Two coupled qubits under the influence of a minimal, phase-sensitive environment

Abstract

In this work, we investigate the influence of a minimal, phase-sensitive environment on a system of two coupled qubits. The environment is constituted by a single-mode field initially prepared in a type of Schrödinger cat state, a quantum superposition of two squeezed coherent states. We present an analytical solution to the model and investigate the degradation of the quantum features of the system due to the action of the environment. In particular, we find that the time-averaged linear entropy for long times, ${\bar{S}}_T$, has approximately a linear dependence on Mandel's $Q$ parameter as well as on the variance of the $\hat{X}$ quadrature of the initial state of the environment.

arXiv comment14 pages, 13 figures. This version contains an additional section about the dynamics of quantum coherence

References in corpus (20)

• Quantum entanglement
• Entanglement of a Pair of Quantum Bits
• Finite-Time Disentanglement via Spontaneous Emission
• Dynamics of quantum entanglement
• Specific heat anomalies of open quantum systems
• Rabi oscillations in a qubit coupled to a quantum two-level system
• Journeys from Quantum Optics to Quantum Technology
• Landau-Zener transitions in a two-level system coupled to a finite-temperature harmonic oscillator
• Two coupled qubits interacting with a thermal bath: A comparative study of different models
• Is the decoherence of a system the result of its interaction with the environment?
• Entanglement dynamics and relaxation in a few qubit system interacting with random collisions
• Catalytic quantum randomness
• Quantum chaos, equilibration and control in extremely short spin chains
• Decoherence dynamics of a qubit coupled to a quantum two-level system
• Sudden death of entanglement induced by a minimal thermal environment
• Dephasing of qubits by the Schrödinger cat
• A simple model for a minimal environment: the two-atom Tavis-Cummings model revisited
• Deviations from reversible dynamics in a qubit-oscillator system coupled to a very small environment
• Evolution of a quantum harmonic oscillator coupled to a minimal thermal environment
• Dynamics of two atoms coupled to a cavity field