Journal
APPLIED SCIENCES-BASEL
Volume 8, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/app8091427
Keywords
cavity QED; polariton condensates; open quantum systems; quantum trajectories; numerical simulation; Hartree-Fock-Bogoliubov; truncated Wigner
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Funding
- FWO Odysseus program
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We construct a class of variational methods for the study of open quantum systems based on Gaussian ansatzes for the quantum trajectory formalism. Gaussianity in the conjugate position and momentum quadratures is distinguished from Gaussianity in density and phase. We apply these methods to a driven-dissipative Kerr cavity where we study dephasing and the stationary states throughout the bistability regime. Computational cost proves to be similar to the Truncated Wigner Approximation (TWA) method, with at most quadratic scaling in system size. Meanwhile, strong correspondence with the numerically-exact trajectory description is maintained so that these methods contain more information on the ensemble constitution than TWA and can be more robust.
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