Microwave detection of electron-phonon interactions in a cavity-coupled double quantum dot

Abstract

Quantum confinement leads to the formation of discrete electronic states in quantum dots. Here we probe electron-phonon interactions in a suspended InAs nanowire double quantum dot (DQD) that is electric-dipole coupled to a microwave cavity. We apply a finite bias across the wire to drive a steady state population in the DQD excited state, enabling a direct measurement of the electron-phonon coupling strength at the DQD transition energy. The amplitude and phase response of the cavity field exhibit features that are periodic in the DQD energy level detuning due to the phonon modes of the nanowire. The observed cavity phase shift is consistent with theory that predicts a renormalization of the cavity center frequency by coupling to phonons.

References in corpus (10)

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• Circuit Quantum Electrodynamics with a Spin Qubit
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Experimental signature of phonon-mediated spin relaxation
• Cooling carbon nanotubes to the phononic ground state with constant electron current
• Phonon-Assisted Gain in a Semiconductor Double Quantum Dot Maser
• Dephasing-assisted Gain and Loss in Mesoscopic Quantum Systems
• Keldysh meets Lindblad: Correlated Gain and Loss in Higher-Order Perturbation Theory
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• Zero-Phonon Line Broadening and Satellite Peaks in Nanowire Quantum Dots: The Role of Piezoelectric Coupling

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• Nuclear spin readout in a cavity-coupled hybrid quantum dot-donor system
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