利用连续波低损耗波导光参量放大器产生具有维格纳负性的薛定谔猫态
Generation of Schrödinger cat states with Wigner negativity using continuous-wave low-loss waveguide optical parametric amplifier
摘要：
连续波压缩光可以产生各种光学量子态，是利用光学连续变量进行容错普适量子计算的基础资源。为了实现实用的量子计算机，波导光参量放大器（OPA）由于其太赫兹级带宽和适合模块化而成为一种有吸引力的连续压缩光源。然而，由于很难产生高纯度的压缩光，因此迄今为止波导OPA在量子应用中的使用受到限制。在本文中，我们报告的第一个观察到的Wigner负的状态产生的先驱方法使用波导OPA。我们利用自行研制的准单模ZnO掺杂周期极化${\rm LiNbO_3}$波导模块，在波长为1545 nm处产生了具有Wigner负性的薛定谔猫态。Wigner负性是衡量量子态有效性的重要指标，它在容错的通用量子计算中是必不可少的。我们的结果表明，我们的波导OPA可以用于广泛的量子应用，导致太赫兹时钟光量子计算机。
英文摘要：
Continuous-wave (CW) squeezed light is used in generation of various optical quantum states thus is a fundamental resource of fault-tolerant universal quantum computation using optical continuous variables. To realize a practical quantum computer, a waveguide optical parametric amplifier (OPA) is an attractive CW squeezed light source in terms of its THz-order bandwidth and suitability for modularization. The usages of a waveguide OPA in quantum applications thus far, however, are limited due to the difficulty of the generation of the squeezed light with a high purity. In this paper, we report the first observation of Wigner negativity of the states generated by a heralding method using a waveguide OPA. We generate Schrödinger cat states at the wavelength of 1545 nm with Wigner negativity using a quasi-single-mode ZnO-doped periodically poled ${\rm LiNbO_3}$ waveguide module we developed. Wigner negativity is regarded as an important indicator of the usefulness of the quantum states as it is essential in the fault-tolerant universal quantum computation. Our result shows that our waveguide OPA can be used in wide range of quantum applications leading to a THz-clock optical quantum computer.
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