Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session F28: Quantum Computing with Open Quantum Systems
11:15 AM–2:03 PM,
Tuesday, March 5, 2019
BCEC
Room: 161
Sponsoring
Unit:
DQI
Chair: Camille Lombard Latune, University of KwaZulu-Natal
Abstract: F28.00007 : Consequences of measurement back-action from quantum monitoring: non-standard speed limits and spontaneous symmetry breaking*
12:27 PM–12:39 PM
Presenter:
Luis Pedro Garcia-Pintos
(university of massachusetts boston)
Authors:
Luis Pedro Garcia-Pintos
(university of massachusetts boston)
Diego Tielas
(Universidad de la Plata)
Adolfo del Campo
(university of massachusetts boston)
For the problem of the speed of evolution, we show that that there are trajectories for which standard quantum speed limits are violated, and determine the dispersion of the speed of evolution in an ensemble of realizations of continuous measurement records. Regarding the problem of spontaneous symmetry breaking, which is typically understood as a consequence of random uctuations either in the Hamiltonian governing the evolution or in the state of the system, we present a novel alternative mechanism, induced by the measurement back-action. We show that, depending on the nature of the quantum monitoring, an observer can alter the topology and the pattern of symmetry breaking.
*John Templeton Foundation, UMass Boston, CONICET Argentina.
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