title: Quantum simulation. Coherent imaging spectroscopy of a quantum many-body spin system.
abstract: Quantum simulators, in which well-controlled quantum systems are used to reproduce the dynamics of less understood ones, have the potential to explore physics inaccessible to modeling with classical computers. However, checking the results of such simulations also becomes classically intractable as system sizes increase. Here, we introduce and implement a coherent imaging spectroscopic technique, akin to magnetic resonance imaging, to validate a quantum simulation. We use this method to determine the energy levels and interaction strengths of a fully connected quantum many-body system. Additionally, we directly measure the critical energy gap near a quantum phase transition. We expect this general technique to become a verification tool for quantum simulators once experiments advance beyond proof-of-principle demonstrations and exceed the resources of conventional computers.
authors: Joint Quantum Institute, University of Maryland, Department of Physics, and National Institute of Standards and Technology, College Park, MD 20742, USA. csenko@umd.edu.
authors: C
authors: C
authors: Senko
authors: Joint Quantum Institute, University of Maryland, Department of Physics, and National Institute of Standards and Technology, College Park, MD 20742, USA.
authors: J
authors: J
authors: Smith
authors: Joint Quantum Institute, University of Maryland, Department of Physics, and National Institute of Standards and Technology, College Park, MD 20742, USA.
authors: P
authors: P
authors: Richerme
authors: Joint Quantum Institute, University of Maryland, Department of Physics, and National Institute of Standards and Technology, College Park, MD 20742, USA.
authors: A
authors: A
authors: Lee
authors: Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA.
authors: W C
authors: WC
authors: Campbell
authors: Joint Quantum Institute, University of Maryland, Department of Physics, and National Institute of Standards and Technology, College Park, MD 20742, USA.
authors: C
authors: C
authors: Monroe