Effective Particles in Quantum Spin Chains: Applications

Laurens Vanderstraeten

Federico Raffaele De Filippi, Antonio Francesco Mello, Daniel Sacco Shaikh +3 more

Spin 1/2 quantum spin chains represent the prototypical model for coupled two-level systems. Consequently, they offer a fertile playground for both fundamental and technological applications ranging from the theory of thermalization to quantum computation. Recently, it has been shown that interesting phenomena are associated to the boundary conditions imposed on the quantum spin chains via the so-called topological frustration. In this work, we analyze the effects of such frustration on a few-spin system, with a particular focus on the strong even–odd effects induced in the ground-state energy. We then implement a topologically frustrated quantum spin chain on a quantum computer to show that our predictions are visible on current quantum hardware platforms.

A. Zheludev

Jill C. Bonner, Henk W. J. Blöte, Hans Beck +1 more

Ning Sun, Lei Feng, Pengfei Zhang

The Efimov effect is a quantum phenomenon in which three particles form an infinite series of low-energy bound states at resonance, previously observed in three-dimensional systems. The authors extend this celebrated effect to long-range quantum spin systems, demonstrating long-range spin chains can also host Efimov states with widely tunable scaling ratios controlled by the interaction range.

Kenn Kubo