3 papers
quant-ph2026
Pre-Asymptotic Trainability in Photonic Variational Circuits under Postselection
Yichen Xie, Cassandre Notton, Jean Senellart
Barren plateaus (BP) in variational quantum circuits are commonly attributed to strong mixing dynamics that cause gradient variance to vanish exponentially with system size. Passiv…
quant-ph2025
Efficient Gaussian State Preparation in Quantum Circuits
Yichen Xie, Nadav Ben-Ami
Gaussian states hold a fundamental place in quantum mechanics, quantum information, and quantum computing. Many subfields, including quantum simulation of continuous-variable syste…
quant-ph2025
Quantum Surrogate-Driven Image Classifier: A Gradient-Free Approach to Avoid Barren Plateaus
Yichen Xie
Training deep quantum neural networks (QNNs) for image classification is notoriously difficult due to vanishing gradients (barren plateaus) and limited nonlinearity in purely unita…