Quantum randomness emerging under gravitational nonlinearity

Quantum Random Number Generation using a Solid-State Single-Photon Source

Quantum random number generation (QRNG) harnesses the intrinsic randomness of quantum mechanical phenomena. Demonstrations of such processes have, however, been limited to probabilistic sources, for instance, spontaneous parametric down-conversion or faint lasers, which cannot be triggered deterministically. Here, we demonstrate QRNG with a quantum emitter in hexagonal boron nitride; an emerging solid-state quantum source that can generate single photons on demand and operates at room temperature. We achieve true random number generation through the measurement of single photons exiting one of…

Complex chaos in the conditional dynamics of qubits

We analyze the consequences of iterative measurement-induced nonlinearity on the dynamical behavior of qubits. We present a one-qubit scheme where the equation governing the time evolution is a complex-valued nonlinear map with one complex parameter. In contrast to the usual notion of quantum chaos, exponential sensitivity to the initial state occurs here. We calculate analytically the Lyapunov exponent based on the overlap of quantum states, and find that it is positive. We present a few illustrative examples of the emerging dynamics.

混合量子系统中基于磁振子非线性的宽带相干微波转换

Wideband Coherent Microwave Conversion via Magnon Nonlinearity in Hybrid Quantum System

本文提出在金刚石氮-空位中心与CoFeB磁性薄膜构成的混合量子系统中，利用磁振子非线性实现0.1至12 GHz宽带微波频率转换，最高达第25阶，并展示其在频率检测和量子比特相干控制中的应用。

Experimental Quantum-enhanced Cryptographic Remote Control

The Internet of Things (IoT), as a cutting-edge integrated cross-technology, promises to informationize people's daily lives, while being threatened by continuous challenges of eavesdropping and tampering. The emerging quantum cryptography, harnessing the random nature of quantum mechanics, may also enable unconditionally secure control network, beyond the applications in secure communications. Here, we present a quantum-enhanced cryptographic remote control scheme that combines quantum randomness and one-time pad algorithm for delivering commands remotely. We experimentally demonstrate this o…

视角：非厄运物理中的相互作用与非线性

Perspective: Interactions and Nonlinearity in Non-Hermitian Physics

本文探讨非厄运物理从单粒子线性模型到多体相互作用系统的演变，分析非厄运动力学的物理起源，讨论相互作用诱导的拓扑相、非线性 regime 中的集体现象及测量诱导纠缠相变。

Tunable Photon blockade with single atom in a cavity under electromagnetically induced transparency

We present an experimental proposal to achieve a strong photon blockade by employing electromagnetically induced transparency (EIT) with single alkaline-earth-metal atom trapped in an optical cavity. In the presence of optical Stark shift, both second-order correlation function and cavity transmission exhibit asymmetric structures between the red and blue sidebands of the cavity. For a weak control field, the photon quantum statistics for the coherent transparency window (i.e. atomic quasi-dark state resonance) are insensitive to the Stark shift, which should also be immune to the spontaneous …

Realistic quantum photonic neural networks

Quantum photonic neural networks are variational photonic circuits that can be trained to implement high-fidelity quantum operations. However, work-to-date has assumed idealized components, including a perfect $π$ Kerr nonlinearity. Here, we investigate the limitations of realistic quantum photonic neural networks that suffer from fabrication imperfections leading to photon loss and imperfect routing, and weak nonlinearities, showing that they can learn to overcome most of these errors. Using the example of a Bell-state analyzer, we demonstrate that there is an optimal network size, which bala…

基于Carleman线性化Boltzmann方法的非线性一维流体显式量子电路模拟

Explicit Quantum Circuit Simulation of Nonlinear 1-Dimensional Fluid with Carleman-linearized Boltzmann Method

通过二阶Carleman线性化处理一维Boltzmann方程的非线性项，结合量子奇异值变换的泰勒展开ODE求解器，实现了显式量子电路模拟，分析了门和量子比特复杂度随网格大小的对数缩放。

反铁磁子在量子领域的压缩

Magnon squeezing in the quantum regime

研究通过在毫米级钇铁石榴石球中实现反铁磁子压缩，利用强色散反铁磁子-超导量子比特耦合产生压缩反铁磁子态，展示了量子非线性反铁磁子学的基础。