Coherent Control of an Optical Quantum Dot Using Phonons and Photons
arxiv(2024)
摘要
Genuine quantum-mechanical effects are readily observable in modern
optomechanical systems comprising bosonic ("classical") optical resonators.
Here we describe unique features and advantages of optical two-level systems,
or qubits, for optomechanics. The qubit state can be coherently controlled
using both phonons and resonant or detuned photons. We experimentally
demonstrate this using charge-controlled InAs quantum dots (QDs) in
surface-acoustic-wave resonators. Time-correlated single-photon counting
measurements reveal the control of QD population dynamics using engineered
optical pulses and mechanical motion. As a first example, at moderate acoustic
drive strengths, we demonstrate the potential of this technique to maximize
fidelity in quantum microwave-to-optical transduction. Specifically, we tailor
the scheme so that mechanically assisted photon scattering is enhanced over the
direct detuned photon scattering from the QD. Spectral analysis reveals
distinct scattering channels related to Rayleigh scattering and luminescence in
our pulsed excitation measurements which lead to time-dependent scattering
spectra. Quantum-mechanical calculations show good agreement with our
experimental results, together providing a comprehensive description of
excitation, scattering and emission in a coupled QD-phonon optomechanical
system.
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