Exploring ququart computation on a transmon using optimal control
Exploring ququart computation on a transmon using optimal control
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DOI：
10.1103/physreva.108.062609
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发表时间：
2023-04
影响因子：
2.9
通讯作者：
Lennart Maximilian Seifert;Ziqian Li;Tanay Roy;D. Schuster;F. Chong;Jonathan M. Baker
中科院分区：
文献类型：
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作者：
Lennart Maximilian Seifert;Ziqian Li;Tanay Roy;D. Schuster;F. Chong;Jonathan M. Baker
当代量子计算机以二进制量子比特（d = 2）编码和处理量子信息。然而，许多架构包括较高的能量水平，这些能量水平被留下作为未使用的计算资源。我们展示了一个超导量子（d = 4）处理器和联合收割机量子最优控制与有效的门分解实现高保真量子门。我们区分视量子比特作为一个广义的四级量子比特和一个编码的量子比特对，并在每种情况下，所产生的门的特征。在随机基准测试实验中，我们观察到门的一致性大于95%，并确定一致性的主要限制因素。我们的研究结果验证quququarts作为一个可行的工具，量子信息处理。
Contemporary quantum computers encode and process quantum information in binary qubits (d = 2). However, many architectures include higher energy levels that are left as unused computational resources. We demonstrate a superconducting ququart (d = 4) processor and combine quantum optimal control with efficient gate decompositions to implement high-fidelity ququart gates. We distinguish between viewing the ququart as a generalized four-level qubit and an encoded pair of qubits, and characterize the resulting gates in each case. In randomized benchmarking experiments we observe gate fidelities greater 95% and identify coherence as the primary limiting factor. Our results validate ququarts as a viable tool for quantum information processing.