论文标题
可切换的下一个最新邻居耦合，用于受控的两Q Q Q量
Switchable next-nearest-neighbor coupling for controlled two-qubit operations
论文作者
论文摘要
在与最近邻居耦合的超导量子处理器中，相邻Qubits之间的分散相互作用可能会导致有效的下一个最新邻居偶联，其强度取决于中间值的状态。在这里，我们从理论上探讨了工程下一个最新的邻居耦合以实施控制的两量Qubit操作的可能性，其中中介量子器控制着下一个最新的邻居对Qubits的操作。 In particular, in a system comprising two types of superconducting qubits with anharmonicities of opposite-sign arranged in an -A-B-A- pattern, where the unwanted static ZZ coupling between adjacent qubits could be heavily suppressed, a switchable coupling between the next-nearest-neighbor qubits can be achieved via the intermediary qubit, the qubit state of which functions as an on/off switch for this耦合。因此，根据所采用的激活方案，可以实现各种受控的两数量操作（例如受控的ISWAP门），可能会导致电路深度减少用于实现通用量子算法的标准分解方法。
In a superconducting quantum processor with nearest neighbor coupling, the dispersive interaction between adjacent qubits can result in an effective next-nearest-neighbor coupling whose strength depends on the state of the intermediary qubit. Here, we theoretically explore the possibility of engineering this next-nearest-neighbor coupling to implement controlled two-qubit operations where the intermediary qubit controls the operation on the next-nearest neighbor pair of qubits. In particular, in a system comprising two types of superconducting qubits with anharmonicities of opposite-sign arranged in an -A-B-A- pattern, where the unwanted static ZZ coupling between adjacent qubits could be heavily suppressed, a switchable coupling between the next-nearest-neighbor qubits can be achieved via the intermediary qubit, the qubit state of which functions as an on/off switch for this coupling. Therefore, depending on the adopted activating scheme, various controlled two-qubit operations such as controlled-iSWAP gate can be realized, potentially enabling circuit depth reductions as to a standard decomposition approach for implementing generic quantum algorithms.
