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arXiv 1304.4615quant-phcond-mat.quant-gas
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具有环形光晶格的超流量子比特系统

Superfluid qubit systems with ring shaped optical lattices

Luigi Amico, Davit Aghamalyan, H. Crepaz, F. Auksztol, R. Dumke, L. -C. Kwek

摘要:

我们研究了一个实验上可行的量子比特系统采用中性原子电流。我们的系统是基于囚禁在环形光晶格势中的玻色冷原子。格使系统严格一维,它提供了基础设施,实现可调的环-环相互作用。我们的实现结合了中性冷原子系统的低退相干率,克服了单点寻址,具有拓扑保护的固态约瑟夫森通量量子比特的鲁棒性。采用中性原子作为磁通载流子,可以使影响约瑟夫森结基磁通量子比特的磁场特征涨落最小化。通过打破伽利略不变性,我们展示了如何通过晶格原子电流提供一个量子比特的实现。这可以通过在单个环中人为地产生相位滑移,或者通过两个均匀环晶格的隧道耦合来实现。实验研究了单量子位基础设施与定制的光学势。事实上,我们已经在实验上实现了缩放的环晶格势,原则上,它可以容纳这样的环量子位的$n\sim 10$,沿着激光束传播轴以堆叠配置排列。讨论了一种实验上可行的双环量子比特方案。基于我们的分析,我们提供了初始化,寻址和读出量子位的协议。

英文摘要:

We study an experimentally feasible qubit system employing neutral atomic currents. Our system is based on bosonic cold atoms trapped in ring-shaped optical lattice potentials. The lattice makes the system strictly one dimensional and it provides the infrastructure to realize a tunable ring-ring interaction. Our implementation combines the low decoherence rates of of neutral cold atoms systems, overcoming single site addressing, with the robustness of topologically protected solid state Josephson flux qubits. Characteristic fluctuations in the magnetic fields affecting Josephson junction based flux qubits are expected to be minimized employing neutral atoms as flux carriers. By breaking the Galilean invariance we demonstrate how atomic currents through the lattice provide a implementation of a qubit. This is realized either by artificially creating a phase slip in a single ring, or by tunnel coupling of two homogeneous ring lattices. The single qubit infrastructure is experimentally investigated with tailored optical potentials. Indeed, we have experimentally realized scaled ring-lattice potentials that could host, in principle, $n\sim 10$ of such ring-qubits, arranged in a stack configuration, along the laser beam propagation axis. An experimentally viable scheme of the two-ring-qubit is discussed, as well. Based on our analysis, we provide protocols to initialize, address, and read-out the qubit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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