Constructing A Protected Qubit Subspace

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In this project we presented a new general scheme for the construction of a protected qubit subspace. The scheme, which is suitable for levels with either half-integer or integer angular momentum states, utilizes a multi-state structure, on which continuous dynamical decoupling fields are applied. The scheme can be realized with state-of-the-art experimental setups, and should be able to push the coherence time to the lifetime limit. Moreover, it is suitable for a wide range of solid-state and atomic systems, and it is applicable to a variety of tasks in the field of quantum information such as quantum sensing, quantum magnetometery, and quantum memories. We analyzed the performance of the scheme for the case composed of trapped ions, and showed how single qubit gates and an ensemble coupling to a cavity mode can be implemented efficiently. In future work we will investigate the implementation of the scheme and its performance with other solid state and atomic systems.
Published work was done in collaboration with Prof. Michael Drewsen.