Related papers: Engineering biphoton spectral wavefunction in a silicon micro-ring resonator with split resonances

Engineering biphoton spectral wavefunction in a silicon micro-ring resonator with split resonances

URL: http://arxiv.org/abs/2408.13590v1
Date: Sat, 24 Aug 2024 14:23:21 GMT
Title: Engineering biphoton spectral wavefunction in a silicon micro-ring resonator with split resonances
Authors: Liao Ye, Haoran Ma, Xiaoqing Guo, Fanjie Ruan, Yuehai Wang, Jianyi Yang,
Abstract summary: Control of frequency-time amplitude of a photon's electric field has been demonstrated on platforms with second-order optical nonlinearity. Here, we demonstrate a cavity-enhanced photon-pair source that can generate both separable states and controllable entangled states. Experiments and simulations demonstrate the capacity to manipulate the frequency-domain wavefunction in a silicon-based device.
Score: 21.14676162428423
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Frequency-time is a degree of freedom suitable for photonic high-dimensional entanglement, with advantages such as compatibility with single-mode devices and insensitivity to dispersion. The engineering control of the frequency-time amplitude of a photon's electric field has been demonstrated on platforms with second-order optical nonlinearity. For integrated photonic platforms with only third-order optical nonlinearity, the engineered generation of the state remains unexplored. Here, we demonstrate a cavity-enhanced photon-pair source on the silicon-on-insulator (SOI) platform that can generate both separable states and controllable entangled states in the frequency domain without post-manipulation. By choosing different resonance combinations and employing on-chip optical field differentiation, we achieve independent control over two functions that affect the joint spectral intensity (JSI) of the state. A semi-analytical model is derived to simulate the biphoton spectral wavefunction in the presence of resonance splitting and pump differentiation, and its parameters can be fully determined through fitting-based parameter extraction from the resonator's measured linear response. The measured spectral purity for the separable state is $95.5\pm 1.2\%$, while the measured JSIs for the entangled states show two- or four-peaked functions in two-dimensional frequency space. The experiments and simulations demonstrate the capacity to manipulate the frequency-domain wavefunction in a silicon-based device, which is promising for applications like quantum information processing using pulsed temporal-mode encoding or long-distance quantum key distribution.

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