Temporal Quantum Correlations in Superconducting-Qubit Systems
Published in Bulletin of the American Physical Society, 2021
Nonlocality has long been studied through quantum correlations between spatially separated measurements on the bipartite systems. Its temporal analogue, in which measurements on a quantum state are separated in time, examines the quantum correlations violating the macrorealism, for example the Leggett-Garg inequality. In this work, we investigate the temporal quantum correlations of a superconducting qubit undergoing stochastic noise through the studies of the nonmacrorealism, temporal steering, and temporal inseparability. Decoherence of different forms can be observed with the quantum correlations, and unique sudden-death and revival of temporal correlations under non-Markovianity can also be identified and quantified. Our work shows that the temporal quantum correlations can provide a benchmark for the decoherence in superconducting quantum devices.
Recommended citation: Hao-Cheng Weng, Chen-Yeh Wei, Huan-Yu Ku, Shin-Liang Chen, Yueh-Nan Chen, Chih-Sung Chuu, Temporal Quantum Correlations in Superconducting-Qubit Systems. Bulletin of the American Physical Society 66 (2021).
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