Scalable Fault-Tolerant Quantum Computation in Decoherence-Free Subspaces
Zheng-Wei Zhou, Bo Yu, Xingxiang Zhou *, Marc J. Feldman *, and Guang-Can
Guo
Key Laboratory of Quantum Information, University of Science and Technology of China,
Chinese Academy of Sciences, Hefei, Anhui, China, 230026
* Superconducting Digital Electronics Lab, Electrical and Computer
Engineering Department
University of Rochester, Rochester, NY 14627, USA
Abstract -
We investigate how to concatenate different decoherence-free subspaces to
realize scalable universal fault-tolerant quantum computation. Based on
tunable XXZ interactions, we present an architecture for scalable quantum
computers which can fault-tolerantly perform universal quantum computation
by manipulating only a single type of parameter. By using the concept of
interaction-free subspaces, we eliminate the need to tune the couplings
between logical qubits, which further reduces the technical difficulties
for implementing quantum computation.
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