Coherence and entanglement dynamics of vibrating qubits

Abstract

We investigate the dynamics of coherence and entanglement of vibrating qubits. Firstly, we consider a single trapped ion qubit inside a perfect cavity and successively we use it to construct a bipartite system made of two of such subsystems, taken identical and noninteracting. As a general result, we find that qubit vibration can lead to prolonging initial coherence in both single-qubit and two-qubit system. However, despite of this coherence preservation, we show that the decay of the entanglement between the two qubits is sped up by the vibrational motion of the qubits. Furthermore, we highlight how the dynamics of photon-phonon correlations between cavity mode and vibrational mode, which may serve as a further useful resource stored in the single-qubit system, is strongly affected by the initial state of the qubit. These results provide new insights about the ability of systems made of moving qubits in maintaining quantum resources compared to systems of stationary qubits.

arXiv comment7 pages, 5 figures. Prepared for the Virtual Special Issue (VSI) on Quantum Correlations, in the journal Optics Communications)

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• Entanglement dynamics of an arbitrary number of moving qubits in a common environment
• Searching for exceptional points and inspecting non-contractivity of trace distance in (anti-)$\mathcal{P}\mathcal{T}-$symmetric systems
• Qubit Movement-Assisted Entanglement Swapping
• Decoupling of External and Internal Dynamics in Driven Two-level Systems
• Vibration-Assisted Multi-Photon Resonance and Multi-Ion Excitation
• Quantum enhancement of qutrit dynamics through driving field and photonic band-gap crystal
• Controlling Quantum Coherence of V-type Atom in Dissipative Cavity by Detuning and Weak Measurement Reversal