Refereed journal article or data article (A1)

Continuous quantum measurement for general Gaussian unravelings can exist




List of Authors: Megier N, Strunz WT, Luoma K

Publisher: AMER PHYSICAL SOC

Publication year: 2020

Journal: Physical Review Research

Journal name in source: PHYSICAL REVIEW RESEARCH

Journal acronym: PHYS REV RES

Volume number: 2

Number of pages: 8

DOI: http://dx.doi.org/10.1103/PhysRevResearch.2.043376


Abstract
Quantum measurements and the associated state changes are properly described in the language of instruments. We investigate the properties of a time continuous family of instruments associated with the recently introduced class of general Gaussian non-Markovian stochastic Schrodinger equations. In this article we find that when the covariance matrix for the Gaussian noise satisfies a particular delta-function constraint, the measurement interpretation is possible for a class of models with self-adjoint coupling operator. This class contains, for example the spin-boson and quantum Brownian motion models with colored bath correlation functions. Remarkably, due to quantum memory effects the reduced state, in general, does not obey a closed form master equation while the unraveling has a time continuous measurement interpretation.


Last updated on 2022-17-01 at 11:18