Distinguishing unitary gates on the IBM quantum processor
Science China Information Sciences , Volume 62 p. 72502
An unknown unitary gate, which is secretly chosen from several known ones, can always be distinguished perfectly. In this paper, we implement such a task on IBM’s quantum processor. More precisely, we experimentally demonstrate the discrimination of two qubit unitary gates, the identity gate and the π-phase shift gate, using two discrimination schemes — the parallel scheme and the sequential scheme. We program these two schemes on the ibmqx4, a 5-qubit superconducting quantum processor via IBM cloud, with the help of the QSI modules. We report that both discrimination schemes achieve success probabilities at least 85%.
|Keywords||IBM quantum computer, Parallel schemes for unitary discrimination, Quantum experiment, Sequential schemes for unitary discrimination, Software-aided quantum experiment|
|Journal||Science China Information Sciences|
Liu, S, Li, Y, & Duan, R. (2019). Distinguishing unitary gates on the IBM quantum processor. Science China Information Sciences, 62. doi:10.1007/s11432-018-9703-y