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Quantum Simulation of Field Theories Without State Preparation

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.

preprint2020arXivOpen access
Siddhartha HarmalkarHenry LammScott Lawrence
hep-latquant-ph
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Siddhartha HarmalkarHenry LammScott Lawrence

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