Title | Observation of the Symmetry-Protected Signature of 3-body Interactions |
Publication Type | Journal Article |
Year of Publication | 2024 |
Authors | Zhukas, LA, Wang, Q, Katz, O, Monroe, C, Marvian, I |
Date Published | 8/202/204 |
Abstract | Identifying and characterizing multi-body interactions in quantum processes remains a significant challenge. This is partly because 2-body interactions can produce an arbitrary time evolution, a fundamental fact often called the universality of 2-local gates in the context of quantum computing. However, when an unknown Hamiltonian respects a U(1) symmetry such as charge or particle number conservation, N-body interactions exhibit a distinct symmetry-protected signature known as the N-body phase, which fewer-body interactions cannot mimic. We develop and demonstrate an efficient technique for the detection of 3-body interactions despite the presence of unknown 2-body interactions. This technique, which takes advantage of GHZ states for phase estimation, requires probing the unitary evolution and measuring its determinant in a small subspace that scales linearly with the system size, making it an efficient approach. |
URL | https://arxiv.org/abs/2408.10475 |