Protection of Logical Qubits via Optimal State Transfers
Jiang Zhang, Zheng-Yang Zhou, Lian-Ao Wu, J. Q. You · Physical Review Applied · 2019
In quantum computing, symmetry plays a central role in protecting qubits from errors. This work develops an efficient approach to creating decoherence-free subspaces for logical qubits, by optimally transferring the states of physical qubits via concatenated dynamical decoupling. This method bears a distinct superiority for many-qubit systems, owing to its polynomial speedup over previous approaches, which makes it promising for generating a higher-dimensional decoherence-free subspace to encode more protected logical qubits for fault-tolerant quantum computation.