aqora

Coherent dynamics of a qubit–oscillator system in a noisy environment

Wei Wu, Jun-Qing Cheng

arXiv:1712.09486Quantum Information ProcessingSep 26, 201810 citations

Exact coherence dynamics mediated by a small environment

Wenchong Shu, Ting Yu

We study the non-equilibrium entanglement dynamics of a qubit system coupled to a small environment consisting of only two harmonic oscillators. We report several analytic and numerical results related to the modulated concurrence dynamics of two-qubit systems via correlated environmental modes. In particular, we show that the correlation between the two components of the environment can serve as an enhancer for either fast decay or fast generation of the two-qubit entanglement.

Journal of Physics B Atomic Molecular and Optical PhysicsOct 25, 20117 citations

Dynamics of a Qubit Coupled to a Harmonic Oscillator

Patrice Bertet, I. Chiorescu, Kouichi Semba +2 more

Springer eBooksMay 29, 20060 citations

Reversible and irreversible dynamics of a qubit interacting with a small environment

Giuliano Benenti, G. Massimo Palma

We analyze the dynamics of a system qubit interacting by means of a sequence of pairwise collisions with an environment consisting of just two qubits. We show that the density operator of the qubits approaches a common time-averaged equilibrium state, characterized by large fluctuations, only for a random sequence of collisions. For a regular sequence of collisions the qubit states of the system and of the reservoir undergo instantaneous periodic oscillations and do not relax to a common state. Furthermore we show that pure bipartite entanglement is developed only when at least two qubits are initially in the same pure state while otherwise also genuine multipartite entanglement builds up.We analyze the dynamics of a system qubit interacting by means of a sequence of pairwise collisions with an environment consisting of just two qubits. We show that the density operator of the qubits approaches a common time-averaged equilibrium state, characterized by large fluctuations, only for a random sequence of collisions. For a regular sequence of collisions the qubit states of the system and of the reservoir undergo instantaneous periodic oscillations and do not relax to a common state. Furthermore we show that pure bipartite entanglement is developed only when at least two qubits are initially in the same pure state while otherwise also genuine multipartite entanglement builds up.

arXiv:quant-ph/0611262Physical Review AMay 21, 200732 citations

Driven dynamics of a qubit tunably coupled to a harmonic oscillator

Simon Gustavsson, Jonas Bylander, Fei Yan +10 more

Bulletin of the American Physical SocietyFeb 29, 20120 citations

Dissipation of the Rabi model beyond the Jaynes–Cummings approximation: quasi-degenerate qubit and ultra-strong coupling

Shantanu Agarwal, Seyed Mohammad Hashemi Rafsanjani, Joseph H. Eberly

Environmental influences on the dynamics of a coupled qubit-oscillator system are studied analytically in a regime where deviations from the exactly solvable Jaynes–Cummings model are important. We investigate the case of a quasi-degenerate qubit within the ultra-strong coupling regime for which the qubit frequency is much smaller than the frequency of the oscillator, and the coupling between the qubit and the oscillator is large, both of which invalidate the usually employed rotating wave approximation. In contrast to the standard quantum optics master equation, we explicitly take the qubit-oscillator coupling into account while microscopically deriving a dressed state master equation. Using the derived master equation, we discuss a spectroscopic technique which can be used to probe the dressed energy-level structure of the qubit-oscillator system.Environmental influences on the dynamics of a coupled qubit-oscillator system are studied analytically in a regime where deviations from the exactly solvable Jaynes–Cummings model are important. We investigate the case of a quasi-degenerate qubit within the ultra-strong coupling regime for which the qubit frequency is much smaller than the frequency of the oscillator, and the coupling between the qubit and the oscillator is large, both of which invalidate the usually employed rotating wave approximation. In contrast to the standard quantum optics master equation, we explicitly take the qubit-oscillator coupling into account while microscopically deriving a dressed state master equation. Using the derived master equation, we discuss a spectroscopic technique which can be used to probe the dressed energy-level structure of the qubit-oscillator system.

arXiv:1304.5308Journal of Physics B Atomic Molecular and Optical PhysicsNov 7, 201313 citations

Deviations from reversible dynamics in a qubit–oscillator system coupled to a very small environment

Related papers

Deviations from reversible dynamics in a qubit–oscillator system coupled to a very small environment

Related papers