Single shot i-Toffoli gate in dispersively coupled superconducting qubits
Single shot i-Toffoli gate in dispersively coupled superconducting qubits
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DOI：
10.1063/5.0077443
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发表时间：
2022-01-31
影响因子：
4
通讯作者：
Hartmann, Michael J.
中科院分区：
文献类型：
--
作者：
Baker, Aneirin J.;Huber, Gerhard B. P.;Hartmann, Michael J.
量子算法通常受益于执行多量子比特(>；2)门的能力。到目前为止，这种多量子比特门通常被分解为单量子比特门和双量子比特门，特别是在超导量子比特体系结构中。在一个步骤中执行多个量子比特操作的能力可以极大地提高许多算法的保真度和执行时间。在这里，我们提出了一种利用现有超导硬件实现I-Toffoli门的单次激发方法，即具有两个控制和一个目标量子比特的三量子比特门。我们给出了超导量子比特通过可调谐耦合器相互作用的数值证据，其过程保真度超过99.5%，选通时间为450 ns。我们的方法可以直接向前扩展到实现具有两个以上类似保真度的控制量子比特的门。
Quantum algorithms often benefit from the ability to execute multi-qubit (> 2) gates. To date, such multi-qubit gates are typically decomposed into single- and two-qubit gates, particularly in superconducting qubit architectures. The ability to perform multi-qubit operations in a single step could vastly improve the fidelity and execution time of many algorithms. Here, we propose a single shot method for executing an i-Toffoli gate, a three-qubit gate with two control and one target qubit, using currently existing superconducting hardware. We show numerical evidence for a process fidelity over 99.5% and a gate time of 450 ns for superconducting qubits interacting via tunable couplers. Our method can straight forwardly be extended to implement gates with more than two control qubits at similar fidelities.