New Physical Review Journal PRX-Quantum Publishes Wyant College Paper in First Issue

    Date Posted: 
    Tuesday, November 3, 2020

    Wyant College Professor Poul Jessen with collaborators at University of New Mexico are among the first papers published by the brand new Physical Review Journal PRX-Quantum. The journal "is the first open-access, highly selective topical journal in the Physical Review portfolio, published by the American Physical Society (APS)." The article, "Quantifying the Sensitivity to Errors in Analog Quantum Simulation" is authored by Pablo M. Poggi, Nathan K. Lysne, Kevin W. Kuper, Ivan H. Deutsch, and Poul S. Jessen.

    Learn more about this paper from the authors, below:

    Legendary physicist Richard Feynman envisioned quantum computers simulating quantum mechanics itself. Today, one of the most exciting prospects of near-term quantum technologies is to enable simulation of complex systems such as exotic superconducting materials, large molecules for pharmaceutical discovery, or high-energy particle physics. Quantum simulators are devices that are designed to serve this special purpose, and are thus expected to work with less-stringent requirements than those needed for universal error-corrected digital quantum computers. However, quantum simulators are intrinsically analog computers, subjected to a continuum of errors. Can we trust the output of a noisy analog quantum simulator?  It is essential to understand how errors affect the performance and reliability of these devices.

    In our work, we focus on analyzing how the unavoidable imperfections that are present in any real-world device affect our ability to reliably extract information about a system. We do this first by proposing a theoretical model of random perturbations to the quantum system, from which we are able to establish a quantitative characterization of simulation outputs in terms of robust and fragile observables. Then, we run experiments on a state-of-the-art quantum simulator based on quantum control of atomic spins, and show that the predictions of our framework are indeed observed in a real-world device without assuming any knowledge of the experimental imperfections. We expect that our theoretical framework can find applications not only in other quantum information processing platforms, but also to tackle other problems related to quantum tomography and equilibration in closed quantum systems.