Tootfinder

Access Control Threatened by Quantum Entanglement
Zhicheng Zhang, Mingsheng Ying
https://arxiv.org/abs/2507.02622 https://arxiv.org/p…

Access Control Threatened by Quantum Entanglement
Access control is a cornerstone of computer security that prevents unauthorised access to resources. In this paper, we study access control in quantum computer systems. We present the first explicit scenario of a security breach when a classically secure access control system is straightforwardly adapted to the quantum setting. The breach is ultimately due to that quantum mechanics allows the phenomenon of entanglement and violates Mermin inequality, a multi-party variant of the celebrated Bell…

Spinon Singlet: Microscopic Mechanism of $d$-Wave Pairing in a Partially-Filled Stripe
Jia-Long Wang, Shi-Jie Hu, Xue-Feng Zhang
https://arxiv.org/abs/2507.18892 https://…

Spinon Singlet: Microscopic Mechanism of $d$-Wave Pairing in a Partially-Filled Stripe
Significant research advances have led to a consensus that the Fermi-Hubbard model and its extended variants are archetypal frameworks for elucidating the intertwined relationship between stripe orders and superconductivity in hole-doped high-$T_c$ materials. Notably, the Hubbard quantum simulator has recently achieved several remarkable breakthroughs, e.g., being successfully cooled down to the cryogenic regime and enabling the observation of stable fluctuating stripes. However, the microscopi…

Quantifying mixed-state entanglement via partial transpose and realignment moments
Poetri Sonya Tarabunga, Tobias Haug
https://arxiv.org/abs/2507.13840 htt…

Quantifying mixed-state entanglement via partial transpose and realignment moments
Entanglement plays a crucial role in quantum information science and many-body physics, yet quantifying it in mixed quantum many-body systems has remained a notoriously difficult problem. Here, we introduce families of quantitative entanglement witnesses, constructed from partial transpose and realignment moments, which provide rigorous bounds on entanglement monotones. Our witnesses can be efficiently measured using SWAP tests or variants of Bell measurements, thus making them directly impleme…