Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator

Abstract

The strong coupling limit of cavity quantum electrodynamics (QED) implies the capability of a matter-like quantum system to coherently transform an individual excitation into a single photon within a resonant structure. This not only enables essential processes required for quantum information processing but also allows for fundamental studies of matter-light interaction. In this work we demonstrate strong coupling between the charge degree of freedom in a gate-detuned GaAs double quantum dot (DQD) and a frequency-tunable high impedance resonator realized using an array of superconducting quantum interference devices (SQUIDs). In the resonant regime, we resolve the vacuum Rabi mode splitting of size $2g/2\pi =238$ MHz at a resonator linewidth $\kappa /2\pi =12$ MHz and a DQD charge qubit dephasing rate of ${\gamma }_2/2\pi =80$ MHz extracted independently from microwave spectroscopy in the dispersive regime. Our measurements indicate a viable path towards using circuit based cavity QED for quantum information processing in semiconductor nano-structures.

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Cited by in corpus (8)

• Input-output theory for spin-photon coupling in Si double quantum dots
• On-demand microwave generator of shaped single photons
• Ultra-Strong Light-Matter Coupling in Deeply Subwavelength THz LC resonators
• Quantum interface between photonic and superconducting qubits
• Measurements of a Quantum Dot with an Impedance-Matching On-Chip LC Resonator at GHz Frequencies
• Phase locking of a semiconductor double quantum dot single atom maser
• Charge-photon transport statistics and short-time correlations in a single quantum dot-resonator system with arbitrarily large coupling parameter
• Conditioned spin and charge dynamics of a single electron quantum dot