Multi-qubit non-adiabatic holonomic controlled quantum gates in decoherence-free subspaces

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• 作者：Shi Hu ; Wen-Xue Cui ; Qi Guo ; Hong-Fu Wang ; Ai-Dong Zhu…
• 刊名：Quantum Information Processing
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：15
• 期：9
• 页码：3651-3661
• 全文大小：399 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Mathematics
  Engineering, general
  Computer Science, general
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1573-1332
• 卷排序：15

文摘

Non-adiabatic holonomic quantum gate in decoherence-free subspaces is of greatly practical importance due to its built-in fault tolerance, coherence stabilization virtues, and short run-time. Here, we propose some compact schemes to implement two- and three-qubit controlled unitary quantum gates and Fredkin gate. For the controlled unitary quantum gates, the unitary operator acting on the target qubit is an arbitrary single-qubit gate operation. The controlled quantum gates can be directly implemented by utilizing non-adiabatic holonomy in decoherence-free subspaces and the required resource for the decoherence-free subspace encoding is minimal by using only two neighboring physical qubits undergoing collective dephasing to encode a logical qubit.KeywordsMulti-qubit controlled gateQuantum holonomyDecoherence-free subspace