Brown T, Doucet E, Ristè D, Ribeill G, Cicak K, Aumentado J, Simmonds R, Govia L, Kamal A, Ranzani L
Department of Physics and Applied Physics, University of Massachusetts, Lowell, MA, 01854, USA.
Quantum Engineering and Computing, Raytheon BBN, Cambridge, MA, 02138, USA.
Nat Commun. 2022 Jul 9;13(1):3994. doi: 10.1038/s41467-022-31638-0.
Quantum reservoir engineering is a powerful framework for autonomous quantum state preparation and error correction. However, traditional approaches to reservoir engineering are hindered by unavoidable coherent leakage out of the target state, which imposes an inherent trade off between achievable steady-state state fidelity and stabilization rate. In this work we demonstrate a protocol that achieves trade off-free Bell state stabilization in a qutrit-qubit system realized on a circuit-QED platform. We accomplish this by creating a purely dissipative channel for population transfer into the target state, mediated by strong parametric interactions coupling the second-excited state of a superconducting transmon and the engineered bath resonator. Our scheme achieves a state preparation fidelity of 84% with a stabilization time constant of 339 ns, leading to a 54 ns error-time product in a solid-state quantum information platform.
量子库工程是一种用于自主量子态制备和纠错的强大框架。然而，传统的库工程方法受到目标态不可避免的相干泄漏的阻碍，这在可实现的稳态保真度和稳定率之间造成了固有的权衡。在这项工作中，我们展示了一种协议，该协议在基于电路量子电动力学平台实现的三量子比特 - 量子比特系统中实现了无权衡的贝尔态稳定。我们通过创建一个纯耗散通道来实现这一点，该通道用于将粒子数转移到目标态，由耦合超导传输子的第二激发态和工程化的浴谐振器的强参数相互作用介导。我们的方案在固态量子信息平台上实现了84%的态制备保真度，稳定时间常数为339纳秒，导致误差 - 时间积为54纳秒。
