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arXiv · 1711.01932

Coherent spin-qubit photon coupling

A. J. Landig·J. V. Koski·P. Scarlino·U. C. Mendes·A. Blais·C. Reichl·W. Wegscheider·A. Wallraff·K. Ensslin·T. Ihn
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Abstract

Electron spins hold great promise for quantum computation due to their long coherence times. An approach to realize interactions between distant spin-qubits is to use photons as carriers of quantum information. We demonstrate strong coupling between single microwave photons in a NbTiN high impedance cavity and a three-electron spin-qubit in a GaAs triple quantum dot. We resolve the vacuum Rabi mode splitting with a coupling strength of $g/2π\simeq31$ MHz and a qubit decoherence of $γ_2/2π\simeq 20$ MHz. We can tune the decoherence electrostatically and obtain a minimal $γ_2/2π\simeq 10$ MHz for $g/2π\simeq 23$ MHz. The dependence of the qubit-photon coupling strength on the tunable electric dipole moment of the qubit is measured directly using the ac Stark effect. Our demonstration of strong spin-photon interaction is an important step towards coherent long-distance coupling of spin-qubits.

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A. J. Landig, J. V. Koski, P. Scarlino, U. C. Mendes, A. Blais, C. Reichl, W. Wegscheider, A. Wallraff, K. Ensslin, T. Ihn. 2017-11-06. Coherent spin-qubit photon coupling. https://doi.org/10.1038/s41586-018-0365-y

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