-chip quantum information. On the pathway to large-scale acoustic processors, We demonstrated high-Q gigahertz acoustic resonators, nonreciprocal acoustic transmission using parity-time (PT) symmetric resonators, and integrated electro-acoustic modulators on lithium niobate platform.

L. Shao, et al., Nature Electronics 5, 348–355 (2022).
L. Shao, et al., Nature Electronics 3, 267-272 (2020).

Electro-acoustic devices mount on a PCB.

Integrated Lithium Niobate Acousto-optics

Acousto-optic devices provide state-of-the-art performance in optical modulation and frequency shifting. However, conventional acousto-optic devices use bulk elements, consume a few watts of radio frequency power, and mostly operate at sub-GHz frequencies. We developed integrated acousto-optic devices that enable microwave-to-optical conversions and gigahertz optical frequency shifting.

L. Shao, et al., Optica 6, 1498-1505 (2019).
L. Shao, et al., Opt. Express 28, 23728-23738 (2020).

Acousto-optic on suspended LN platform
Driving SiV in diamond using acoustic waves

Quantum Control and Sensing using Diamond Color Centers

Diamond color centers, such as SiV, feature long coherent time of their electron spin states and are thus promising candidates for quantum storage. However, conventional magnetic driving of electron spins is inefficient due to the huge mismatch between the electromagnetic wavelength and the atomic size of defect centers. Thanks to the strong spin-orbital coupling for diamond color centers, we achieved efficient acoustic control of SiV centers and working on a phononic network connecting multiple SiV centers.

S. Maity, L. Shao, et al., Nature Communications 11, 193 (2020).