Quantum Simulation of Field Theories Without State Preparation

• URL: http://arxiv.org/abs/2001.11490v1
• Date: Thu, 30 Jan 2020 18:23:23 GMT
• Title: Quantum Simulation of Field Theories Without State Preparation
• Authors: Siddhartha Harmalkar, Henry Lamm, Scott Lawrence
• Abstract summary: We propose an algorithm for computing real-time observables using a quantum processor while avoiding the need to prepare the full quantum state. This reduction in quantum resources is achieved by classically sampling configurations in imaginary-time using standard lattice field theory.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: We propose an algorithm for computing real-time observables using a quantum processor while avoiding the need to prepare the full quantum state. This reduction in quantum resources is achieved by classically sampling configurations in imaginary-time using standard lattice field theory. These configurations can then be passed to quantum processor for time-evolution. This method encounters a signal-to-noise problem which we characterize, and we demonstrate the application of standard lattice QCD methods to mitigate it.

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