Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Q14: Nuclear Theory
10:45 AM–12:09 PM,
Monday, April 15, 2019
Sheraton
Room: Plaza Court 3
Sponsoring
Unit:
DNP
Chair: Gerald A. Miller, University of Washington
Abstract: Q14.00003 : Efficient Quantum Tomography for Quantum Simulations of Field Theories*
11:09 AM–11:21 AM
View Presentation Abstract
Presenter:
Andrew N Shaw
(University of Maryland, College Park)
Authors:
Andrew N Shaw
(University of Maryland, College Park)
Zohreh Davoudi
(University of Maryland, College Park)
Certain computational problems in physics are estimated to require more computational resources than next-generation Exascale computing hardware will provide. Notable examples are the sign problem in fermionic systems, and real-time dynamics. The sign problem has prevented lattice QCD predictions for properties of dense matter, as well as the evolution of strongly-interacting medium after heavy-ion collisions. Quantum computing has the promise of speeding up certain tasks exponentially. However, modern quantum devices are limited by noise accumulation resulting from the application of imperfect quantum operations, setting a limit on the depth of the circuits that can be implemented. Some of these restrictions could be largely curtailed if scalable quantum tomography algorithms were available. We propose a new algorithm based on quantum interference that allows for quantum tomography of a pure n-qubit state at the cost of an additional n+1 qubits. As a relevant application of this algorithm, we demonstrate how the real-time evolution of few-site 1D QED can be extended far beyond what is possible on current devices. We also find the ground and excited states of the theory with the use of extended adiabatic state preparation enabled by IQT.
*NSF Bridge to the Doctorate Fellowship
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