论文标题
具有负Wigner功能的确定性自由传播光子量子
Deterministic Free-Propagating Photonic Qubits with Negative Wigner Functions
论文作者
论文摘要
自由传播光的工程量子状态对于量子技术至关重要。连贯的状态在经典和量子通信中无处不在，在量子传感中使用的挤压状态，甚至在量子计算的背景下研究的高度输入的聚类状态可以确定性地产生，但是它们遵守高斯式的Quussian Quassi-Classical光学统计量，由高斯式的正wigner函数，正面的Wigner函数。充分利用许多量子工程协议的潜力需要使用非高斯wigner阴性状态，迄今使用本质上概率的方法生产。在这里，我们描述了非高斯维格尼（Wigner）阴性的自由传播状态的第一个完全确定性的制备，该状态是通过将腔内rydberg superatom的内部状态映射到编码为0和1光子的叠加的光学Qubit上而获得的。这种方法使我们能够在控制良好的时空模式下达到60％的光子产生效率，同时保持强烈的光子抗抗激素。通过更改量子旋转角，我们观察到从正交挤压到Wigner负性的演变。我们的实验将这种新技术设置为一种可行的方法，可以确定性地生成非高斯光子资源，从而在光学量子工程中提升了几个主要的障碍。
Engineering quantum states of free-propagating light is of paramount importance for quantum technologies. Coherent states ubiquitous in classical and quantum communications, squeezed states used in quantum sensing, and even highly-entangled cluster states studied in the context of quantum computing can be produced deterministically, but they obey quasi-classical optical field statistics described by Gaussian, positive Wigner functions. Fully harnessing the potential of many quantum engineering protocols requires using non-Gaussian Wigner-negative states, so far produced using intrinsically probabilistic methods. Here we describe the first fully deterministic preparation of non-Gaussian Wigner-negative free-propagating states of light, obtained by mapping the internal state of an intracavity Rydberg superatom onto an optical qubit encoded as a superposition of 0 and 1 photons. This approach allows us to reach a 60% photon generation efficiency in a well-controlled spatio-temporal mode, while maintaining a strong photon antibunching. By changing the qubit rotation angle, we observe an evolution from quadrature squeezing to Wigner negativity. Our experiment sets this new technique as a viable method to deterministically generate non-Gaussian photonic resources, lifting several major roadblocks in optical quantum engineering.
