Decoherence in two Bose-Einstein condensates

Abstract

In this paper, decoherence in a system consisting of two Bose-Einstein condensates is investigated analytically. It is indicated that decoherence can be controlled through manipulating the interaction between the system and environment. The influence of the decoherence on quantum coherent atomic tunneling (AT) between two condensates with arbitrary initial states is studied in detail. Analytic expressions of the population difference (PD) and the AT current between two condensates are found. It is shown that the decoherence leads to the decay of the PD and the suppression of the AT current.

Experimental motivation and empirical consistency in minimal no-collapse quantum mechanics

“…Second, the condensate is described by a single coherent wave function that pertains to a controllable number of atoms and possesses an extremely long coherence time (up to 10-20 s). Third, the sources of decoherence (mostly loss of particles from the condensate) are fairly well-understood and potentially sufficiently controllable through suitable environmental engineering and trap design [87,88,89].…”

Collapses and revivals of exciton emission in a semiconductor microcavity: Detuning and phase-space filling effects

“…In some Refs. [25,26], the authors calculated dynamics of a twocomponent Bose-Einstein condensate system by using the so called rotating-wave approximation (RWA). Physically, the essence of RWA is the same with the secular approximation, which is valid in the regime of weakly nonlinearity [24,19], i.e., A, B ≪ g.…”

“…Within these two systems mentioned above, linear interaction between the matter field and the light field plays a prominent role for the appearance of the CRs. The creations of CRs in nonlinear systems, such as the nonlinear directional coupler [33], the relative phase between two superfluids or superconductors [34], and the population imbalance of a two-mode BoseEinstein condensate [35][36][37][38]25,26] have been also studied. Here in our paper, the emission of the high-density excitons in a quantum well embedded in a single-mode cavity is also found to exhibit CRs due to nonlinear interaction between the excitons.…”

Influence of Intrinsic Decoherence on Nonclassical Properties of the Output of a Bose–einstein Condensate

“…On the other hand, there has been increased interest in the problem about decoherence of BEC and atom laser [16][17][18][19]. One fact causing decoherence comes from the nonlinear interaction between atoms.…”

“…In Ref. [19], the influence of the decoherence on quantum coherent atomic tunneling between two condensates is studied. It is shown that the decoherence leads to the decay of the population difference and the suppression of the coherent atomic tunneling.…”