This paper studies decoherence without dissipation of charged magneto-oscillator in the framework of quantum non-demolition type interaction in non-commutative phase-space. The master equation is derived considering the non-commutativity effects of a bath of harmonic oscillators to study the dynamics of such a system, and its possible exact solution is presented. By analyzing this solution, it turns out that the process involving decoherence without energy dissipation can be observed explicitly. In addition, the decoherence factor and the measure of coherence via linear entropy dynamic are deduced for two types of reservoir, namely the ohmic and super-ohmic reservoirs at low and high temperature limits. Numerical results obtained show that the coherence is better preserved in the system when non-commutativity effects are taken into account at low temperature, while the inverse phenomenon is observed at high temperature. Moreover, by kindly adjusting the non-commutative parameters, it is possible to improve the coherence time scale of the system. Another interesting result can be observed from the system’s coherence time scale, which is very sensitive to the magnetic field and thus adding to non-commutative parameters, it may be useful to control decoherence in the system.

In the present paper, we study the influence of non-commutativity on entanglement in a system of two oscillators-modes in interaction with its environment. The considered system is a two-dimensional harmonic oscillator in non-commuting spatial coordinates coupled to its environment. The dynamics of the covariance matrix, the separability criteria for two Gaussian states in non-commutative space coordinates, and the logarithmic negativity are used to evaluate the quantum entanglement in the system, which is compared to the commutative space coordinates case. The result is applied for two initially entangled states, namely the squeezed vacuum and squeezed thermal states. It can be observed that the phenomenon of entanglement sudden death appears more early in the system for the case of squeezed vacuum state than in the case of squeezed thermal state. Thereafter, it is also observed that non-commutativity effects lead to an increasing of entanglement of initially entangled quantum states, and reduce the separability in the open quantum system. It turns out that a separable state in the usual commutative quantum mechanics might be entangled in non-commutative extension.

In this paper, the influence of non-commutativity on quantum systems interacting with the environment in the Penning trap potential is studied. The considered system is a Brownian particle expressed in non-commuting spatial coordinates coupled to a set of harmonic oscillators (environment). The equilibrium state of the total system has been evaluated using the fluctuation dissipation theorem. The effective parameters of the system are evaluated and compared with those of the system in commutative space. We found that non-commutativity effects give rise to an increase in decoherence in the system, and negative heat capacity confirms the presence of self-gravitation effects induced by non-commutativity. and plays an essential role in physics at the Planck's scale where quantum effects of the gravity might not be negligible [7]. Although NCity embodies a puzzle piece in high-energy scenario, great interest has also been addressed to its implications in condensed matter physics though the four fundamental interactions. Thus, the studies proved that there is a trace of NCity in the hydrogen atom [8][9][10], quantum Hall effect [11][12][13], Ahoronov-Bohm effect [14,15], graphene [16] and even in quantum information theory [17]. In the latter, several examples have been proposed and among them, we denote the phenomenon of decoherence. Quantum decoherence is considered to be a fundamental physical base for the transition from quantum to classical physics [18]. This phenomenon was first considered in 70ʼs and 80ʼs with the works of Zeh (1950) and Zureck (1991) on the emergence of classicality in the quantum framework [19,20]. Moreover, this phenomenon presents a profound implication in very high energy universe, where important applications correspond to supplying a mechanism in which the end of inflationary phase, enters smoothly to the radiation era [20][21][22][23][24]. Recently, Derakhshani suggests that, quantum decoherence concept can be sensibly applied to quantum gravity theories that posit classical time parameters or matter-clock variables at a fundamental level [25]. It will be therefore, very interesting to investigate this phenomenon of decoherence considering the space as NC. Whereas, it is important to mention that, before exploring the properties of particle in quantum physics, it is often necessary to trap the particle with a convenient potential. The harmonic potential and double well potential have already been used in several works in the study of the phenomenon of decoherence [26,27]. However, in this work, we trapped the Brownian particle in a Penning potential since its structure presents the advantage of combining the superposition of electric and magnetic field.Recently, with the new development in the physics of quantum open systems, Dragovich et al in 2005 investigated the influence of NCity on the occurrence of the so-called decoherence effect with external magnetic field, and they found that, decoherence can be highly affected when the external control (magnetic field) is constrained by the N...