Dispersive manipulation of paired superconducting qubits
Xingxiang Zhou,1,2 Michael Wulf,2 Zhengwei Zhou,3 Guangcan Guo,3 and Marc
J. Feldman
1 Department of Electrical and Computer Engineering, University of
Rochester, Rochester, New York 14627, USA
2 Department of Physics and Astronomy, University of Rochester, Rochester,
New York 14627, USA
3 Key Laboratory of Quantum Information, University of Science and
Technology of China,
Chinese Academy of Sciences, Hefei, Anhui, China, 230026
Abstract -
We combine the ideas of qubit encoding and dispersive dynamics to enable
robust and easy quantum-information processing on paired superconducting
charge boxes sharing a common bias lead. We establish a decoherence free
subspace on these and introduce universal gates by dispersive interaction
with a LC resonator and inductive couplings between the encoded qubits.
These gates preserve the code space and only require the established local
symmetry and the control of the voltage bias. The principle of dispersive
manipulation of encoded qubits is general and beneficial to other physical
systems.
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