论文标题
具有多光谱变性的两光子驱动的Kerr量子振荡器
Two-photon driven Kerr quantum oscillator with multiple spectral degeneracies
论文作者
论文摘要
由两光子过程驱动的KERR非线性振荡器是有望编码量子信息并确保硬件有效的缩放对故障耐受量的量子计算的有前途的系统。在本文中，我们表明，额外的控制参数，即相对于振荡器共振的两光子驱动器的失沟，在定义量子的性质中起着至关重要的作用。在这种令人失望的特定值下，我们受益于系统中的强对称性，从而导致有效限制性汉密尔顿的频谱中的多个脱落性。总体而言，这些变性导致对位叶片误差的抑制更强。我们还研究了这种哈密顿量与彩色耗散的结合，以抑制骨码空间之外的泄漏。我们表明，额外的变性使我们能够执行快速，高保真的门，同时保留对位翼误差的强烈抑制。
Kerr nonlinear oscillators driven by a two-photon process are promising systems to encode quantum information and to ensure a hardware-efficient scaling towards fault-tolerant quantum computation. In this paper, we show that an extra control parameter, the detuning of the two-photon drive with respect to the oscillator resonance, plays a crucial role in the properties of the defined qubit. At specific values of this detuning, we benefit from strong symmetries in the system, leading to multiple degeneracies in the spectrum of the effective confinement Hamiltonian. Overall, these degeneracies lead to a stronger suppression of bit-flip errors. We also study the combination of such Hamiltonian confinement with colored dissipation to suppress leakage outside of the bosonic code space. We show that the additional degeneracies allow us to perform fast and high-fidelity gates while preserving a strong suppression of bit-flip errors.
