Papers by Michael Choquer
Journal of Physics D: Applied Physics
We report on scalable heterointegration of superconducting electrodes and epitaxial semiconductor... more We report on scalable heterointegration of superconducting electrodes and epitaxial semiconductor quantum dots (QDs) on strong piezoelectric and optically nonlinear lithium niobate. The implemented processes combine the sputter-deposited thin film superconductor niobium nitride and III–V compound semiconductor membranes onto the host substrate. The superconducting thin film is employed as a zero-resistivity electrode material for a surface acoustic wave resonator with internal quality factors Q ≈ 17 000 representing a three-fold enhancement compared to identical devices with normal conducting electrodes. Superconducting operation of ≈ 400 M H z resonators is achieved to temperatures T > 7 K and electrical radio frequency powers P r f > + 9 d B m . Heterogeneously integrated single QDs couple to the resonant phononic field of the surface acoustic wave resonator operated in the superconducting regime. Position and frequency selective coupling mediated by deformation potential co...
Cornell University - arXiv, Nov 28, 2022
Surface acoustic waves (SAWs) are a versatile tool for coherently interfacing with a variety of s... more Surface acoustic waves (SAWs) are a versatile tool for coherently interfacing with a variety of solid-state quantum systems spanning microwave to optical frequencies, including superconducting qubits, spins, and quantum emitters. Here, we demonstrate SAW cavity optomechanics with quantum emitters in 2D materials, specifically monolayer WSe2, on a planar lithium niobate SAW resonator driven by superconducting electronics. Using steady-state photoluminescence spectroscopy and time-resolved single-photon counting, we map the temporal dynamics of modulated 2D emitters under coupling to different SAW cavity modes, showing energy-level splitting consistent with deformation potential coupling of 30 meV/%. We leverage the large anisotropic strain from the SAW to modulate the excitonic fine-structure splitting on a nanosecond timescale, which may find applications for on-demand entangled photon-pair generation from 2D materials. Cavity optomechanics with SAWs and 2D quantum emitters provides opportunities for compact sensors and quantum electro-optomechanics in a multi-functional integrated platform that combines phononic, optical, and superconducting electronic quantum systems.
IEEE Transactions on Quantum Engineering
Surface acoustic waves (SAWs) are a versatile tool for realizing coherent quantum interfaces betw... more Surface acoustic waves (SAWs) are a versatile tool for realizing coherent quantum interfaces between various solid-state qubits spanning microwave to optical frequencies. Through strain, electric, or magnetic fields associated with acoustic waves, qubit states can be controlled and measured with exquisite precision for applications in quantum information processing, memory, transduction, and sensing. In this review, we discuss progress toward quantum control using surface acoustic waves coupled to optically active artificial atoms, including semiconductor quantum dots (QDs), optically addressable solid-state spins, and quantum emitters in van der Waals materials. We outline the device, material, and theoretical considerations for realizing interactions with surface acoustic waves in the quantum regime, summarize the state of the art in coupling surface acoustic waves to artificial atoms, and provide insight into the current trends and trajectory of the field. INDEX TERMS Quantum dots (QDs), quantum networking and communications, surface acoustic waves (SAWs).
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Papers by Michael Choquer