Superconducting circuit quantum computing with nanomechanical resonators as storage
Superconducting circuit quantum computing with nanomechanical resonators as storage
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DOI：
10.1088/2058-9565/aadc6c
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发表时间：
2018-08
影响因子：
6.7
通讯作者：
M. Pechal;Patricio Arrangoiz-Arriola;A. Safavi-Naeini
中科院分区：
文献类型：
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作者：
M. Pechal;Patricio Arrangoiz-Arriola;A. Safavi-Naeini
我们分析了用于调节存储在声子晶体腔谐振器集合中的量子信息之间的相互作用的超导跨蒙电路的量子信息处理能力。由于只有一个外部控制的处理元件，使得这种方法比单独控制每个量子比特的传统体系结构的硬件密集度要低得多。此外，与通常认为的使用共面波导或3D腔微波谐振器进行存储的替代方法相比，纳米机械谐振器提供了非常长的寿命和很小的尺寸-这是对微波谐振器的两个相互冲突的要求。通过详细的选通误差分析，得出了作为系统中机械谐振器数量的函数的量子比特-谐振器耦合率的最佳值。对于一组给定的系统参数，可以找到特定的耦合量和谐振器的数量来优化量子体积，量子体积是系统计算能力的近似衡量标准。我们看到，在提出的混合纳米机械体系结构中，这一体积比竞争的芯片上电磁方法中的体积更高。
We analyze the quantum information processing capability of a superconducting transmon circuit used to mediate interactions between quantum information stored in a collection of phononic crystal cavity resonators. Having only a single processing element to be controlled externally makes this approach significantly less hardware-intensive than traditional architectures with individual control of each qubit. Moreover, when compared with the commonly considered alternative approach using coplanar waveguide or 3d cavity microwave resonators for storage, the nanomechanical resonators offer both very long lifetime and small size—two conflicting requirements for microwave resonators. A detailed gate error analysis leads to an optimal value for the qubit-resonator coupling rate as a function of the number of mechanical resonators in the system. For a given set of system parameters, a specific amount of coupling and number of resonators is found to optimize the quantum volume, an approximate measure for the computational capacity of a system. We see this volume is higher in the proposed hybrid nanomechanical architecture than in the competing on-chip electromagnetic approach.