论文标题
四光子KERR参数振荡器中的自主量子误差校正器
Autonomous Quantum Error Correction in a Four-Photon Kerr Parametric Oscillator
论文作者
论文摘要
自主量子误差校正已引起了很大的关注，以避免复杂的测量和反馈。尽管与常规测量的量子误差校正相比，它的简单性，但由于大量的硬件开销，它仍然远非实用技术。我们为四光子KERR参数振荡器中的旋转对称性骨质代码提出了一种自主量子误差校正方案。我们的方案是可以超过收获点的最简单的误差校正方案 - 仅需要一个连续的微波音。我们还引入了一种无条件的复位方案，该方案除了纠正误差之外还需要一个连续的微波音调。这种简单性的关键特性是四光子kerr参数振荡器和其否定水平结构中的退化的受保护的准烯类态。这些属性消除了在FOCK基础上进行逐个状态校正的需求。我们的方案大大降低了自主量子误差校正的复杂性，因此可能会加速使用Bosonic代码进行实用量子计算。
Autonomous quantum error correction has gained considerable attention to avoid complicated measurements and feedback. Despite its simplicity compared with the conventional measurement-based quantum error correction, it is still a far from practical technique because of significant hardware overhead. We propose an autonomous quantum error correction scheme for a rotational symmetric bosonic code in a four-photon Kerr parametric oscillator. Our scheme is the simplest possible error correction scheme that can surpass the break-even point -- it requires only a single continuous microwave tone. We also introduce an unconditional reset scheme that requires one more continuous microwave tone in addition to that for the error correction. The key properties underlying this simplicity are protected quasienergy states of a four-photon Kerr parametric oscillator and the degeneracy in its quasienergy level structure. These properties eliminate the need for state-by-state correction in the Fock basis. Our schemes greatly reduce the complexity of autonomous quantum error correction and thus may accelerate the use of the bosonic code for practical quantum computation.
