INAS QUANTUM DOTS AND SURFACE ACOUTSIC WAVE CAVITIES FOR QUANTUM TRANSDUCTION

Quantum information technology based on superconducting microwave technology is progressing rapidly and is now widely adopted by large corporations and small startup firms. These components operate at ~20mK temperatures. An emerging problem is the transfer of quantum information out of and into the cryostat. Recently, hybrid quantum devices involving SAW cavities and superconducting qubits have been successfully integrated [1].

We present progress on a new type of transducer involving an InAs quantum dot and coupled to surface acoustic wave cavity (SAWc). In a SAWc, phonons will parametrically modify the resonance frequency of a QD via strain [2]]. In this work, we demonstrate progress in developing state-of-the-art, stable SAWc operating at ~ 3.4GHz. We demonstrate a reduction in the SAWc mode volume by using focusing SAW mirrors. These devices are characterized using near-field microwave measurements of SAWc cavity-modes demonstrating high-quality focusing phononic wavefronts. Finally, we discuss reducing bulk scattering, theoretical coupling rates and discuss efficient photon extraction.

References
[1] K. J. Satzinger, et al., Nature, 2018, 563, 661.
[2] M. Metcalfe, S.M. Carr, A. Muller, G.S. Solomon, and J.Lawall, Physical Review Letters, 2010, 105, 037401