Quantum digital cooling in NISQ devices

Presenting Author: Jaimie S. Stephens, Sandia National Laboratories
Contributing Author(s): Kevin Young; Robin Blume-Kohout; Craig W. Hogle; Peter Maunz; Susan Clark

Quantum Digital Cooling (QDC) is a method of preparing the ground state of a Hamiltonian proposed by Polla \textit{et. al.} 2019. In QDC, the system is coupled to a single ancila qubit which is referred to as the fridge qubit. The fridge qubit is cooled to then indirectly cool the system down to the ground state. This technique mitigates errors via cooling rather than relying on fault-tolerant quantum computing. This makes it a good candidate for NISQ devices. We look at the performance of QDC when we add a noise. We look at two error models in particular. The first is iid Pauli errors caused by the environment reheating the system. The second is cross talk from operating on the fridge qubit. We experimentally demonstrate our theoretical predictions on trapped ions. Sandia National Labs is managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a subsidiary of Honeywell International, Inc., for the U.S. DOE’s National Nuclear Security Administration under contract DE-NA0003525.

(Session 5 : Saturday from 5:00pm - 7:00pm)


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