Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large Josephson junction
Fast entanglement of two charge-phase qubits through nonadiabatic coupling to a large Josephson junction
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DOI：
10.1103/physrevb.70.224515
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发表时间：
2003-07
影响因子：
3.7
通讯作者：
Ying-Dan Wang;Peng Zhang;D. Zhou;Chang-pu Sun
中科院分区：
文献类型：
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作者：
Ying-Dan Wang;Peng Zhang;D. Zhou;Chang-pu Sun
我们提出了一个理论协议的量子逻辑门之间的两个约瑟夫森结电荷相位量子比特通过控制它们的耦合到一个大的结，其约瑟夫森耦合能量是远远大于其库仑电荷能量。在大结的低激发极限下，它有效地表现为谐振子的量子数据总线模式。我们的协议可以是快速的，因为它不需要数据总线保持在其基态，因此它可以在一个广泛的参数制度独立的数据总线量子态。
We propose a theoretical protocol for quantum logic gates between two Josephson junction charge-phase qubits through the control of their coupling to a large junction whose Josephson coupling energy is much larger than its Coulomb charge energy. In the low excitation limit of the large junction, it behaves effectively as a quantum data-bus mode of a harmonic oscillator. Our protocol can be fast since it does not require the data-bus to stay adiabatically in its ground state, as such it can be implemented over a wide parameter regime independent of the data-bus quantum state.