Protecting a Spin Ensemble against Decoherence in the Strong-Coupling Regime of Cavity QED

Abstract

Hybrid quantum systems based on spin ensembles coupled to superconducting microwave cavities are promising candidates for robust experiments in cavity quantum electrodynamics (QED) and for future technologies employing quantum mechanical effects. Currently the main source of decoherence in these systems is inho- mogeneous spin broadening, which limits their performance for the coherent transfer and storage of quantum information. Here we study the dynamics of a superconducting cavity strongly coupled to an ensemble of nitrogen-vacancy centers in diamond. We experimentally observe for the first time, how decoherence induced by a non-Lorentzian spin distribution can be suppressed in the strong-coupling regime - a phenomenon known as "cavity protection". To demonstrate the potential of this effect for coherent control schemes, we show how appropriately chosen microwave pulses can increase the amplitude of coherent oscillations between cavity and spin ensemble by two orders of magnitude.

16 pages, 4 figures

References in corpus (7)

• Coupling Superconducting Qubits via a Cavity Bus
• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond
• Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity
• Anisotropic rare-earth spin ensemble strongly coupled to a superconducting resonator
• Spectroscopic properties of inhomogeneously broadened spin ensembles in a cavity
• Fast, low-power manipulation of spin ensembles in superconducting microresonators

Cited by in corpus (7)

• Quantum technologies with hybrid systems
• Exchange Magnon-Polaritons in Microwave Cavities
• Magnetic spheres in microwave cavities
• Interfacing microwave qubits and optical photons via spin ensembles
• Non-Markovian dynamics of a single-mode cavity strongly coupled to an inhomogeneously broadened spin ensemble
• Improving the lifetime of the NV center ensemble coupled with a superconducting flux qubit by applying magnetic fields
• Hybrid Quantum Systems with Collectively Coupled Spin States: Suppression of Decoherence through Spectral Hole Burning