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Jump-like unravelings for non-Markovian open quantum systems
Jay Gambetta, T. Askerud, H. M. Wiseman
abstract: Non-Markovian evolution of an open quantum system can be `unraveled' into
pure state trajectories generated by a non-Markovian stochastic (diffusive)
Schr\"odinger equation, as introduced by Di\'osi, Gisin, and Strunz. Recently
we have shown that such equations can be derived using the modal (hidden
variable) interpretation of quantum mechanics. In this paper we generalize this
theory to treat jump-like unravelings. To illustrate the jump-like behavior we
consider a simple system: A classically driven (at Rabi frequency $\Omega$)
two-level atom coupled linearly to a three mode optical bath, with a central
frequency equal to the frequency of the atom, $\omega_0$, and the two side
bands have frequencies $\omega_0\pm\Omega$. In the large $\Omega$ limit we
observed that the jump-like behavior is similar to that observed in this system
with a Markovian (broad band) bath. This is expected as in the Markovian limit
the fluorescence spectrum for a strongly driven two level atom takes the form
of a Mollow triplet. However the length of time for which the Markovian-like
behaviour persists depends upon {\em which} jump-like unraveling is used.
- oai_identifier:
- oai:arXiv.org:quant-ph/0401171
- categories:
- quant-ph
- comments:
- 11 pages, 5 figures
- doi:
- 10.1103/PhysRevA.69.052104
- arxiv_id:
- quant-ph/0401171
- journal_ref:
- Phys. Rev. A 69, 052104 (2004)
- created:
- 2004-01-27
- updated:
- 2007-04-06
Full article ▸
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