We investigate how quantum measurements affect the dynamics of quantum correlations of the system which consists of two noninteracting superconducting qubits each locally coupling to its own data bus. It is shown that the geometric discord and entanglement between two superconducting qubits can be increased by applying a sequence of selective measurements. The optimal measurement time at which the quantum correlations achieve their maximal values is also analyzed. Moreover, we find that the selective measurements on the data buses can protect quantum information of two superconducting qubits and force information to flow back to the superconducting qubits from the data buses by a witness of the trace distance.
© 2013 Optical Society of America
Original Manuscript: March 19, 2013
Revised Manuscript: June 5, 2013
Manuscript Accepted: July 10, 2013
Published: July 26, 2013
Dong-Mei Wang, Hang-Shi Xu, Jing-Bo Xu, and You-Hong Yu, "Enhancement of geometric discord for the system of superconducting qubits and transfer of quantum information," J. Opt. Soc. Am. B 30, 2277-2285 (2013)