Abstract
Quantum technologies that rely on photonic qubits require a precise controllability of their properties. For this purpose hybrid approaches are particularly attractive because they offer a large flexibility to address different aspects of the photonic degrees of freedom. When combining photonics with other quantum platforms like phonons, quantum transducers have to be realized that convert between the mechanical and optical domain. Here, we realize this interface between phonons in the form of surface acoustic waves (SAWs) and single photons, mediated by a single semiconductor quantum dot exciton. In this combined theoretical and experimental study, we show that the different sidebands exhibit characteristic blinking dynamics that can be controlled by detuning the laser from the exciton transition. By developing analytical approximations we gain a better understanding of the involved internal dynamics. Our specific SAW approach allows us to reach the ideal frequency range of around 1 GHz that enables simultaneous temporal and spectral phonon sideband resolution close to the combined fundamental time-bandwidth limit.
Highlights
Quantum emitters are arguably one of the most important elements in photonic quantum technologies [1,2]
Interdigital transducers (IDTs) with a Split-5-2 configuration were fabricated on the sample surface with electron beam lithography in a lift-off process to enable frequency-tunable excitation of surface acoustic wave (SAW) that are interfaced with the quantum dot (QD) [17,18]
The QD exciton transition is excited by a narrow band continuous wave laser driven in the limit of low Rabi frequencies reaching the regime of single photon operation
Summary
Quantum emitters are arguably one of the most important elements in photonic quantum technologies [1,2]. A promising approach in quantum applications is based on time-bin encoding [3,4], which requires a precise control over the spectral and temporal degrees of freedom of single photons Such reconfiguration of quantum emitters is demanding because it requires a high level of control of their spectral properties [5,6] and advanced experimental techniques. This promises deeper understanding of switching dynamics with a combined access to both, spectral and temporal properties By reaching this ideal control on the single photon level will allow to operate single solid state qubits as fully-fledged optomechanical quantum transducers. By advancing our resolved PSB spectroscopy on single SAW-modulated QDs to a fully-fledged time-domain detection scheme and introducing parametric detuned optical excitation we are able to demonstrate controlled photon scattering with time and frequency resolution very close to the fundamental time-bandwidth limit
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