Coherent spin-qubit photon coupling: Part 1

Coherently coupling a spin-qubit to a single microwave photon is one of the main challenges to overcome towards the development of quantum information processors based on spin-qubits. The coherent coupling of photons to spin is, however, weak and alternative strategies involving charge can be used. One such strategy is to rely on the exchange interaction, which naturally couples spin to orbital degrees of freedom. In this talk, we investigate theoretically and experimentally a spin-qubit, formed by three electrons confined in a triple quantum dot, coupled to a superconducting resonator [1]. We first show the spin nature of the qubit and its coupling to photons in the resonator. Second, we characterize the spin-qubit decoherence by analyzing the effects of charge noise due to voltage fluctuations. Finally, we show how the spin-qubit can be coupled longitudinally to the microwave resonator.

[1] A. J. Landig et al., in preparation.