6 papers
Classification and purification for the independent quantum channel through quantum error-correction
Long Huang, Xiaohua Wu, Tao Zhou
The essence of quantum error-correction is to use redundant Hilbert space to identify and correct errors, and the channel fidelity of the quantum channel does not affect which erro…
Averaged fidelity-based steering criteria
Xiaohua Wu, Bo You, Tao Zhou
In the present work, the averaged fidelity is introduced as the steering parameter. According to the definitions of steering from Alice to Bob, a general scheme for designing linea…
Diagnosing steerability of a bipartite state with the nonsteering threshold
Xiaohua Wu, Tao Zhou
In the present work, a traditional quantity, the averaged fidelity, is introduced as the steering parameter. From the definitions of steering from Alice to Bob and the joint measur…
Robustness of the concatenated quantum error-correction protocol against noise for channels affected by fluctuation
Long Huang, Xiaohua Wu, Tao Zhou
In quantum error correction, the description of noise channel cannot be completely accurate, and fluctuation always appears in noise channel. It is found that when fluctuation of p…
Certifying quantumness with the classical fidelity threshold
Long Huang, Xiaohua Wu, Tao Zhou
For a given ensemble of input and target states, the classical fidelity threshold (CFT) is the maximum valve of the averaged fidelity, and it can be achieved with a measure-and-pre…
Performance of five-qubit code for arbitrary error channels
Long Huang, Xiaohua Wu, Tao Zhou
In quantum error correction, it is an important assumption that errors on different qubits are independent. In our previous work [Phys. Rev. A {\bf 92}, 052320 (2015)], the general…