利用介观光学参量相互作用实现三次量子非破坏哈密顿量
Engineering cubic quantum nondemolition Hamiltonian with mesoscopic optical parametric interactions
AI总结：
该研究提出一种利用介观光学参量相互作用实现三次量子非破坏哈密顿量的方案，可高效制备非高斯量子态，并具有高探测效率容忍度，有望在近期实验中实现。
摘要：
我们提出了一种利用光学参量相互作用实现三次量子非破坏（QND）哈密顿量的方案。我们证明，在χ^(2)非线性介质中传播的强压缩基频场和二次谐波场有效演化于三次QND哈密顿量下。我们强调了该哈密顿量在工程化非高斯量子态（如薛定谔猫态和三次相位态）方面的多功能性。我们证明，借助辅助高增益相位敏感光学放大器，我们的方案对整体探测效率低下具有高度容忍性。我们的方案涉及介观光子数区域中的参量相互作用，显著增强了有效非线性耦合，超越了朴素单光子耦合率，同时提供了对抗光子传播损耗的有力手段。实验数据表明，我们的方案在不久的将来可能是可行的，尤其是在脉冲非线性纳米光子学领域。
英文摘要：
We propose a scheme to realize cubic quantum nondemolition (QND) Hamiltonian with optical parametric interactions. We show that strongly squeezed fundamental and second harmonic fields propagating in a $χ^{(2)}$ nonlinear medium effectively evolve under a cubic QND Hamiltonian. We highlight the versatility offered by such Hamiltonian for engineering non-Gaussian quantum states, such as Schrödinger cat states and cubic phase states. We show that our scheme can be highly tolerant against overall detection inefficiency with an auxiliary high-gain phase-sensitive optical amplifier. Our proposal involves parametric interactions in a mesoscopic photon-number regime, significantly enhancing the effective nonlinear coupling from the natïve single-photon coupling rate while providing powerful means to fight photon propagation loss. Experimental numbers suggest that our scheme might be feasible in the near future, particularly with pulsed nonlinear nanophotonics.
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